MCAT General Chemistry Question 60: Answer and Explanation

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Question: 60

15. What is the molecular formula of a compound with an empirical formula of B₂H₅ and a molar mass of

A. B₂H₅
B. B₃H₇
C. B₄H₁₀
D. B₆H₁₅

Correct Answer: C

Explanation:

The simplest approach is to determine the molar mass of the empirical formula. B₂H₅ has a molar mass of A molecular formula is simply a multiple of the empirical formula; doubling this quantity will result in the molar mass given in the question stem. Therefore, the compound must be B₄H₁₀.

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