How many atoms are in 3.75 mol of calcium?

The volume of a gas is dependent on:

1. Pressure

2. Temperature

3. Amount of gas.

Answer:

Distance = 72 meters.

Explanation:

Given data:

speed of burrito = 4 meter/ second

Time taken in flight = 18 seconds.

Required: The distance covered during this time and having the above speed by the burrito.

Solution :

Formula of speed is given below.

Speed = distance / time interval

By putting the values of speed and time, we get,

4 meter / second = distance / 18 seconds.

Multiply 18 both, we get

4 x 18 = distance

Distance = 72 meters.

The size of volumetric flask is 0.5L = 500mL

Explanation:

In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.

Molarity of a solution is given by;

[tex]M= \frac{n}{V}[/tex]

Where;

n= number of moles of solute

V= volume of solution = size of volumetric flask

[tex]n=\frac{m }{ m.m}[/tex]

Where;

m= mass of solute=43.85g

m.m= molar mass of solute=58.5g

Note that solute is NaCl(s)

[tex]n=\frac{43.85}{58.5}=0.75mol[/tex]

We know that the molarity is 1.50M

To find the size of the volumetric flask, we make V in M=n/V subject of formula

[tex]V=\frac{n}{M}[/tex]

[tex]V=\frac{0.75}{1.50}[/tex]

[tex]V=0.5[/tex]

Therefore, the size of volumetric flask is 0.5L = 500mL.

Final answer:

To prepare a 1.50 M NaCl solution using 43.85 g of NaCl, calculate the moles of NaCl and then divide by the desired molarity, resulting in a volume of 0.500 liters. Therefore, a 500 mL volumetric flask should be used.

Explanation:

To determine what size volumetric flask is needed to create a 1.50 M solution using 43.85 g of NaCl, we first need to calculate the amount of solvent required to achieve this molarity. The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol. To find the number of moles in 43.85 g of NaCl, we divide the mass by the molar mass:

moles of NaCl = 43.85 g / 58.44 g/mol = 0.750 moles

Next, we use the formula for molarity (M), which is moles of solute (n) divided by liters of solution (V). Since we want a 1.50 M solution:

1.50 M = 0.750 moles / V (liters)

Solving for V gives us:

V = 0.750 moles / 1.50 M = 0.500 liters

Thus, a 500 mL volumetric flask is appropriate to prepare this solution, ensuring the final volume accounts for the added volume after the solute has dissolved.

Answer:

3.683×10^21 particles

Explanation:

Number of particles in a substance = (mass of the substance/molar mass of the substance)×Avogadro's number

Given;

Mass of compound =1.45g

Molar mass of compound =237g

Avogadro's number=6.02×10^23

Therefore, number of particles = (1.45/237)×6.02×10^23

=3.683×10^21 particles

Answer:

3.68•10^21 particles (correct to 3SF)

Explanation:

1.45 • xg molecular compound • 1mol/237g • (6.02•10^23)/ 1 mol = 3.6831•10^21 representative particles

*6.02•10^23 is Avagadro's number

Answer: Yes, they have.

Explanation: The frequency, severity, and length of heat waves are increasing. Heat and humidity already kill an average of 1,300 people in the U.S. each year. Deadly heat waves of at least 20 days affect 30% of the earth's population. That will increase to 75% by 2100 if global warming isn't stopped.

Answer:

I think the answer is B

Explanation:

Nuclear energy is usually considered a non-renewable energy source. Although uranium is found in rocks all over the world, nuclear power plants usually use a very rare type of uranium, U-235. Uranium is a non-renewable resource.

Answer:

520.8 mL

Explanation:

We can solve this problem by using Boyle's Law, which states that:

"For a fixed mass of an ideal gas kept at constant temperature, the pressure of the gas is inversely proportional to its volume"

Mathematically:

[tex]p\propto \frac{1}{V}[/tex]

where

p is the pressure

V is the volume

We can rewrite the equation as

[tex]p_1 V_1 = p_2 V_2[/tex]

where here:

[tex]p_1=12.5 psi[/tex] is the initial pressure of the gas

[tex]V_1=750 mL[/tex] is the initial volume

[tex]p_2=18 psi[/tex] is the final pressure

And solving for V2, we find the final volume of the gas:

[tex]V_2=\frac{p_1 V_1}{p_2}=\frac{(12.5)(750)}{18}=520.8 mL[/tex]

In the water cycle, the stage following evaporation is condensation. This process involves water transforming from a gas back into a liquid form in the atmosphere, eventually leading to precipitation.

