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How many mol of CH4 are in a 150 L tank exerting a pressure of 20.0 atm when the temperature is 24.0 degrees Celsius?


1. Recognize the problem as Ideal Gas Law Problem. To help recognize the problem we note the substance is referred to as a gas either implicitly or explicitly and any information in the problem are physical properties of the substance, i.e., pressure, volume, temperature,mol, density, or mass of the gas.

2. Recognize the problem has only one condition, it is a single variable problem.

3. Write the Ideal Gas Equation; PV = nRT

4. Construct a table and assign a value from the problem statement to each of the variables in the Ideal Gas Equation.

5. Convert units of each variable intot he units corresponding to the value of R; 0.0821 L atm mol-1 K-1

6. Substitute the values into the equation and solve for the unknown.

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