Question:
What is the difference in molar masses of Undecane and Decane?
What is the difference in molar masses of Undecane and Decane?
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Successive members of an alkane series differ by a methylenyl group ($-\text{CH}_2$), which weighs 14 units.
Updated On: May 7, 2026
- 140 g mol$^{-1}$
- 70 g mol$^{-1}$
- 24 g mol$^{-1}$
- 14 g mol$^{-1}$
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The Correct Option is D
Solution and Explanation
Step 1: Formula
Alkanes follow the general formula $C_nH_{2n+2}$.
Step 2: Identification
- Decane: $n = 10 \to C_{10}H_{22}$
- Undecane: $n = 11 \to C_{11}H_{24}$
Step 3: Analysis
The difference between any two consecutive members of a homologous series is a $-\text{CH}_2$ unit.
Mass of $-\text{CH}_2 = 12 + 2 = 14 \text{ g/mol}$.
Final Answer: (D)
Alkanes follow the general formula $C_nH_{2n+2}$.
Step 2: Identification
- Decane: $n = 10 \to C_{10}H_{22}$
- Undecane: $n = 11 \to C_{11}H_{24}$
Step 3: Analysis
The difference between any two consecutive members of a homologous series is a $-\text{CH}_2$ unit.
Mass of $-\text{CH}_2 = 12 + 2 = 14 \text{ g/mol}$.
Final Answer: (D)
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