posted by Brandi on .
At a pressure of 103 kPa and a temperature of 22oC, 52.9 g of a certain gas has a volume of 31.5 L. What is the identity of this gas?
Use PV = nRT
I would change 103 kPa to atmospheres, change 22 C to Kelvin (273 + C = Kelvin), and plug in V, solve for n = number of moles.
Then number of moles = grams/molar mass.
You know moles, you know grams, solve for molar mass, then look on the periodic table to find the name of the element. (Note: I have assumed that this is a gas element, it COULD be CO2 or some other gas. But find the molar mass and then we can figure out what to do if it isn't an element.)
how do you find the molar mass