Molecules or moles? And in a cubic foot of what? Air?
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To determine the number of moles of nitrogen and oxygen in a given volume like a cubic foot, you would first need to know the pressure and temperature of the gas. Then you can use the ideal gas law equation, PV = nRT, where P is pressure, V is volume, n is moles, R is the ideal gas constant, and T is temperature. So without knowing the pressure and temperature, it is not possible to determine the number of moles of nitrogen and oxygen in a cubic foot.
1 cubic foot is equal to 1 cubic foot.
To convert liquid oxygen to gaseous oxygen, you can use the ideal gas law equation PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature. Liquid oxygen has a density of about 1.14 g/mL, so one gallon (3.79 L) would be approximately 4.32 kg. Given the conditions (such as pressure and temperature), you can calculate the volume of gaseous oxygen produced.
There are approximately 0.028 cubic meters in a cubic foot.
144 cubic inches are in 1 cubic foot.
There are 1,728 cubic inches in a cubic foot because a cubic foot contains 12 inches in each dimension (length, width, height), so 12 x 12 x 12 = 1,728 cubic inches.