Given that a sample of an element has a mass of 10.4 grams and contains 0.129 moles, what is the molar mass of the element?

• A. 134 g/mol
• B. 1.24 g/mol
• C. 80.6 g/mol
• D. 10.4 g/mol

Answer: (C)

Verified step by step guidance

1. Identify the given information: the mass of the sample is 10.4 grams and the amount of substance is 0.129 moles.
2. Recall the formula for molar mass, which relates mass and moles: \(\text{Molar Mass} = \frac{\text{Mass}}{\text{Moles}}\).
3. Substitute the given values into the formula: \(\text{Molar Mass} = \frac{10.4\ \text{g}}{0.129\ \text{mol}}\).
4. Perform the division to find the molar mass in grams per mole (g/mol).
5. Compare the calculated molar mass with the provided options to confirm the correct answer.