The final temperature of the system is 32.4 °C.
heat lost by Pb + heat gained by water = 0
[tex]q_{1} +q_{2} = 0[/tex]
[tex]m_{1}C_{1}\Delta T_{1} + m_{2}C_{2}\Delta T_{2} = 0[/tex]
[tex]q_{1}= m_{1}C_{1}\Delta T_{1} = 21.2 \:\text{g}\times 0.128\: \text{J}^{\circ}\text{C}^{-1}\text{g}\times (T_{f} -113\: ^{\circ}\text{C}) = 2.713T_{f}\: \text{J}^{\circ}\text{C}^{-1}\: -\: 306.6\:\text{J}\cdot\text{g}^{-1}\\[/tex]
[tex]q_{2}= m_{2}C_{2}\Delta T_{2} = 14.8 \:\text{g}\times 4.184\: \text{J}\cdot^{\circ}\text{C}^{-1}\text{g}^{-1}\times (T_{f} -28.9\: ^{\circ}\text{C}) = 61.9\: \Delta T_{f} \: \text{J}^{\circ}\text{C} \:- 1790 \: \text{J}\\[/tex]
Adding [tex]q_{1}[/tex] and [tex]q_{2}[/tex] and combinibg like terms, we get
[tex]168.0\text{T}_{f}\: ^{\circ}\text{C} ^{-1}\:- 2096 = 0]\\[/tex]
[tex]T_{f} = \frac{2096}{68.0 \: ^{\circ}\text{C}^{-1}} = 32.4 ^{\circ}\text{C}\\[/tex]
You have a cup of water and a packet of powdered juice mix. You add some of the juice mix to the cup of water and stir. The powder dissolves completely. You decide to add more juice mix to the cup and stir again. This time chunks of powder are floating on the surface of the water. What can you conclude about the solution?
How does the density of air affect its movement in a convection cell?
a convection cell is the phenomenon that occurs when density differences exist within a body of liquid or gas. These density differences result in rising and/or falling currents, which are the key characteristics of a convection cell. When a volume of fluid is heated, it expands and becomes less dense and thus more buoyant than the surrounding fluid. The colder, denser part of the fluid descends to settle below the warmer, less-dense fluid, and this causes the warmer fluid to rise. Such movement is called convection, and the moving body of liquid is referred to as a convection cell.
Final answer:
Air density impacts movement in convection cells, with warm, less dense air rising and cool, denser air sinking, creating a cycle that drives convection currents and influences weather patterns.
Explanation:
The density of air affects its movement in a convection cell because warm air that is less dense rises, while cooler, denser air sinks. This movement of air due to differences in density is what drives convection currents. As a fluid, such as air, is heated, it expands, becoming less dense than the surrounding fluid. This decrease in density results in buoyancy, causing the air to rise. At higher elevations or as the air mass expands and comes into contact with cooler environments, it loses heat, becomes denser and hence sinks back down, creating a convection cell, as seen in phenomena such as Hadley cells and local weather patterns like thunderstorms. In essence, the difference in density affected by the temperature is responsible for the movement of air within these cells, transferring energy from one place to another.
About 75% of living matter is made up of which two essential chemicals?
calcium,phosphorus,potassium,and sulfer
Answer:
Carbon and oxegyn
Explanation:
PLEASE SHOW WORK I CANT FIGURE THESE OUT
1. 5,400 inches to miles: 0.085227 miles.
2. 16 weeks to seconds: 8,966,400 seconds.
3. 54 yards to mm: 49,381.76 mm.
4. 36 cm/sec to mph: 0.080502 mph.
using the dimensional analysis-
1. 5,400 inches to miles:
5,400 inches * (1 foot / 12 inches) * (1 mile / 5,280 feet) = 0.085227 miles.
2. 16 weeks to seconds:
16 weeks * 7 days/week * 24 hours/day * 60 minutes/hour * 60 seconds/minute = 8,966,400 seconds.
3. 54 yards to mm:
54 yards * 3 feet/yard * 30.48 cm/foot * 10 mm/cm = 49,381.76 mm.
4. 36 cm/sec to mph:
36 cm/sec * (1 foot / 30.48 cm) * (1 mile / 5,280 feet) * (3600 sec / 1 hour) = 0.080502 mph.
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The complete question is -Dimensional Analysis Worksheet Set up and solve the following using dimensional analysis.
