
Concept explainers
Interpretation: The number of moles of hydrogen gas in the sample needs to be determined.
Concept Introduction:
The ideal gas equation is represented as follows:
Here, P is pressure, V is volume, n is number of moles, R is Universal gas constant and T is temperature of the gas.

Answer to Problem 11RE
12 mol.
Explanation of Solution
Given Information: The volume of hydrogen gas is 77.0 L, pressure is 3.5 atm and temperature is
Calculation:
First convert the given temperature to K as follows:
Thus,
The ideal gas equation is as follows:
On rearranging,
Putting the values,
Thus, the number of moles of hydrogen gas is 12 mol.
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