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Question

The percentage of carbon inCO2 is:


A

0.034%

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B

27.27%

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C

3.4%

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D

28.7%

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Solution

The correct option is B

27.27%


The explanation for the correct option

(B)27.27%

Step1. The formula for mass percentage

Mass%ofanelement=massofthatelementinthecompound×100molarmassofthecompound

Step 2. Calculation of percentage of carbon inCO2

  • The molar mass of CO2=12+2×16g=44g
  • Mass%ofanelement=1244×100=27.27%
  • So, the mass percentage of carbon inCO2 is 27.27%.

The explanation for incorrect options

The mass percentage of carbon inCO2 is 27.27%. Hence, options (A), (C), and (D) are incorrect.

Hence, option (B) is correct. The mass percentage of carbon inCO2 is 27.27%.


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