In the water cycle, the stage that occurs after evaporation is condensation. After water evaporates from the earth's surface, it rises into the atmosphere where cooling temperatures cause it to change from a gas (steam) back into a liquid form, creating clouds.

This is the process of condensation. It's important to note that the water cycle is a continual process, and after condensation, the cycle usually moves on to precipitation, where the condensed water falls back to the earth as rain, sleet, or snow.

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Answer:

A

Explanation:

Menthol (M 156.3 g/mol), the strong-smelling substance in many cough drops, is a compound of carbon, hydrogen, and oxygen. When 0.1595 g of menthol was bunted in a combustion apparatus. 0.449 g of CO_2 and 0.184 g of H_2 O formed.

Answer:

Now molecules:

(2) molecules of H 2 +  (1) molecules of O 2 → (2) molecules of H 2 O

Explanation:

i just got the answer correct

The question involves a basic chemical reaction in Chemistry. Two molecules of hydrogen and one molecule of oxygen combine to form two molecules of water.  It shows the process of a balanced chemical equation.

The question provided involves a basic chemical reaction, in which hydrogen (H2) and oxygen (O2) molecules combine to create water (H2O). This process is an example of a balanced chemical reaction, in accordance with the law of conservation of matter that requires the total number of atoms for each element to remain the same before and after a reaction. Essentially, 2 molecules of hydrogen (H2) and 1 molecule of oxygen (O2) will combine to form 2 molecules of water (H2O)

This can be represented as: 2H2 + O2 → 2H2O. This means, two hydrogen molecules (each containing 2 hydrogen atoms) react with one molecule of oxygen (containing 2 oxygen atoms) to form two molecules of water (each containing 2 hydrogen atoms and 1 oxygen atom).

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76.6 litres is the volume of the gas if pressure and temperature changes to STP.

Explanation:

Data given:

Volume of the gas V1 = 15.9 litres

pressure of the gas P1 = 589 kPa or 5.81 atm.

temperature T1 = 56.5 degrees or 329.3 K

Final pressure P2 = 101.3 kPa

Final temperature T2 = 273 K

At STP the pressure is 1 atm or 101.3 kPa and the temperature is 273 K. So from the question the final temperature and pressure is at STP.

from Gas Law:

[tex]\frac{P1V1}{T1}[/tex]  =  [tex]\frac{P2V2}{T2}[/tex]

V2 = [tex]\frac{P1V1T2}{P2T1}[/tex]

Putting the values in  the above rearranged equation of Gas Law:

V2 = [tex]\frac{589 X 15.9 X 273}{329.3X 101.3}[/tex]

    = 76.6 Litres

If the pressure and temperature change to STP, the new volume will be "76.6 liters".

According to the question,

Initial pressure, P₁ = 589 kPa or,

                              = 5.81 atm

Final pressure, P₂ = 101.3 kPa

Initial volume, V₁ = 15.9 L

Initial temperature, T₁ = 56.5° or,

                                    = 329.3 K

Final temperature, T₂ = 273 K

By using the Gas law,

→ [tex]\frac{P_1 V_1}{T_1} =\frac{P_2 V_2}{T_2}[/tex]

or, the new volume be:

→ V₂ = [tex]\frac{589\times 15.9\times 273}{329.3\times 101.3}[/tex]

       = 76.6 L

Thus the above approach is correct.

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Answer:

A

Explanation:

Answer:

Increasing the mass of an object will decrease the acceleration, because of Newton's Second Law (the acceleration of an object increases with increased force,  decreases with increased mass, and moves the same direction as the force).

Answer:

i think it's eutrophication

Lakes can disappear due to Eutrophication, which is a biological process where a buildup of nutrients causes rapid plant growth. When these plants die and decompose, the oxygen in the water is consumed, leading to the disappearance of the lake over time.

