Final answer:
The molarity of the diluted solution after adding 27.5 mL of 16.0 M nitric acid stock solution to 300 mL of water is 1.34 M.
Explanation:
The student is asking about how the molarity of a nitric acid solution changes after dilution. To find the molarity of the diluted solution, we use the formula M1V1 = M2V2, where M1 and V1 represent the molarity and volume of the concentrated solution, and M2 and V2 represent the molarity and volume of the diluted solution.
In this case, the initial concentration (M1) is 16.0 M and the initial volume (V1) is 27.5 mL. The final volume (V2) after dilution is the sum of the volume of the stock solution plus the volume of water added, which is 27.5 mL + 300 mL = 327.5 mL. We are solving for the final concentration (M2).
Applying the dilution formula: (16.0 M) × (27.5 mL) = M2 × (327.5 mL). Dividing both sides of the equation by 327.5 mL, we get M2 = (16.0 M × 27.5 mL) / 327.5 mL.
Performing the calculation:
M2 = (16.0 × 27.5) / 327.5
M2 = 1.34 M, which is the molarity of the diluted solution.
What is an element?
a. A substance that is made of water.
b. A substance made of only one type of atom.
c. A substance that is made of no atoms.
d. A substance made of more than one type of atom.
Answer:
b. a substance made of only one type of atom
Explanation:
Elements are what you find on the periodic table of elements.
Take oxygen, for example. You can have one or multiple atoms, but if they are all oxygen atoms it's an element.
"a" is incorrect because water is not an element, it is a compound.
"c" is incorrect because such a thing (as far as we know) does not exist, unless we are talking about subatomic particles like protons, neutrons, and electrons that make up an atom.
"d" is incorrect because it describes a compound.
A description of the solar system in which all the planets revolve around
the sun is called
How many moles of MgCl2 are contained in 261.5 mL of a 0.005 M MgCl2 solution? Please show your work.
The answer for the following problem is mentioned below.
Therefore the no of moles in the magnesium chloride solution is 1.3075 moles.Explanation:
Molarity:
The no of moles of moles present in one litre of the solution is called molarity
Given:
molarity of magnesium chloride (m) = 0.005 M
volume of magnesium chloride solution (V) = 261.5 ml
To find:
no of moles of magnesium chloride solution (n)
We know;
molarity = [tex]\frac{n}{V}[/tex]
m = [tex]\frac{n}{V}[/tex]
where;
m represents the molarity of the magnesium chloride solution
n represents the no of moles of magnesium chloride solution
V represents the volume of magnesium chloride solution
So;
0.005 = [tex]\frac{n}{261.5}[/tex]
n = 0.005 × 261.5
n = 1.3075 moles
Therefore the no of moles in the magnesium chloride solution is 1.3075 moles.
Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?
Answer:
Examine the multiple bond for cis- and trans- isomers.
Explanation:
Answer:
B. Examine the multiple bond for cis- and trans- isomers.
Explanation:
Was energy made or created
Answer:
Energy cannot be created nor destroyed
Explanation:
Law of conservation of energy
What is the molality of 49 grams of NaCl in 469 grams of H2O (water)
Answer : The molality of sodium chloride is, 1.79 m
Explanation :
To calculate the molality of solution, we use the equation:
[tex]\text{Molality}=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ (in grams)}}[/tex]
Where,
[tex]m_{solute}[/tex] = Given mass of solute (sodium chloride) = 49 g
[tex]M_{solute}[/tex] = Molar mass of solute (sodium chloride) = 58.5 g/mol
[tex]W_{solvent}[/tex] = Mass of solvent (water) = 469 g
Now put all the given values in above equation, we get:
[tex]\text{Molality of }NaCl=\frac{49g\times 1000}{58.5g/mol\times 469kg}\\\\\text{Molality of }NaCl=1.79mol/kg=1.79m[/tex]
Hence, the molality of sodium chloride is, 1.79 m
A student is designing an experiment about the factors that affect math
grades. Which statement best represents a possible hypothesis for this
experiment?
Answer: B. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher.
Explanation: A hypothesis is defined as a tentative or predictions or an educated guess of scientific questions. A hypothesis is always done before performing an experiment.
The correct hypothesis for the given experiment will be "If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher" because it has an if-then statement which is a conditional statement where statement after "if represents hypothesis" and "then represents conclusion".
Hence, the correct answer is "B. If students spend at least 1 hour per night studying math, then they will get a grade of 85 or higher."
A possible hypothesis for an experiment on factors affecting math grades could be: 'The amount of time spent studying directly affects math grades'. This hypothesis can be tested by tracking students' study times and their corresponding math grades.
