CHEMISTRY HIGH SCHOOL

Calculate the number of molecules in 210 grams of H2O

Answers

Answer 1
Answer:

The number of molecules in 210 grams of H₂O is 72.48 x 10²⁴.

What are moles?

The mole is a SI unit of measurement that is used to calculate the quantity of any substance. The number of models of any substance can be calculated by dividing the mass by the molar mass of the substance or compound.

Mole = mass / molar mass

Given the mass of wateris 210 grams

The molar mass of water is 18.01g/mole

The mass and the molar mass will be divided.

210 / 18.01g = 11.653 mole

Now, here 1 mole is 6.22 x 10²³ molecules, so the 6.22 x 10²³ will be multiplied by the 11.653 to get the molecules of 210-gram water.

1 mole has 6.22 x 10²³  molecules

11.653 mole x 6.22 x 10²³ = 72.48 x 10²⁴

Thus, the number of molecules of H₂O is 72.48 x 10²⁴.

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Answer 2
Answer: H2O=18.01g/mole. 210g divided by 18.01g/mole=11.653mole. 1 mole has 6.22x10^23 molecules. So there is 11.653x(6.22x10^23) molecules. Just multiply 11.653 by 6.22. Then put it as answerx10^23 molecules

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Some scientific evidence suggests that our universe is ever-expanding from a hot and dense initial state. Briefly describe at least one piece of evidence that supports the theory known as the Big Bang.

Answers

cosmic microwave background radiation (CMBR) is one piece of evidence for the big bang

Answer:

Cosmic microwave background and Hubble's Law.

Explanation:

Microwave background is basically electromagnetic radiation, but it's the remanent from earlier periods of the universe, they are the oldest electromagnetic wave in the Universe. Also, Hubble's Law says that the Universe faster galaxies are those are further away, because they belong to the first period of the explosion.

What is the length of time an organism is expected to live?

Answers

This is called a life span.

Destiny prefers investments that offer the highest possible returns, even if they are risky. Which of the following bonds is Destiny most likely to be interested in?

Answers

Since Destiny is mostly interested in higher return, he will hence most likely invest in bonds with very high risk rate. Hence, Destiny will most likely be interested in Junk bond.

  • Both Municipal and savings bond are usually backed up by the government as as such they are safer to invest in. However, they have low rate of return.

  • Corporate bonds are usually issued by profit - oriented companies and organizations and have a higher rate of return than municipal and savings bond.

  • Junk bonds are a form of corporate bond with veryhigh level of risk which is compensated by a very high return rate compared to other corporate bonds. There is a higher tendency that companies that issue junk bonds will default on their debt.

Therefore, Destiny will most likely be interested in a Junkbond.

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Options:

- Saving bonds

- Corporate bonds

- Junk bonds

- Municipal bonds

Answer: Junk bonds

A container is filled with 4.0 g H2 and 5.0 02. How much water is produced

Answers

4.0 g water. Water is the limiting reactant. Therefore there will be excess oxygen.

The molar mass of carbon dioxide (CO2) is 44.01 g/mol. The molar mass of water (H2O) is 18.01 g/mol. A reaction uses 528 g of CO2. How many moles of water are used in this reaction?

Answers

The reaction that results from this is:

H2O + CO2 --> H2CO3

Ratio between water and CO2 is 1:1. So we can say that for every Mole of CO2, we need 1 Mole of water to produce 1 Mole of H2CO3. Thus as n=m/M we can find n = 528/44.01 = 11.997 ~ 12Mol.

Therefore, we need 12 moles of water.

Answer:

12 moles

Explanation:

The reaction will form carbonic acid:

CO₂ + H₂O  ⇒   H₂CO₃

For 528 g of CO₂, the number of moles (n) will be:

n = mass/molar mass

n = 528/44.01

n  = 12 moles of CO₂

The stoichiometry is 1 mol of CO₂ reacts with 1 mol of H₂O, so 12 moles of CO₂ need 12 moles of H₂O.

Solids and liquids have both mass and volume, but a gas has only mass.
a. True
b. False

Answers

True. A gas does not have a definite volume. Therefore, making this statement correct. 

Answer:

True. A gas does not have a definite volume. Therefore, making this statement correct.

Explanation:

true
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