1.

Calculate number of atoms of hydrogen present in5.6g of urea (molar mass of urea 60g mol-1)Also calculate number of atoms of N, C and O

Answer»

Urea is NH2- CO -NH2 ......( M.M = 60 )

No. of moles = Mass / Molar mass ...

Moles = 5.6 / 60 = 0.093 ....

No. of H atoms = N × Moles × 4 .... ( N is the avogadro number ....) ..

No. of H atoms = 0.093 × 4 × 6 × 10^23 ..= 1.116 × 10^23



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