Explanation:In designing an experiment about factors that affect math grades, a possible hypothesis could be: 'The amount of time spent studying directly affects math grades.' This hypothesis is testable and directly relates to the experiment's topic. You could set up an experiment where you track a group of students' math grades and measure the amount of time they dedicate to studying math. If those who study more have better math grades, your hypothesis would be supported.
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Which of the following characteristics are true of enzymes? Check all that apply.
The structure of an enzyme can change if conditions change.
A single enzyme can normally catalyze a wide variety of reactions under many conditions
Enzymes are found only in nonliving systems.
2 Enzymes allow living things to regulate body conditions through feedback mechanisms.
Enzymes bind to specific substrates in specific ways.
Enzymes increase the rate of reaction.
When shown in energy-reaction diagrams, enzymes represent the higher activation energy.
Answer:
The structure
Enzymes allow
Enzymes blind
Emzymes increase
Explanation:
Enzymes are biological catalysts that are essential to the functioning of living things. They are able to adapt their structure in response to various circumstances, which allows them to perform catalytic tasks with flexibility.
One enzyme can catalyse a wide variety of processes, which adds to the metabolic flexibility. Through feedback mechanisms, enzymes give organisms the ability to control physiological circumstances and maintain homeostasis.
Enzymes increase reaction speeds by lowering activation energy barriers by precisely binding to particular substrates. Cells can function well thanks to this catalytic process.
Thus, on the contrary, enzymes reduce the activation energy, speeding up processes. Enzymes are dynamic organisms at the centre of biological processes that expertly direct molecular changes.
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helppp!!!!!! pleaseeee
Answer:
A
Explanation:
you need to make a punnent squere
L L
l Ll Ll
l Ll Ll
Summarize a paragraph of what you’ve learned about mile carnival
How many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution?
Answer: 0.075
Explanation:
(concentration in molarity)(volume in liter) = answer
0.15 mol/L *0.500L = 0.075 mol
The number of moles of H2SO4 in the given solution is 0.075 moles.
Explanation:The question is asking how many moles of H2SO4 are present in 0.500 L of a 0.150 M H2SO4 solution.
To answer this question, we can use the equation:
Moles of solute = concentration (M) x volume (L)
In this case, the concentration is 0.150 M and the volume is 0.500 L. Plugging these values into the equation, we get:
Moles of H2SO4 = 0.150 M x 0.500 L = 0.075 mol
Therefore, there are 0.075 moles of H2SO4 present in 0.500 L of the solution.
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Select the correct answer.
The chemical composition of most stars usually has which element in the highest concentration?
A. oxygen
B. hydrogen
OC. chromium
OD. lead
Answer:
B. Hydrogen
Explanation:
Answer:
B. Hydrogen
Explanation:
The most abundant gas is hydrogen which is fuel used by stars to create energy.
How many protons and neutrons does the isotope Ab-298 have? 118 protons and 200 neutrons 200 protons and 178 neutrons 119 protons and 179 neutrons 119 protons and 180 neutrons
Answer:
119 protons and 179 neutrons
Explanation:
Given an element of the form AB-298, we know that 298 is the mass, which means it's the sum of the number of protons and number of neutrons.
Look at the answer choices and find the one whose numbers add up to 298. Only C (119 protons and 179 neutrons) is correct because 119 + 179 = 298.
Hope this helps!
Sally adds 3.13 moles of argon to a 5.29 liter balloon that already contained 2.51 moles of argon. What is the volume of the balloon after the addition of the extra gas?
Answer:
6.60 L
Explanation:
3.13 mol * 5.29 L / 2.51 mol = 6.59669323 liters but sig figs so 6.60 L
The volume of the balloon after adding the extra argon gas is approximately 11.89 liters.
To determine the volume of the balloon after adding the extra argon gas, we can use the concept of the ideal gas law, which states:
PV = nRT
where:
- P is the pressure
- V is the volume
- n is the number of moles
- R is the ideal gas constant
- T is the temperature
Since the problem doesn't specify changes in pressure or temperature, we'll assume they remain constant. Therefore, the volume is directly proportional to the number of moles of gas ( [tex]V \propto n[/tex] ).
Initially, the balloon contains 2.51 moles of argon in 5.29 liters.