Lakes can disappear due to various natural phenomena, but particularly due to Eutrophication. This is a biological process, where a buildup of nutrients can cause rapid plant growth, particularly algae, in the lake. As these plants die and decompose, bacteria thrive and consume oxygen in the water, thereby making it uninhabitable for aquatic life. Continued eutrophication can eventually lead to a lake losing its water and becoming a marsh or dry land.

Condensation, Transpiration, and Photosynthesis do not directly contribute to the disappearance of lakes, as these processes are part of the water cycle and the energy balance in ecosystems, respectively.

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When the DNA changes from AGT TAC CCG ATT to AGT TAG CCC GAT,

Translocation occur.

a type of genetic alteration when a segment of one chromosome separates and joins another. Chromosomes from different species can occasionally swap portions with one another.

Deoxyribonucleic acid (DNA) exists an organic chemical that contains genetic information and teachings for protein synthesis. It exists located in most cells of every organism. DNA exists as a key part of reproduction in which genetic heredity happens via the passing down of DNA from parent or parents to offspring.

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Answer:

A magnet moved near a coil of wire can cause a(n)  electric current to flow. (The magnet's magnetic field also moves.)

Explanation:

The answer is A.

Answer:

CHAPTER 17

PROPERTIES OF SOLUTIONS

Solution Composition

12. Mass percent: the percent by mass of the solute in the solution.

Mole fraction: the ratio of the number of moles of a given component to the total number of

moles of solution.

Molarity: the number of moles of solute per liter of solution.

Molality: the number of moles of solute per kilogram of solvent.

Volume is temperature-dependent, whereas mass and the number of moles are not. Only

molarity has a volume term, so only molarity is temperature-dependent.

13. a. HNO3(l) → H+

(aq) + NO3

−

(aq) b. Na2SO4(s) → 2 Na+

(aq) + SO4

2−

(aq)

c. Al(NO3)3(s) → Al3+(aq) + 3 NO3

−

(aq) d. SrBr2(s) → Sr2+(aq) + 2 Br−

(aq)

e. KClO4(s) → K+

(aq) + ClO4

−

(aq) f. NH4Br(s) → NH4

+

(aq) + Br−

(aq)

g. NH4NO3(s) → NH4

+

(aq) + NO3

−

(aq) h. CuSO4(s) → Cu2+(aq) + SO4

2−

(aq)

i. NaOH(s) → Na+

(aq) + OH−

(aq)

14. Mol Na2CO3 = 0.0700 L ×

L

3.0 mol Na 2CO3 = 0.21 mol Na2CO3

Na2CO3(s) → 2 Na+

(aq) + CO3

2−

(aq); mol Na+

= 2(0.21) = 0.42 mol

Mol NaHCO3 = 0.0300 L ×

L

1.0 mol NaHCO3 = 0.030 mol NaHCO3

NaHCO3(s) → Na+

(aq) + HCO3

−

Final answer:

The correct list of reaction intermediates is A)(CH3)3AuPH3, (CH3)3Au, and (CH3)Au.

Explanation:

The correct list of reaction intermediates from the given reaction pathway is:

A)(CH3)3AuPH3

,

(CH3)3Au

, and

(CH3)Au

This can be determined by examining the steps of the reaction pathway. In step 1, (CH3)3AUPH3 is converted into (CH3)3Au and PH3. In step 2, (CH3)3Au reacts to form (CH3)Au and C2H6. Finally, in step 3, (CH3)Au reacts with PH3 to form (CH3)AuPH3. Therefore, the intermediates are (CH3)3AuPH3, (CH3)3Au, and (CH3)Au.

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In the provided chemical reaction pathway, the intermediates are (CH3)3Au and (CH3)Au as they are produced in a step and consumed in a later step. This makes option D correct.

In a chemical reaction, intermediates are substances that form during the reaction but are consumed before it's completed. Here, judging from the three-step reaction pathway you've been provided:

The intermediates can be identified as the molecules that are produced in one step and consumed in a later step. Based on this, the correct list of reaction intermediates from this reaction pathway is (CH3)3Au, because it is produced in step 1 and consumed in step 2 and (CH3)Au, because it is produced in step 2 and consumed in step 3. So, option D.) PH3, (CH3)3Au, and (CH3)Au is correct.

