The Molar Mass Of Water \left( H_2O \right ] Is 18.0 G/mol 18.0 \, \text{g/mol} 18.0 G/mol . A Sample Of Water Has A Mass Of 18.0 G 18.0 \, \text{g} 18.0 G . How Many Moles Of Water Are Contained In This Sample?A. 1.00 Mole B. 18.0 Moles C. 36.0 Moles D.

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Introduction

In chemistry, the molar mass of a substance is a crucial concept that helps us understand the relationship between the mass of a substance and the number of moles it contains. The molar mass of water, denoted by the chemical formula H2OH_2O, is 18.0 g/mol18.0 \, \text{g/mol}. In this article, we will explore how to calculate the number of moles of water in a sample with a known mass.

Understanding Molar Mass

The molar mass of a substance is the mass of one mole of that substance. It is typically expressed in units of grams per mole (g/mol). The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}, which means that one mole of water has a mass of 18.0 g18.0 \, \text{g}.

Calculating Moles of Water

To calculate the number of moles of water in a sample, we can use the formula:

moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}

In this case, we are given the mass of the sample (18.0 g18.0 \, \text{g}) and the molar mass of water (18.0 g/mol18.0 \, \text{g/mol}). Plugging these values into the formula, we get:

moles=18.0 g18.0 g/mol\text{moles} = \frac{18.0 \, \text{g}}{18.0 \, \text{g/mol}}

Simplifying the Calculation

When we simplify the calculation, we get:

moles=1.00 mol\text{moles} = 1.00 \, \text{mol}

This means that the sample contains 1.00 mole of water.

Conclusion

In conclusion, we have seen how to calculate the number of moles of water in a sample with a known mass. By using the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}, we can easily determine the number of moles of water in a sample. In this case, the sample contains 1.00 mole of water.

Frequently Asked Questions

Q: What is the molar mass of water?

A: The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}.

Q: How do I calculate the number of moles of water in a sample?

A: To calculate the number of moles of water in a sample, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.

Q: What is the relationship between the mass of a substance and the number of moles it contains?

A: The mass of a substance is directly proportional to the number of moles it contains.

Key Takeaways

  • The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}.
  • To calculate the number of moles of water in a sample, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.
  • The mass of a substance is directly proportional to the number of moles it contains.

Further Reading

If you want to learn more about the molar mass of water and how to calculate the number of moles of water in a sample, check out the following resources:

References

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Introduction

In our previous article, we explored the concept of the molar mass of water and how to calculate the number of moles of water in a sample. In this article, we will answer some frequently asked questions related to the molar mass of water and moles of water in a sample.

Q&A

Q: What is the molar mass of water?

A: The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}.

Q: How do I calculate the number of moles of water in a sample?

A: To calculate the number of moles of water in a sample, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.

Q: What is the relationship between the mass of a substance and the number of moles it contains?

A: The mass of a substance is directly proportional to the number of moles it contains.

Q: Can I use the molar mass of water to calculate the number of moles of water in a sample with a mass of 36.0 g36.0 \, \text{g}?

A: Yes, you can use the molar mass of water to calculate the number of moles of water in a sample with a mass of 36.0 g36.0 \, \text{g}. Simply plug the values into the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.

Q: What is the number of moles of water in a sample with a mass of 36.0 g36.0 \, \text{g}?

A: To calculate the number of moles of water in a sample with a mass of 36.0 g36.0 \, \text{g}, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}. Plugging in the values, we get:

moles=36.0 g18.0 g/mol\text{moles} = \frac{36.0 \, \text{g}}{18.0 \, \text{g/mol}}

Simplifying the calculation, we get:

moles=2.00 mol\text{moles} = 2.00 \, \text{mol}

This means that the sample contains 2.00 moles of water.

Q: Can I use the molar mass of water to calculate the number of moles of water in a sample with a mass of 0.18 g0.18 \, \text{g}?

A: Yes, you can use the molar mass of water to calculate the number of moles of water in a sample with a mass of 0.18 g0.18 \, \text{g}. Simply plug the values into the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.

Q: What is the number of moles of water in a sample with a mass of 0.18 g0.18 \, \text{g}?

A: To calculate the number of moles of water in a sample with a mass of 0.18 g0.18 \, \text{g}, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}. Plugging in the values, we get:

moles=0.18 g18.0 g/mol\text{moles} = \frac{0.18 \, \text{g}}{18.0 \, \text{g/mol}}

Simplifying the calculation, we get:

moles=0.01 mol\text{moles} = 0.01 \, \text{mol}

This means that the sample contains 0.01 moles of water.

Conclusion

In conclusion, we have answered some frequently asked questions related to the molar mass of water and moles of water in a sample. We have seen how to calculate the number of moles of water in a sample with a known mass and how to use the molar mass of water to calculate the number of moles of water in a sample with a mass of 36.0 g36.0 \, \text{g} or 0.18 g0.18 \, \text{g}.

Frequently Asked Questions

Q: What is the molar mass of water?

A: The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}.

Q: How do I calculate the number of moles of water in a sample?

A: To calculate the number of moles of water in a sample, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.

Q: What is the relationship between the mass of a substance and the number of moles it contains?

A: The mass of a substance is directly proportional to the number of moles it contains.

Key Takeaways

  • The molar mass of water is 18.0 g/mol18.0 \, \text{g/mol}.
  • To calculate the number of moles of water in a sample, use the formula moles=massmolar mass\text{moles} = \frac{\text{mass}}{\text{molar mass}}.
  • The mass of a substance is directly proportional to the number of moles it contains.

Further Reading

If you want to learn more about the molar mass of water and how to calculate the number of moles of water in a sample, check out the following resources:

References