A sample of a compound contains 30.0 g C and 5.05 g H. Its molar mass is 78.12 g/mol. What is the compound’s molecular formula?

1 answer:

8 0

You seems to look worried so i will answer your question.
The correct answer is C6H6 as it has a molar mass of 73.07 grams per mole and it is the sample of compound that sums up with 78.12 grams per mole.
CH has 13.02 grams per mole.C2H2 has a molar mass of 26.04.

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Answer:

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General Formulas and Concepts:

Gas Laws

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Stoichiometry

Mole ratio
Dimensional Analysis

Explanation:

Step 1: Define

Identify.

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Step 2: Convert

[DA] Set up: $\displaystyle 0.500 \ \text{mole Xe} \bigg( \frac{22.4 \ \text{L Xe}}{1 \ \text{mole Xe}} \bigg)$
[DA] Evaluate: $\displaystyle 0.500 \ \text{mole Xe} \bigg( \frac{22.4 \ \text{L Xe}}{1 \ \text{mole Xe}} \bigg) = 11.2 \ \text{L Xe}$

Topic: AP Chemistry

Unit: Stoichiometry

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