Question

A compound consists of 81.7 percent by mass carbon and 18.3 percent by mass hydrogen What is the empirical formula of this compound?

Answer 1

Answer: C3H8 ——-

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Answer 2

The empirical formula of the compound containing 81.7% carbon and 18.3% hydrogen is C₃H₈

Data obtained from the question

• Carbon = 81.7%
• Hydrogen = 18.3%
• Empirical formula =?

How to determine the empirical formula

Divide by their molar mass

C = 81.7 / 12 = 6.8

H = 18.3 / 1 = 18.3

Divide by the smallest

C = 6.8 / 6.8 = 1

H = 18.3 / 6.8 = 2.69

Multiply by 3 to express in whole number

C = 1 × 3 = 3

H = 2.69 × 3 = 8

Thus, the empirical formula of the compound is C₃H₈

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