![]() ![]() There are several ways that Equation 4.11 can be used. Hint: What was the number of significant figures in the mass of methane? This result is expressed in only 3 digits, although it can be calculated to more. The molecular weight of methane is about 16.04, which is composed of one atom of carbon with an atomic mass of 12.00 amu and 4 atoms of hydrogen with atomic masses of 1.01 amu:Ĭhecking for dimensional consistency, we see that lb mol cancels with lb mol, atm cancels with atm, and °R cancels with °R, leaving only ft 3, which is the appropriate unit for our answer of 18.5 cubic feet. Finally, we can substitute the values previously determined into the rewritten equation to calculate the volume.Īs outlined above, we must calculate the number of pound moles in 11.0 lbs of methane. Fifth, we must select the appropriate ideal gas constant and use it with a rewritten form of Equation 4.11 to determine the volume of 11.0 lbs of methane gas. Third, we must convert temperature in degrees Fahrenheit into absolute degrees Rankin and, fourth, convert pressure from psig into psia. In a second step, after establishing a basis, we must convert the mass of methane that will be the basis into pound moles. First, we must determine the question, which is to calculate the volume of a quantity of gas at a given temperature and pressure. There are several steps involved in this calculation. Example 4.2 Volume of 11.0 Pounds of Methane at 80☏ and 200 psigĬalculate the volume of 11.0 lbs of methane gas at 200 psig pressure and 80☏. ![]()
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