Question

9. Calculate the percent composition of the following compounds: (a) Na20 (b) Na2CO3 10. Which of the following hydrocarbon contains greater percentage of carbon by mass? (a) naphthalene, C10Hs and (b) anthracene, C14H1o.

Answer 1

Answer) Atomic weight of Na - 23 U OR 23 g/mol Atomic weight of O = 160 OR 16 g/mol Atomic weight of C = 12 u OR 12 g/mol How, Molar mass of Na2O = (2x2 3 + 1x160 g/mol = (46 + 16) g/mol - 62 g/mol |% of Na Alomic weight of Max no. of aloms of NQ X100 molas mass of Nazo (23x2)(mot) x100 = 74.19% 62 mos % of 0 - Atomic weight of ox no. of atoms ofo x100 molar mass of Na2O = 1x 16 fligg) x 100 = 25.80% 62 Glo) Molar mass of Na₂CO₃ = (2x23 + 1x12 + 3x16) g/mol - (46 +12+ 48 ) glmos = 106 g/mol → % of na = 2823 106 X100 = 43.4%. 04 e 2 1*12 106 x 100 = 11.32% % ofo 3x16 106 3x06 100 = 45.28 % 0 - 45.28% {note - According to HomeworkLib policy we have to solve Only 1st questions