We can set up the proportional relationship:
[tex]\frac{V_1}{n_1} = \frac{V_2}{n_2}[/tex]
Given:
- V₁ = 5.29 liters
- n₁ = 2.51 moles
- n₂ = 2.51 + 3.13 = 5.64 moles
We need to find V₂ :
[tex]\frac{5.29 \, \text{L}}{2.51 \, \text{moles}} = \frac{V_2}{5.64 \, \text{moles}}[/tex]
Solving for V₂ :
[tex]V_2 = \frac{5.29 \, \text{L} \times 5.64 \, \text{moles}}{2.51 \, \text{moles}} \\\\V_2 = \frac{29.8356 \, \text{L} \cdot \text{moles}}{2.51 \, \text{moles}} \\\\V_2 \approx 11.89 \, \text{L}[/tex]
Therefore, the volume of the balloon after adding the extra argon gas is approximately 11.89 liters.
How many atoms of chlorine are in 1.00 mol of chlorine gas
1.00 mole of chlorine gas contains 1.20442815×10²⁴ atoms of chlorine.
Explanation:The subject of this question is chemistry, specifically moles and atoms. In chemistry, a mole is a unit used to talk about a very large number of things — approximately 6.02214076×10²³, which is known as Avogadro's Number. When you have 1.00 mole of something, you have 6.02214076×10²³ of it. This means that 1.00 mol of chlorine gas (Cl₂) contains 2.00 moles of chlorine atoms. Therefore, 1.00 mol of chlorine gas contains 2.00 x 6.02214076×10²³ = 1.20442815×10²⁴ atoms of chlorine.
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Final answer:
In 1.00 mol of chlorine gas, which is diatomic (Cl₂), there are 1.2044 × 10²´ atoms of chlorine, as one mole of Cl₂ contains 6.022 × 10²³ molecules, and each molecule has two chlorine atoms.
Explanation:
To determine how many atoms of chlorine are in 1.00 mol of chlorine gas (Cl₂), we must understand the molecular composition of chlorine gas. Chlorine gas is diatomic, which means each molecule consists of two chlorine atoms. According to Avogadro's number, one mole of any substance contains 6.022 × 10²³ entities (atoms, molecules, etc.). Thus, in 1 mole of Cl₂, there are 6.022 × 10²³ molecules of Cl₂.
Since each Cl₂ molecule contains two chlorine atoms, to find the total number of chlorine atoms in one mole of Cl₂, we simply multiply Avogadro's number by two:
6.022 × 10²³ molecules/mol × 2 atoms/molecule = 1.2044 × 10²´ atoms of chlorine.
Therefore, 1.00 mol of chlorine gas contains 1.2044 × 10²´ atoms of chlorine.
What is the molarity of the solution if 1.50 grams of CaCl2 is dissolved to make 0.095 liters of solution?
Answer:
0.142 M
Explanation:
First, convert grams of CaCl2 to moles. The molar mass of CaCl2 is 110.984 g/mol. You should get 0.0135 moles.
Divide moles by liters to find molarity. You should get 0.142 M
Directions: The solubility curve for several common salts is shown in the graph. Use the graph to answer any questions that follow.
A KNO3 solution hits saturation when 75 g of salt have dissolved. At which temperature is the solution?
A.
15°C
B.
25°C
C.
45°C
D.
55°C
The saturation of a KNO3 solution at 75g corresponds to the temperature on the solubility curve where 75g aligns with, in this case purported as 25°C (Option B).
Explanation:To answer the question regarding the saturation of a KNO3 solution, you'd want to align the given quantity, 75g, on the y-axis (representing salt dissolved) with the corresponding temperature on the x-axis of the solubility curve. As the exact graph isn't provided within the question, let's assume that 75g of KNO3 aligns with 25°C. This would mean that a KNO3 solution hits saturation at 75g at 25°C, thus the answer would be B (25°C). Remember that the solubility of a substance increases with temperature, thereby allowing more salt to dissolve.
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A propane stove burned 470 grams propane and produced 625 grams of water (this is the actual yield) C3H8 +5O2=3CO2+4H20. What was the percent yield of water for the stove?
I would really appreciate the help. I don't understand how to begin.
Answer:
81.3%
Explanation:
Step 1:
The balanced equation for the reaction:
This is shown below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Step 2:
Data obtained from the question. This includes:
Mass of propane (C3H8) = 470 g
Actual yield of water (H2O) = 625 g
Percentage yield of water (H2O) =?
Step 3:
Determination of the mass of propane (C3H8) burned and the mass of water (H2O) produce from the balanced equation. This is illustrated below:
C3H8 + 5O2 —> 3CO2 + 4H2O
Molar Mass of C3H8 = (3x12) + (8x1) = 36 + 8 = 44g/mol
Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/mol
Mass of H2O from the balanced equation = 4 x 18 = 72g
From the balanced equation above,
44g of C3H8 was burned and 72g of H2O was produced.
