how many moles of o2 are there in 19.68

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24-01-2025

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How Many Moles of O₂ Are There in 19.6 g?

This question requires a basic understanding of molar mass and the mole concept in chemistry. Let's break down how to calculate the number of moles of oxygen (O₂) in 19.6 g.

Understanding Moles and Molar Mass

A mole is a fundamental unit in chemistry, representing Avogadro's number (approximately 6.022 x 10²³) of particles (atoms, molecules, ions, etc.). Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Calculating Moles of O₂

1. Find the molar mass of O₂: Oxygen gas (O₂) is a diatomic molecule, meaning it consists of two oxygen atoms. The atomic mass of oxygen is approximately 16 g/mol. Therefore, the molar mass of O₂ is 2 * 16 g/mol = 32 g/mol.

2. Use the formula: The number of moles (n) can be calculated using the following formula:

   n = mass (g) / molar mass (g/mol)

3. Plug in the values: We have a mass of 19.6 g and a molar mass of 32 g/mol. Substituting these values into the formula:

   n = 19.6 g / 32 g/mol

4. Calculate the number of moles: Performing the calculation:

   n ≈ 0.6125 mol

Therefore, there are approximately 0.6125 moles of O₂ in 19.6 g of O₂.

Important Considerations:

• Significant figures: The given mass (19.6 g) has three significant figures. Our answer should reflect this, so we round the result to three significant figures.

• Units: Always pay attention to units. Ensuring consistent units throughout your calculation is crucial for obtaining the correct answer. The grams cancel out, leaving moles as the unit for the answer.

• Gas Laws: This calculation assumes the oxygen is in its standard gaseous state. Under different conditions (e.g., high pressure, low temperature), the volume and behavior of the gas would change, but the number of moles would remain the same.

This explanation provides a clear and concise method for calculating moles, including the necessary context and considerations. Remember to always double-check your work and ensure you understand the underlying concepts.