Question

What is the molecular formula of a compound if its empirical formula is NO2 and its molar mass is 138.02 g/mole?

Answer 1

let (NO2)n be the molecular formula,
(14+16x2)n=138.02
n=3
molecular formula: (NO2)3=N3O6

Answer 2

The molecular formula is N3O6

Step-by-step explanation:

The empirical formula of the compound is NO2

Now, find the number of empirical units in each mole of compound a. The empirical mass of the compound is found by adding one mole of nitrogen (14.0067 g/mol), and two moles of OXYGEN (16.00 g/mole). Compare this to given molar mass to determine the whole-number multiplier.

(1*14.0067 g) +(2*16.00 g) = 46.0067 g/ emp.unit

a = 138.02 g/mole/ 46.0067 g/ emp.unit

= 2.99≈3

The molecular formula is NO2 *3= N3O6