Step 4:
Determination of the theoretical yield of H2O. This is illustrated below:
From the balanced equation above,
44g of C3H8 produced 72g of H2O.
Therefore, 470g of C3H8 will produce = (470x72)/44 = 769.09g of H2O.
Therefore, the theoretical yield of H2O is 769.09g
Step 5:
Determination of the percentage yield of water (H2O). This is illustrated below:
Actual yield of water (H2O) = 625g
theoretical yield of H2O = 769.09g
Percentage yield of water (H2O) =?
Percentage yield = Actual yield/Theoretical yield x100
Percentage yield = 625/769.09 x100
Percentage yield = 81.3%
Therefore, the percentage yield of water (H2O) is 81.3%
Final answer:
The percent yield of water produced during the combustion of propane is calculated as the actual yield divided by the theoretical yield, multiplied by 100. Using stoichiometry, it is determined to be 81.35%.
Explanation:
The question is about the percent yield of water produced during the combustion of propane. The formula to calculate percent yield is actual yield divided by theoretical yield, multiplied by 100. First, we must establish the theoretical yield of water in moles. Propane has a molar mass of approximately 44.1 g/mol, so 470 grams of propane is equivalent to approximately 10.657 moles (470g / 44.1g/mol). The balanced equation states there are 4 moles of water produced per mole of propane, which would yield 42.628 moles of water (10.657 moles C3H8 x 4 moles H2O). Since the molar mass of water is about 18.015 g/mol, we multiply the moles of water by its molar mass to find the theoretical yield in grams: 768.311 g (42.628 moles x 18.015 g/mol). With an actual yield of 625 grams, we can now determine the percent yield: (625g / 768.311g) x 100% = 81.35%. Therefore, the percent yield of water for the stove is 81.35%.
In Figure 9-2, are both kinds of atoms in balance, only nitrogen atoms in balance, only oxygen atoms
in balance, or neither kind of atom in balance?
Figure 9-2
A) The equation is balanced for both kinds of atoms
B) The equation is balanced for oxygen atoms only
C) The equation is balanced for nitrogen atoms only
D) The equation is balanced for either kind of atom
Answer:
C) The equation is balanced for nitrogen atoms only
Explanation:
nitrogen (black one) - 1 before and 1 after reaction
oxygen (white one) - 3 before and 2 after reaction
So,
C) The equation is balanced for nitrogen atoms only
2 Points
Which role do fish ladders serve?
O
A. They allow fish farmers to raise certain kinds of fish.
O
B. They help some kinds of fish migrate past dam barriers.
O
C. They improve the nutritional value of some kinds of fish.
O
D. They help certain kinds of fish stay physically fit.
Answer:
B. They help some kinds of fish migrate past dam barriers.
Explanation:
Description
A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial and natural barriers (such as dams and waterfalls) so as to enhance diadromous fishes' natural migration as well as movements of potamodromous species.
Boiling point non example
Answer:
any thing under 212 degrees Fahrenheit
Explanation:
the boiling point of water is 212 degrees Fahrenheit so any thing below this would be a non example.
Analyze the graph to describe the solubility of barium nitrate, BaNO3.
At 60°C,________ (100g, 200g, 350g) must be added to 1 L of water to make a saturated solution.
At 25°C, the solubility is about ______ .(100 per L, 125 per L, 150 per L)
A solution that contains 600 g BaNO3 in
3 L of H2O at 70°C is ________. (saturated, supersaturated, unsaturated)
For a solution that contains 300 g BaNO3 in 3 L of H2O at 60°C to become saturated, _________ (100,200,300)g solute must be added.
Answer: The answers are
1) 200g
2) 100g per liter
3) unsaturated
4) 300
Explanation:
At 60°C, 200g must be added to 1 L of water to make a saturated solution. [Observing the graph we can see that at 60, 200g must be added]
At 25°C, the solubility is about 100 per L. [Observing the given graph]
A solution that contains 600g BaNO3 in 3L of H20 at 70°C is saturated.[By knowing the definition of Saturated solution]
For a solution that contains 300 g BaNO3 in 3L of H20 at 60°C to become saturated, 300g soluted must be added.
What are saturated solutions and solubility?A saturated solution is a solution that contains the maximum amount of solute that can be dissolved under the condition at which the solution exists.Solubility is the ability to be dissolved, especially in water or solution.Learn more about solutions, refer to:
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After applying the keratin treatment to Kimi's hair and blowdrying it, Chelsea should set her flat iron to what temperature
The statement for flat iron temperature is "450°F (i.e., 230°C)."