1 mile = 5,280 ft 1 inch = 2.54 cm
3 feet = 1 yard 454 g = 1lb
946 ml 1 qt 4 qt=1 gal
1) 5,400 inches to miles
2) 16 weeks to seconds
3) 54 yards to mm
4) 36 cm/sec to mph
A 126.1-gram block of granite at 92.6°C is dropped into a tub of water at 24.7°C in an isolated system. The final temperature of both the granite and the water is 51.9°C. The specific heat capacity of granite is 0.795 joules/gram degree Celsius, and the specific heat capacity of water is 4.186 joules/gram degree Celsius.
The granite block transferred 1.____ of energy, and the mass of the water is 2.____ .Copy
1
A. 21,500 joules
B. 6,810 joules
C. 4,080 joulesCopy
2
A. 189 grams
B. 55.8 grams.
C. 35.8 grams
The granite block transferred 4080 J of energy, and the mass of the water is 35.8 g.
1. Energy from granite block
The formula for the heat (q) transferred is
q = mCΔT
m = 126.1 g; C = 0.795 J·°C⁻¹g⁻¹; ΔT = T_f – T_i = 51.9 °C - 92.6 °C = -40.7 °C
∴ q = 126.1 g × 0.795 J·°C⁻¹g⁻¹ × (-40.7 °C) = -4080 J
The granite block transferred 4080 J.
2. Mass of water
q = mCΔT
m = q/(CΔT)
q = 4080 J; C = 4.186 J·°C⁻¹g⁻¹; ΔT = T_f – T_i = 51.9 °C – 24.7 °C = 27.2 °C
∴ m = 4080 J/(4.186 J·°C⁻¹g⁻¹ × 27.2 °C) = 35.8 g
The mass of the water is 35.8 g.
The granite block transferred 4,080 joules of energy, and the mass of the water is 35.8 grams.
How we calculate heat transfer of any system?Heat transfer in any system can be calculated as follow:
q = mCΔT
Heat transfer by the granite block is calculated as follow:
q = mCΔT, where
m = mass of granite = 126.1 g (given)
C = specific heat of granite = 0.795 joules/gram degree Celsius (given)
ΔT = change in temperature of granite = 51.9 °C - 92.6 °C = -40.7 °C (given)
Putting all these values in the above equation, we get
q = 126.1 × 0.795 × -40.7 = -4080 J
Now by using the above formula, we can also calculate the mass of water in the following way:
m = q / CΔT, where
C = specific heat of water = 4.186 joules/gram degree Celsius (given)
ΔT = change in temperature of water = 51.9 °C – 24.7 °C = 27.2 °C
Putting all these values in the above equation, we get
m = -4080 / 4.186 × 27.2 = 35.8 g.
Hence, 4,080 joules of energy is transferred by granite block and 35.8 g is the mass of water.
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What did Antoine Lavoisier’s experiments demonstrate
Answer: Mass is neither lost nor gained during a chemical change.
Explanation:
Antoine Lavoisier’s Law of Conservation of Mass:
'In a chemical reaction the mass can neither be created and nor be destroyed'.
In a chemical reaction the mass of reactants is equal to the mass of products which means that the mass remain conserved.
For Example: In a chemical reaction:
[tex]2H_2+O_2\rightarrow2H_2O[/tex]
Mass of reactants = Mass of products
Mass of hydrogen molecule + mass of oxygen molecule = Mass of water
[tex]2\times (1)(2)+ 1\times (16)(2)= 2\times((1)(2)+(16)(1))=36[/tex]
From this we can see that the mass remains conserved in the chemical reaction.
Antoine Lavoisier's experiments fundamentally transformed the field of chemistry, particularly through his work on the law of conservation of mass.
Antoine Lavoisier's demonstrated that mass is neither created nor destroyed in chemical reactions, leading to the understanding that the total mass of reactants equals the total mass of products. This was a groundbreaking realization, as it contradicted the then-prevalent phlogiston theory, which posited that substances contained a fire-like element.
Lavoisier also played a crucial role in identifying and naming elements, distinguishing between elements and compounds, and introducing a systematic chemical nomenclature. His careful measurements during experiments laid the groundwork for quantitative analysis in chemistry. By meticulously weighing reactants and products, he provided strong evidence for the conservation of mass, which is a foundational principle in modern chemistry.
In the example above, imagine that the sunlight, solar cell, and fan form a closed system and no heat is generated. In this situation, after 1,000 kilojoules of light energy enter the system, kilojoules of electric energy are transformed into kilojoules of kinetic energy.
