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19. Calculate number of atoms of hydrogen present in 5.6 g of urea (molar mass of urea= 60g mol-1). Also calculate number of atoms of N, C and O. |
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Answer» Urea = NH2CONH2 M.wt = 60 5.6 g urea = 5.6/60 = 0.093 moles 1 mole of urea contains 4N atoms of H 0.093 moles contains 0.093 x 4N atoms of H = 2.24 x 10^23 atoms of H No of atoms of Nitrogen = half of the number of atoms of H = 1.12 x 10^23 atoms of N No of atoms of C or O = half of the number of atoms of N = 0.56 x 10^23 atoms of C or O = 5.6 x 10^22 atoms of C or O |
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