Given that the molar mass of NH_3 is 17.03 g/mol, how many moles of NH_3 are present in a 107.1 g sample?

• A. 0.159 moles
• B. 1.59 moles
• C. 9.32 moles
• D. 6.29 moles

Answer: (D)

Verified step by step guidance

1. Identify the given information: the mass of the NH_3 sample is 107.1 g, and the molar mass of NH_3 is 17.03 g/mol.
2. Recall the formula to calculate moles from mass and molar mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
3. Substitute the given values into the formula: \(\text{moles} = \frac{107.1}{17.03}\).
4. Perform the division to find the number of moles of NH_3 in the sample.
5. Compare your calculated value with the provided answer choices to select the correct number of moles.