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Chapter 3: Q3.142CP (page 138)

Methane and ethane are the two simplest hydrocarbons. What is the mass % C in a mixture that is 40.0% methane and 60.0% ethane by mass?

Short Answer

Expert verified

The mass % of C in a mixture is 77.8% C.

Step by step solution

01

Calculating the mass from C (CH4) 

It can be denoted as,

Mass of C (from CH4)=40 g CH4×1 mol CH416.05 g CH4×1 mol C1 mol CH4×12.01 g C1 molC=29.9 g C

02

Calculating the mass from C (C2H6)

It can be denoted as,

Mass of C (from C2H6)=60 g C2H6×1 mol C2H630.08 g C2H6×2 mol C1 molC2H6×12.01 g C1 molC=47.9 g C

03

Calculating the mass percent of C

The mass percent in the mixture can be denoted as,

Mass % of C=29.9 g C+47.9 g C100 g mixture×100Mass % of C=77.8% C

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