A balloon contains 11.1 g of nitrogen monoxide gas (NO). how many molecules are in the balloon?

The number of molecules that are in balloon are = 2.227 x10^23 molecules

calculation

calculate the number of moles of NO

moles = mass/molar mass

molar mass of NO = 14 + 16 = 30 g/mol

moles is therefore = 11.1 g/30g/mol = 0.37 moles

by use of Avogadro's constant that is

1 mole = 6.02 x10^23 molecules

0.37 = ? molecules

= (6.02 x10^23 x 0.37 moles) / 1mole=2.227 x10^23 molecules