Homework Answers
a)
Molar mass of C10H8,
MM = 10*MM(C) + 8*MM(H)
= 10*12.01 + 8*1.008
= 128.164 g/mol
Lets calculate the mass of element
mass of C = 10*MM(C)
= 120.1 g
Mass % of C = (120.1*100)/128.164
= 93.71 %
b)
Molar mass of C14H10,
MM = 14*MM(C) + 10*MM(H)
= 14*12.01 + 10*1.008
= 178.22 g/mol
Lets calculate the mass of element
mass of C = 14*MM(C)
= 168.14 g
Mass % of C = (168.14*100)/178.22
= 94.34 %
Percentage carbon is more in case of a
Answer: a
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