Answer:
both drop downs are 1000
Explanation:
According to the law of conservation of energy, 1000 kilojoules of electric energy are transformed into 1000 kilojoules of kinetic energy.
What is law of conservation of energy?
According to law of conservation of energy , it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1812.
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Crystals are characterized by particular patterns that repeat in how many dimensions? A. three dimensions
B. one dimension only
C. two dimensions only
A option is correct answer .
Answer:
A. three dimensions
Explanation:
Crystal lattice have a three dimensional array of repeating units. For example, in the NaCl crystal the repeating units are the Na⁺ and Cl⁻ ions. The Na⁺ and Cl⁻ ions are arranged alternately along the x, y and z axis. The smallest repeating unit of a cell is called unit cell. Crystal lattice have a definite geometry which is because of this rigid array of unit cells.
Is cake batter a pure substance or mixture
Cake batter is not a pure substance but rather a mixture because it is made of different ingredients like flour, sugar, and eggs that retain their original properties even when mixed together.
Explanation:Cake batter is not a pure substance, but rather a mixture. In Chemistry, a pure substance is an elemental or compound matter with constant composition and properties throughout. This means it's made up of a single type of particle, like gold (element) or water (compound), which can't be separated into other kinds of matter by physical means.
On the other hand, a mixture consists of two or more different substances which are mixed but not combined chemically.
In cake batter, one can find flour, sugar, eggs, and other ingredients that retain their original properties even when mixed together to make the batter. Therefore, we can classify cake batter as a mixture.
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When placed in a freezer, liquid water turns into solid ice. What best describes this change?
The water molecules slow down, bonds are broken, and the separated atoms spread out.
The water molecules slow down, stronger attractions form between them, and the molecules are pulled closer together.
The water molecules speed up, attractions between them become weaker, and the molecules spread out.
The water molecules speed up, new bonds are formed, and the new molecules are pulled closer together.
Answer:
The water molecules slow down, stronger attractions form between them, and the molecules are pulled closer together.
Explanation:
In solids the packing of the particles is closer and tighter thus increasing the intermolecular attraction. This makes solids rigid with a definite shape, size and volume. On the other hand in liquids the packing of the particles is loose thus decreasing the intermolecular attraction. This makes liquids able to flow, and takes the shape and volume of the container in which they are placed.
The correct description of the change when liquid water turns into solid ice in a freezer is:
The water molecules slow down, bonds are broken, and the separated atoms spread out. (first option)
What best describes this change?Something interesting about water is that the solid state (ice) has a larger volume than the liquid one.
The expansion of ice compared to liquid water is due to the formation of an open, hexagonal crystal lattice in the solid ice structure, which results in ice having a lower density than liquid water. This expansion is related to the hydrogen bonds between water molecules, which create a network that pushes the molecules apart in the solid state, making ice less dense.
So, to accurately describe the change when liquid water turns into solid ice:
The water molecules slow down, stronger hydrogen bonds form between them, and the molecules are arranged in a hexagonal crystal lattice, causing ice to have a larger volume than liquid water.
The correct option would be the first one.
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What elements are not balanced in the equation MgO + 2 LiCl = MgCl2 Li2O
The answer is all elements are balanced.
Answer: This is a balanced equation
An easy way to figure out if the equation is balanced or not is that each element in the R.H.S should be equal to the element in the L.H.S
R.H.S L.H.S
Mg = 1 Mg = 1
O = 1 O = 1
Li = 2 Li = 2
Cl = 2 Cl = 2
As both of them have equal number of elements they are balanced.
A student is writing his procedure for his science fair project. His teacher reminded him that his experiment should include repetition and should be replicable. Here is the procedure he came up with to determine which brand of diaper is the most absorbent: 1) Purchase 5 different brands of diapers and measure their weight. 2) Have baby sister wear each diaper for 1 hour. 3) Measure the weight of the diaper after 1 hour to see how much liquid it absorbed. 4) Do the experiment again every day for a week. 1) Q: A: Does the student's proposed procedure include repetition? Why or why not? A) Yes, the experiment includes repetition because the student tests 5 different brands of diapers. B) Yes, the experiment includes repetition because the student performs the experiment multiple times. C) No, the experiment does not include repetition because the student only tests the diapers on his sister and not any other babies. D) No, the experiment does not include repetition because the student only has the baby wear the diaper for 1 hour at a time instead of repeating the experiment with different time periods. 2) Is the student's experiment replicable? Why or why not? A) Yes, the student's experiment is replicable since he performed the experiment a total of 7 times. B) Yes, the student's experiment is replicable because any other student could easily follow his procedure. C) No, the student's procedure is not replicable because it is too complicated for someone else to repeat it. He should have limited it to one brand of diaper and only done the experiment for one or two days. D) No, the student's procedure is not replicable because it depends on too many outside factors that can't be controlled, such as how much his sister had to drink or if she even went to the bathroom during the one hour.
