Question

Calculate the number of moles and molecules in 19.6 grams of H2SO4. Also calculate the number of oxygen atoms. 1 mole=6.022*10ˆ23.

Answer 1

Molecular weight of H2SO4 = 98 g/mol

20 g of H2SO4 = 20 /98 ≈ 0.20 moles

1 mole = 6.023 × 10^23 molecules

0.20 moles =12.046 × 10^22 molecules

One molecule of H2SO4 has 4 oxygen atoms,

therefore ;

Number of oxygen atom in 0.2 mole = 4 × 12.046 × 10^22

= 48.184 × 10^22