Questions: Part A What is the molecular formula of a compound given the molar mass of the compound is 30.04 gram and the empirical formula is NH?

Solution Steps

First, we need to calculate the empirical formula mass of NH. The atomic masses are approximately:

• Nitrogen (N): 14.01 g/mol
• Hydrogen (H): 1.008 g/mol

The empirical formula mass of NH is: \[ 14.01 + 1.008 = 15.018 \, \text{g/mol} \]

To find the molecular formula, we divide the given molar mass of the compound by the empirical formula mass: \[ \frac{30.04 \, \text{g/mol}}{15.018 \, \text{g/mol}} \approx 2 \]

This result indicates that the molecular formula is two times the empirical formula.

Since the ratio is 2, the molecular formula is: \[ (NH)_2 = N_2H_2 \]

Final Answer