Answer.1 B
Explanation:
Student's proposed procedure includes repetitions because in his procedure he had mentioned that he had repeated the same experiment by making his sister wear different diapers from another four brands after each hour. And also repeated the same whole experiment for a week.
Answer.2 D
Explanation:
Procedure is not replicable as there were many independent and dependent factors which cannot be replicated.
Answer:
B
Explanation:
while carrying a microscope slide to her lab bench, a student drops it and the slide shatters on the floor.The next step should be to?
A) call 911.
B)place a chemical blanket on top of the broken glass.
C)sweep up the slide and place in the broken glass dispenser.
D)pick up the slide carefully with her hands and place it in the trash can.
E)RUN RUN WE GANA DIE!!!
The next step is C
It isn't A because it is not an emergency
B is for spills I believe
D is wrong because using her hands could be dangerous as she may cut herself.
Use the periodic table to identify each of the following bonds as polar or nonpolar. C—Cl polar nonpolar
Answer: Polar bonds
Carbon (C) has 4 electrons in the valence electrons whereas chlorine has 7. Each carbon and chlorine (Cl) will form a polar covalent bond.
Non polar bonds, develop where two atoms share a pair of electrons with each other. Hence they are known as Non-polar covalent bonds and they have equal electronegativities
In polar bonds, the electrons are shared unequally between the atoms which as a result increases the electronegativity difference which makes it ionic.
The bond is polar bond.
Explanation:Carbon belongs to Group no 4 of periodic table which means It's valency is 4.While chlorine belongs to 7 group of periodic table and have valency of 1.The bond is covalent but it is polar due to electronegativity difference.The Cl is more electronegative than C.So the bond is C—Cl is polar. Carbon is partial positive while chlorine is partial negative.
what is amu of 99 % H-1, .2% H-1 and .8% H-3
The average atomic mass of your mixture is 1.03 u .
The average atomic mass of H is the weighted average of the atomic masses of its isotopes.
We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its % abundance).
Thus,
0.99 × 1.01 u = 0.998 u
0.002 × 2.01 u = 0.004 u
0.008 × 3.02 u = 0.024 u
TOTAL = 1.03 u
Which chemical equation represents a precipitation reaction? A. Mg(ClO3)2(aq) + 2HCl(aq) → MgCl2(aq) + 2HClO3(aq) B. AlBr3(aq) + 3LiI(aq) → AlI3(aq) + 3LiBr(aq) C. NH4NO3(aq) + HBr(aq) → NH4Br(aq) + HNO3(aq) D. Li2CO3(aq) + FeCl2(aq) → 2LiCl(aq) + FeCO3
Answer is D.
Among the given options, the products of equation A, B and C are aqueous solutions. Those are indicated by using (aq).
The balanced equation for the reaction between Li₂CO₃(aq) and FeCl₂(aq) is Li₂CO₃(aq) + FeCl₂(aq) → 2LiCl(aq) + FeCO₃(s)
LiCl is a salt while FeCO₃ is a Grey/green color precipitate. Hence, option D represents a precipitation reaction.
Answer:
plato / edmentum
Explanation:
which tool is most suitable for a chemist to measure the mass of a liquid? A. electronic balance B. graduated cylinder C. measuring cup D. meter stick
A is automatically out! since you can't put liquid on an electronic balance.
D.is also out! the most you can do with a meter stick is see how high the water is.
C. IS wrong A measuring cup is closer but not what were looking for.
the answer is B.Graduated Cylinder!
Answer:
It is the graduated cylinder
Explanation:
is water wet? (this is a homework question)
No. water itself cannot be wet it makes things wet but because water molecules are already water it cannot make itself wet so in other words water makes things wet but its not exactly wet itself.
water is not wet because it is a liquid that wet things once you come in contact with water you become wet until then water is liquid and you stay dry
how does the particle in plasmas compare with the particles in solids
why does magnesium have a larger atomic radius that chlorine
Magnesium AR: 150 pm
Chlorine AR: 100 pm
Please help me with these questions I don't get science
How many different elements are in our bodies?
