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Unless the OP is being cute and using weight for the former and volume for the latter instead of the common and well accepted dual definition as a unit of volume (oz, gallon, etc.) , then it's just a simple units conversion and in all probability, his or her homework.
Poor fellow wants to know what the volume of a mole of (assume air) might be ;-?
Uh oh! Cannot compute, since this question contains a contradiction.
Temperature is 273.15 K = 0 C = 32 F,
and pressure is 100 KPa = 14.5 lb*in^-2 = 0.9869 atm.
So if you say the pressure is some other number, then that means its not STP, and that's a contradiction.
Also, an ounce is not a unit of pressure, unless you mean 1 ounce per square inch, which I guess is 1/16 of a pound per square inch.
You might be thinking of that proverb about the idea gas. One mole of an ideal gas, at STP, has a volume of 22.4 liters = 22.4*10^-3 cubic meters.
Or maybe you're wondering how much volume necessary to hold a 1 ounce mass, or weight, of some kind of gas? The answer that depends on the density of the gas, and you can estimate that from the ideal gas approximation, if you know the molecular mass (also called molecular weight) of the gas.
The molecular mass of dry air is about 33.6 grams per mole. 1 ounce of air is 28.3 grams of air, or (28.3 g)*(mol/33.6g) = 0.842 mol, which occupies a volume of (0.842 mol)*(22.4 L/mol) = 18.9 L = 18.9 liters = 18.9*10^-3 m^3, at STP.
Why are you mixing english and metric measurements?
STP stands for standard temperature and pressure
Standard temperature is defined as zero degrees Celsius (0 0C), which translates to 32 degrees Fahrenheit (32 0F) or 273.15 degrees kelvin (273.15 0K). This is essentially the freezing point of pure water at sea level, in air at standard pressure.
Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg). This is about 29.9 inches of mercury, and represents approximately 14.7 pounds per inch (14.7 lb/in2). Imagine a column of air measuring one inch square, extending straight up into space beyond the atmosphere. The air in such a column would weigh about 14.7 pounds.
SO, based on the definition of STP your question makes no sense. STP is 14.7 Pounds per square inch. What does does one ounce have to do with it? And what does cubic meters have to do with it?
Google is your friend and while at it you might want to specify what gas you are talking about.
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Posted:Aug 14, 2015
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