Find the number of molecules in 60.0 g of N2O Nitrous oxide

Home >> Practice Problems
Explanation: 

The N2O is a molecular compund becuase it has more then one  different of atoms of different types elements.

Step 1 : Convert the given mass in grams to the number of moles.Use the formula:

Moles = mass in grams / MM

where MM is the molar mass of the compound .To find the molar mass of N2O , consider the number of atoms of each element in the formula then multiply the number of elements with their atomic masses then finally add all the molecular weight.

Step 2 : Use the avogadro number to convert the moles to number of molecules .We know that 1 mole of any atom,molecule ,molecular compound,formula unit has 6.02 x 1023 atom,molecule,molecular compound or formula unit .

MM of N2O :

there are 2 atoms of N and 1 atom of O in N2O . 

N = 2 X 14 = 28

O = 1 X 16 = 16

28 + 16 = 44 g / mol

Now , convert mass in grams to moles

Moles = 60 / 44 = 1.36

1 mole of N2O = 6.02 x 1023 molecules of N2O

1.36 moles N2O x 6.02 x 1023 molecules of N2O/ 1 moles N2O = 8.2 x 023 molecules of N2O

Answer: 

8.2 x 023 molecules of N2O