1.- Cinnamicalcohol is used mainly in perfumery. Particularly in soapsand cosmet

Question

1.- Cinnamicalcohol is used mainly in perfumery. Particularly in soapsand cosmetics. Its molecular formula isC9H10O a) Calculate the % composition by mass of C, H and O incinnamic alcohol. b)How many molecules of cinnamic alcohol arecontained in a sample of mass 0.469 g? 1.- Cinnamicalcohol is used mainly in perfumery. Particularly in soapsand cosmetics. Its molecular formula isC9H10O a) Calculate the % composition by mass of C, H and O incinnamic alcohol. b)How many molecules of cinnamic alcohol arecontained in a sample of mass 0.469 g?

Explanation / Answer

(a)molecular formula of Cinnamic alcohol isC9H10O Mol.wt. of Cinnamic acid = 9 ( 12 ) + 10 ( 1 ) + 16 = 134g 134 g of C9H10O has = 9 * 12= 108 g of C 134 g of  C9H10O has = ( 108 / 134 ) * 100                                     = 80.60 % composition by mass of C is 80.60 % 134 g of C9H10O has =10 * 1=10 g of  H 134 g of  C9H10O has = ( 10 / 134 ) * 100                                     = 7.46 % composition by mass of H is 7.46 % 134 g of C9H10O has = 9 * 12= 16 g of O 134 g of  C9H10O has = ( 16 / 134 ) * 100                                     = 11.94 % composition by mass of O is 11.94 % (b) 134 g of C9H10O has =10 * 1=10 g of  H 134 g of  C9H10O has = ( 10 / 134 ) * 100                                     = 7.46 % composition by mass of H is 7.46 % 134 g of C9H10O has = 9 * 12= 16 g of O 134 g of  C9H10O has = ( 16 / 134 ) * 100                                     = 11.94 % composition by mass of O is 11.94 % (b) 134 g of C9H10O has = 9 * 12= 16 g of O 134 g of  C9H10O has = ( 16 / 134 ) * 100                                     = 11.94 % composition by mass of O is 11.94 % (b)

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