Question

A colourless liquid whose empirical formula is NO2 has a molecular mass 92. What is the molecular formula

Answer 1

Given that  

A colorless liquid whose empirical formula is NO2 has a molecular mass 92.

 

Now calculate the formula amass of NO2=  

Mass of N + 2*mass of O

= 14+2*16) g/ mole

= 46 g/ mole

Number of empirical unit = molecular mass / formula mass

= 92 g/ mole /46 g/ mole  

=2

There molecular formula = 2* NO2

= N2O4

Answer 2

empirical formula= NO2

Empirical formula wt. = 14+32=46

n=Empirical formula wt. = 92 =2

Molecular formula wt. 46

Molecular formula= N2O4