11.What percent of hydrogen (H) is present in ethane(C2H6)? a. 20.18% b. 20.15% c. 20. 13% d. 20
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11.What percent of hydrogen (H) is present in ethane(C2H6)? a. 20.18% b. 20.15% c. 20. 13% d. 20
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11. ()
(26)?
:
. 20.15%
:
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[tex]\tt{\huge{\red{Solution:}}}[/tex]
Step 1: Calculate the molar mass of C₂H₆.
Note that the molar masses of C and H are 12.01 g and 1.008 g, respectively.
[tex]\begin{aligned} \text{molar mass of} \: \text{C}_2\text{H}_6 & = \text{2(12.01 g) + 6(1.008 g)} \\ & = \text{30.068 g} \end{aligned}[/tex]
Final Step: Solve for the percentage of H in C₂H₆.
[tex]\begin{aligned} \%\text{H} & = \frac{n \times \text{molar mass of H}}{\text{molar mass of} \: \text{C}_2\text{H}_6} \times 100\% \\ & = \frac{6 \times \text{1.008 g}}{\text{30.068 g}} \times 100\% \\ & = \boxed{20.11\%} \end{aligned}[/tex]
Hence, the answer is D. 20.11%
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Note: The value of n in the formula of percent composition is the subscript of each element in the compound. If there is no subscript, it means that the value of n is 1.
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