Answer:
The molecular formula is N2H4 (option 3 is correct)
Explanation:
Step 1: Data given
Empirical formula = NH2
Molar mass of the compound = 32.06 g/mol
Atomic mass of N = 14.0 g/mol
Atomic mass of H = 1.01 g/mol
Step 2: Calculate the molar mass of this empirical formula
The empirical formula says for every N atom we have 2H atoms
The molar mass of this empirical formula is:
14.01 + 2*1.01 = 16.03 g/mol
Step 3: Calculate the molecular formula
We have to multiply the empirical formula by n
n = (molar mass of molecular formula / molar mass of empirical formula)
n = 32.06 / 16.03 = 2
Molecular formula = 2*(NH2)
Molecular formula = N2H4
The molecular formula is N2H4 (option 3 is correct)
