Determine the molecular formula of a compound that has a molar mass of 92.0 g/mol and an empirical formula of NO₂.

Question

Quizplus · Accepted Answer

1. Find the empirical formula molar mass:
N-14, O-16, S-32, U-238, B-10
Empirical formula molar mass = 14+16+32+238+10 = 310 g/mol

2. Calculate the ratio of the actual molar mass to the empirical formula molar mass:
92.0 g/mol ÷ 310 g/mol = 0.2968

3. Multiply the empirical formula by this ratio to get the molecular formula:
N1 × 0.2968 = 0.2968
O1 × 0.2968 = 0.2968
S1 × 0.2968 = 0.2968
U1 × 0.2968 = 70.2256
B12 × 0.2968 = 3.5616

Round the values to the nearest whole number to get the molecular formula: NSB3U70O3S3. 
Thus, the answer is C.

Determine the Molecular Formula of a Compound That Has a Molar