What are the 6 elements that make up 95% of our bodies?
There are at least 60 elements in our bodies.
Other elements may be present, but in such small quantities that we cannot detect them with current technologies.
The six most abundant elements (by mass) in our bodies are:
Oxygen 65 %
Carbon 18 %
Hydrogen 10 %
Nitrogen 3.2 %
Calcium 1.4 %
Phosphorus 1.1 %
TOTAL = 99 %
PLEASE HELP WILL MARK BRAINIEST
Which is a property that most metals have in common?
Select one:
a. brittle
b. shiny
c. poor conductor of electricity
d. tend to gain 1 or more electrons in a chemical reaction
Tellurium is a silvery-white, brittle element. Its electrical conductivity varies, but increases slightly with exposure to sunlight.
This element belongs to which region of the periodic table of the elements?
Select one:
a. metalloids
b. noble gases
c. metals
d. nonmetals
Most of the elements of which region of the periodic table are located directly to the right of the metalloids?
Select one:
a. metals
b. nonmetals
c. noble gases
Which is a property that most solid nonmetals have in common?
Select one:
a. shiny
b. brittle
c. tend to lose 1 or more electrons in a chemical reaction
d. good conductors of electricity
Which is a property that most nonmetals have in common?
Select one:
a. poor conductors of electricity
b. tend to lose 1 or more electrons in a chemical reaction
c. malleable
d. shiny
Metals have the property of being shiny. Tellurium is a metal and belongs to the metallic region of the periodic table. Solid nonmetals are brittle, and most nonmetals are poor conductors of electricity.
The property that most metals have in common is that they are shiny. This is due to the way metals reflect light. Metals have free electrons that are able to move around, creating a smooth and shiny surface.
Tellurium is a silvery-white, brittle element that belongs to the metals region of the periodic table.
Most of the elements located directly to the right of the metalloids in the periodic table are nonmetals.
The property that most solid nonmetals have in common is that they are brittle. Nonmetals tend to be brittle because they lack the metallic bonding that gives metals their strength and ductility.
A property that most nonmetals have in common is that they are poor conductors of electricity. Nonmetals do not have free electrons like metals, so they are not able to conduct electricity as well.
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(easy)+(25 points)
What is the net force acting on the object (represented by the solid circle) in this diagram?
146 is the net force I love ur pic btw.
The answer is 200N to the left
Dan wrote the following phrase to describe the movement of particles in a state of matter.
"Small pea seeds move around each other but do not bounce off."
Which state of matter did Dan most likely describe?
Gas
Plasma
Liquid
Solid
Final answer:
Dan most likely described a liquid state of matter because the particles are in constant contact, can move around each other, and don't bounce off, unlike in a gas. This movement is due to the relatively strong intermolecular forces that are characteristic of liquids.
Explanation:
Based on Dan's description of particles that 'move around each other but do not bounce off,' he is likely describing the liquid state of matter. In a liquid, the particles are close enough to experience strong intermolecular interactions, which usually keep the particles contained within the liquid boundary. However, unlike solids, the particles within a liquid are not fixed in position and have the ability to move around and flow, thus allowing them to take the shape of their container while maintaining a definite volume. Liquids are characterized by the ability of particles to slide past one another, which differentiates them from the fixed positions of particles in a solid and the free, independent movement of particles in a gas.
Which of the following best explains the flow of energy in this food web? (3 points)
Mushrooms → Hawk → Squirrel → Grasshopper
Grasshoppers → Snake → Wolf → Hawk
Plants → Squirrel → Snake → Mushrooms
Mushrooms → Snake → Squirrel → Plants
The best explanation for the flow of energy in the food web is:
Plants → Squirrel → Snake → Mushrooms
Third option is correct.
In this food web, energy flows from plants to squirrels, then from squirrels to snakes, and finally from snakes to mushrooms. This flow of energy represents the transfer of energy through different trophic levels.
1. Plants (primary producers) capture energy from the sun through photosynthesis and convert it into food energy (carbohydrates).
2. Squirrels (primary consumers) eat plants to obtain the energy stored in them.
3. Snakes (secondary consumers) eat squirrels, obtaining the energy stored in the squirrel's body.
4. Mushrooms (decomposers) break down the remains of the snake and other dead organisms, releasing nutrients and energy back into the ecosystem.
Each step in the food web represents a transfer of energy from one organism to another, and the direction of energy flow is from the source of energy (plants) through various consumers and eventually to decomposers.
