Question:
What is the molar mass of a compound represented below?
What is the molar mass of a compound represented below?
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When calculating the molar mass of a compound, sum the atomic masses of all atoms present in the molecular formula.
Updated On: Mar 28, 2026
- 128 g/mol
- 108 g/mol
- 120 g/mol
- 126 g/mol
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The Correct Option is A
Solution and Explanation
Step 1: Analyzing the compound.
The compound contains an ethyl group (Et) and a methyl group (Me). The structure consists of an ethyl group (C$_2$H$_5$) and a methyl group (CH$_3$) attached to a carbon-carbon chain. The molar mass of the compound is calculated by adding the atomic masses of the constituent atoms.
Step 2: Calculation.
For the ethyl group (Et): \[ \text{Molar mass of Et} = 2 \times 12 + 5 \times 1 = 29 \, \text{g/mol} \] For the methyl group (Me): \[ \text{Molar mass of Me} = 1 \times 12 + 3 \times 1 = 15 \, \text{g/mol} \] For the entire compound: \[ \text{Molar mass of compound} = 29 + 15 + 84 = 128 \, \text{g/mol} \] Step 3: Conclusion.
The correct molar mass of the compound is 128 g/mol, so the correct answer is (A).
The compound contains an ethyl group (Et) and a methyl group (Me). The structure consists of an ethyl group (C$_2$H$_5$) and a methyl group (CH$_3$) attached to a carbon-carbon chain. The molar mass of the compound is calculated by adding the atomic masses of the constituent atoms.
Step 2: Calculation.
For the ethyl group (Et): \[ \text{Molar mass of Et} = 2 \times 12 + 5 \times 1 = 29 \, \text{g/mol} \] For the methyl group (Me): \[ \text{Molar mass of Me} = 1 \times 12 + 3 \times 1 = 15 \, \text{g/mol} \] For the entire compound: \[ \text{Molar mass of compound} = 29 + 15 + 84 = 128 \, \text{g/mol} \] Step 3: Conclusion.
The correct molar mass of the compound is 128 g/mol, so the correct answer is (A).
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