Question:
A 13 g gaseous sample of an unknown hydrocarbon occupies a volume of 11.2 L at STP. What is the hydrocarbon?
A 13 g gaseous sample of an unknown hydrocarbon occupies a volume of 11.2 L at STP. What is the hydrocarbon?
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Use molar volume of gas at STP (22.4 L/mol) to estimate molar mass and identify unknown gases.
Updated On: Mar 30, 2025
- CH
- C$_2$H$_4$
- C$_2$H$_2$
- C$_3$H$_3$
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The Correct Option is C
Solution and Explanation
At STP, 1 mole of any ideal gas occupies 22.4 L. Moles = 11.2 / 22.4 = 0.5 mol. Molar mass = 13 / 0.5 = 26 g/mol. C$_2$H$_2$ has a molar mass of 26 g/mol.
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