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What is nuclear energy? energy from solar panels energy locked in the nucleus of an atom energy of moving electrons energy that travels in waves
Answer: Energy locked in the nucleus of an atom
Explanation:
Nuclear energy is an energy which binds the constituents of nucleus of an atom together.
There are two types of nuclear reaction from which nuclear energy is produced:
Nuclear fusion: Two small nuclei combine together to form stable nucleus with release in energy.Nuclear fission: One larger unstable nucleus splits into smaller stable nuclei with release in energy.Coal is made of carbon. Coal burns at high temperature in the presence of oxygen. The result of this chemical reaction is
c +o 2 = co 2 i think....hopefully its not wrong
State the law of conservation of mass. This law applies to physical changes as well as chemical changes. With this law in mind, explain what happens to the mass of 18 mL of liquid water when it vaporizes to form about 22 L of water vapor.
Final answer:
The law of conservation of mass implies that the mass remains constant in closed systems, during both physical and chemical changes. Therefore, when 18 mL of liquid water vaporizes to 22 L of water vapor, the mass remains unchanged despite the change in volume.
Explanation:
Law of Conservation of Mass
The law of conservation of mass states that the mass of a closed system must remain constant over time, as system mass cannot change quantity if it is not added or removed. During physical and chemical changes, matter can change form, such as from a liquid to a gas, but the mass of the system remains the same. This means that if 18 mL of liquid water vaporizes to form about 22 L of water vapor, the mass of the water vapor will still be equal to the mass of the liquid water prior to vaporization.
Example of Conservation of Mass
In the example provided, when water is heated and changes from a liquid to a gas, it expands greatly in volume, but the total mass remains unchanged. Although 18 mL of water becomes 22 L of water vapor, this physical change does not result in a loss or gain of mass. This illustrates that during vaporization, a physical change, the law of conservation of mass is obeyed.
The mass of the water remains constant at 18 grams before and after vaporization, in accordance with the law of conservation of mass.
The law of conservation of mass states that mass cannot be created or destroyed in an isolated system during a physical or chemical change. This means that the total mass of the reactants in a chemical reaction must equal the total mass of the products. Similarly, when a physical change occurs, such as a change of state, the mass remains constant.
In the given scenario, 18 mL of liquid water vaporizes to form approximately 22 L of water vapor. To apply the law of conservation of mass, we need to consider the mass of the water before and after vaporization, not the volume. The density of water is approximately 1 gram per milliliter, so 18 mL of liquid water has a mass of about 18 grams.
When water vaporizes, it undergoes a phase change from liquid to gas, expanding in volume as it becomes less dense. However, the number of water molecules does not change during this process, and since mass is a measure of the amount of matter, the mass of the water vapor will be the same as the mass of the original liquid water.
Therefore, even though the volume of the water changes dramatically from 18 mL to 22 L, the mass of the water remains constant at 18 grams, in accordance with the law of conservation of mass. The volume increase is due to the water molecules spreading out to fill the available space as a gas, but the total mass of the water molecules themselves does not change.
what does it mean that gold has a specific heat capacity of 0.135 J/g*C
A specific heat capacity of 0.135 J·°C⁻¹g⁻¹ means that it takes 0.135 J of energy to change the temperature of 1 g of gold by 1 °C.
A 5.00g sample of impure CaCO3 is found to react completely with 100.0 mL of 0.100 M of H2SO4. The equation for the reaction is: CaCO3 (s) + H2SO4 (aq) —> CaSO4 (s) + CO2 (g) + H2O (l). What is the mass percent CaCO3 in the impure sample?
Hey there!:
Given the reaction:
CaCO3(s) + H2SO4(aq) -------> CaSO4(s) + CO2(g) + H2O(l)
volume in liters( H2SO4 ) = 100 mL / 1000 => 0.1 L
Moles of H2SO4:
Molarity * Volume ( L )
0.100 * 0.1 => 0.01 moles of H2O4
1 mole H2SO4 reacted with -------------- 1 mole CaCO3
0.01 moles H2SO4 reacted with ------- 0.01 moles CaCO3
Molar mass CaCO3 = 100.0869 g/mol
Mass of CaCO3 :
Moles of CaCO3 * Molar mass CaCO3
0.01 * 100.0869 => 1.000869 g of CaCO3
Therefore:
% mass = ( Mass of CaCO3 / mass of sample ) * 100
% mass = ( 1.000869 / 5.00 ) * 100
% mass = 0.2001738 * 100
% mass = 20.01%
Hope that helps!