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Answer:

C

In an exothermic reeaction, the energy of products is less than the energy of reactants.

Explanation:

Answer:

In an exothermic reeaction, the energy of products is less than the energy of reactants.

Explanation:

Answer:

I don't know what?

Explanation:

Answer:

They don’t grow from a tree

Explanation:

They grow from a root system that produces an a over ground structure resembling a stalk

the banana tree is technically an herbaceous plant

Answer:

Q = 25.6 j

Explanation:

Given data:

Energy needed= ?

Mass of lead = 10.0 g

Initial temperature = 30 °C

Final temperature = 50°C

Cp = 0.128 j/g.°C

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 50°C - 30°C

ΔT = 20°C

Now we will put the values in formula.

Q = 10 g × 0.128 j/g.°C × 20°C

Q = 25.6 j

Answer:

Weigh 80g of Sodium chloride and dissolve it in 100ml of water.

Explanation:

The formula for weight percent (w/v) is: [Mass of solute (g) / Volume of solution (ml)] x 100. This is used to prepare a solution of a solid in a liquid.

To prepare 80% solution of sodium chloride in water, 80g of sodium chloride is dissolved in 100ml of water according to the formula above. 80g of sodium chloride is measured in an appropriate weighing balance and carefully transferred to a standard flask and made up to the 100ml mark.

Answer:

Oxygen and 0.36

Explanation:

Oxygen is usually always in excess and you use the math to find the 0.36

Answer:

(H30+) = 3,98 x10 ^-11  M

Explanation:

The pH gives us an idea of the acidity or basicity of a solution. More precisely, it indicates the concentration of H30 + ions present in said solution. The pH scale ranges from 0 to 14: from 0 to 7 corresponds to acid solutions, 7 neutral solutions and between 7 and 14 basic solutions. It is calculated as:

pH = -log (H30 +)

We solve (H30+) and calculate:

(H30+) = antilog - pH

(H30+) = antilog - 10.4

(H30+) = 3,98 x10 ^-11  M

Answer:

There is no image

Explanation:

Answer:

0.143L

Explanation:

Molar mass of H2SO4 = 98g/Mol

No of mole = mass/molar mass

No of mole= 49/98 = 0.5 mol

No of mol = concentration × volume

Volume = n/C = 0.5/3.5 = 0.143L

Answer:

v=2010 inches^3

Explanation:

The volume of a cylinder can be found using:

[tex]v=\pi r^2h[/tex]

We know the height is 10, the radius is 8, and we can substitute 3.14 in for pi

v=3.14(8^2)(10)

Solve the exponent first

v=3.14(64)(10)

v=3.14(640)

v=2009.6

To the nearest whole number:

v=2010 inches^3

In the Venn Diagram:

- "DNA replicates" goes under "Cell divides once".

- "4 Daughter cells" is placed under "Cell divides twice".

- "Growth and repair" can be in the overlap of "Asexual Reproduction" and "Both Sexual Reproduction".

In the Venn Diagram:

- "DNA replicates" would go under the category "Cell divides once" as DNA replication typically occurs before cell division.

- "4 Daughter cells" would be placed under the category "Cell divides twice" as it indicates a cell division process resulting in four daughter cells.

- "Growth and repair" can be placed in the overlapping space of "Asexual Reproduction" and "Both Sexual Reproduction" as both types of reproduction involve growth and repair processes.

The probable question maybe:

Listed in the Item Bank are some key terms and expressions associated with the categories seen in the Venn Diagram. To find out more information about items, some have more details available when you click on them. Drag and drop each item onto the proper area of the diagram. If an item describes more than one category, be sure to place it in the overlapping space. ITEMBANK: Move to Bottom 2 Daughter cells DNA replicates 4 Daughter cells Cell divides once Cell divides twice Growth and repair Asexual Reproduction Both Sexual Reproduction drag and drop answer here drag and drop answer here drag and drop answer here