What is temperature?Temperature is the measurement of a body's level of hotness or coolness.
The average kinetic energy of the system is measured by temperature. The kinetic energy of particles in a matter raises as they move faster, which boosts the temperature of the system. When two bodies of differing temperatures come into touch, heat is the energy exchanged between them.
Fine hair strands should be kept at 350–375 degrees Fahrenheit , whereas coarse or thick hair should be at 400–450 degrees Fahrenheit.
Wavy hair can become flat due to heat damage, losing the texture. For some context, 450 degrees Fahrenheit is the temperature at which semi-permanent keratin straightening procedures are performed.
Chelsea should set her flat iron to 450 degrees Fahrenheit, that is 230 degrees Celsius after applying the keratin treatment on Kimi's hair and blow drying it.
Hence, the correct answer is 450°F (i.e., 230°C).
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Pls help! Will mark brainliest!
To be considered _____ they must have lived over a very short period of time and had to be many of them.
A) An index fossil
B) A trace fossil
C) A petrified fossil
D) A carbon fossil
Answer:
A) Index Fossils
Explanation:
Index fossils are fossils used to define and identify geologic periods. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.
1. Aerosol can carry warnings on their labels that say not to incinerate (burn) them or store
the cans above a certain temperature. The gas in a used aerosol can is at a pressure of
103 KPA at 25°C. If the can is thrown into a fire, what will the pressure be when the
temperature reaches 928°C?
3823.36 kPa will be the pressure be when the temperature reaches 928°C.
Explanation:
Data given of aerosol can:
Gas stored at a temperature T1 = 25 °C
pressure of the gas = 103 kPa OR 1.01 atm
If can thrown in fire then temperature T2 = 928 ° C
final pressure when can thrown in fire, P2 =?
Gay Lussac Law is applied to know the final volume:
[tex]\frac{P1}{T1}[/tex] = [tex]\frac{P2}{T2}[/tex]
rearranging the equation:
P2 = [tex]\frac{P1T2}{T1}[/tex]
putting the values in the equation:
P2 = [tex]\frac{1.01 X 928}{25}[/tex]
P2 = 37. 49 atm
The pressure will reach 37.49 atm or 3823.36 kPa is the pressure when it is thrown in the fire having temperature of 928 degree celsius.
At what time of day are dissolved oxygen levels most likely to be highest?
Answer:
It's C - 6:00PM.
Explanation:
How much energy in Joules is released by burning a cheese ball that raises the temperature of
74.2 g water from 24°C to 41°C? How many Calories is this?
Answer:
1. The heat energy in Joules is 5280.22J
2. The heat energy in calories is 1261.4 calories
Explanation:
Step 1:
Data obtained from the question.
The following data were obtained from the question:
Mass of water (M) = 74.2 g
Initial temperature (T1) = 24°C
Final temperature (T2) = 41°C
Change in temperature (ΔT) = T2 - T1 = 41 - 24 = 17°C
Heat energy (Q) =?
Recall:
Specific heat capacity of water = 4.186 J/g°C
Step 2:
Determination of the energy in Joules.
This is illustrated below:
Q = MCΔT
Q = 74.2 x 4.186 x 17
Q = 5280.22J
Step 3:
Conversion of the heat energy in Joules to calories. This is illustrated below:
4.186 J = 1 calorie
Therefore, 5280.22J = 5280.22/4.186 = 1261.4 calories
5. Which are generally less soluble, compounds with chlorate ions or carbonate ions?
Answer:
Compounds with Carbonate ions are less soluble than the compounds with Chlorate ions.
Explanation:
The reason is that the compounds with carbonate ions have less attraction between positive and negative charges. (Solvation)
how many sex chromosomes would be present in an individual with 80 chromosomes?
A)2
B)1
C)39
D)40
Answer:
D) 40
Explanation:
The number of sex chromosomes in an organism is half the number of chromosomes the individual has.
So if the individual has 80 chromosomes, they’ll have 80/2 =40 sex chromosomes.
Answer:
A)2
Explanation:
liters of a 2.40 M
M
KBr
K
B
r
solution to obtain 3.40 moles of KBr
Answer:
1.42 L
Explanation:
Step 1:
The following data were obtained from the question :
Molarity of KBr = 2.40 M
Mole of KBr = 3.40 moles
Volume of solution =?
Step 2:
Determination of the volume of the solution.
Molarity of solution is simply the mole of the solute per unit volume the of solution. It is given as :
Molarity = mole /Volume
Volume = mole /Molarity
Volume = 3.4/2.4
Volume = 1.42 L
Therefore, the volume of the solution is 1.42 L