mheducation.com/hm.tpx Question 18 (of 28) value 10.00 points 5 attempts left Ch

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mheducation.com/hm.tpx Question 18 (of 28) value 10.00 points 5 attempts left Check my work Be sure to answer all parts. Ciamamie alehol is used nalaly in perftumery. particularly in soap and cosmetics Is molecular ainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is CoH100 (a) Calculate the percent composition by mass of C, H, and O in cinnamic alcohol. (b) How many molecules of cinnamic alcohol are contained in a 0.391-g sample? 10 molecules Enter your answer in scientific notation)

Explanation / Answer

molecular formula of alcohol is C9H10O.

atomic weights : C=12, H=1 and O=16

Molar mass of C9H10O= 9*12+10*1+16= 108 (C)+ 10(H)+ 16(O)= 134 g/mole

Basis : 1 mole of alcohol, moles= mass/molar mass

for 1 mole, mass = molar mass =134 gm

mass of C=108 gm, H=10gm, O=16 gm

mass % = 100*(mass of substance/total mass)

mass % : C= 100*108/134= 80.59%, H= 100*10/134 = 7.46 and O= 100*16/134= 11.94%

2. Moles = mass/molar mass, mole of alcohol= 0.391/134 =0.00292

1 mole of any substance contains 6.023*1023 molecules

0.00292 moles of substancecontain 0.00292*6.023*1023 molecules =1.75*1021 molecules

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