Define formula unit mass of a compound. Calculate the formula unit mass of the following compound: (i) Na2CO3.10H2O (ii) CuSO4 [At. mass of Na = 23, C = 12, O = 16, Cu = 63.5, S = 32 u]
Formula unit mass of Na2CO3 = 2×atomic mass of Na+1×atomic mass of C+3×atomic mass of O =2×22.98+1×12.01+3×16 =105.97u Formula unit mass of 10H2O=10×atomic mass of H2O =10×18.02 =180.02u Formula unit mass of Na2CO3.10H2O=105.97+180.02 =285.99u (ii)159.6 g/mol .
