Chemistry
posted by Help please on .
I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do them. I really need help please, There all due tomarrow.
A 2.00L flask is filled with propane gas(C3H8)at 1.00atm and 15C. What is the mass of propane in the flask?

Use PV = nRT.
Remember T is in kelvin. Solve for n = number of moles.
Then n = grams/molar mass 
Im still not understanding.
:( 
Just follow the instructions. I explained R above from your earlier question.
You have P in atmospheres (1 atm), you have Volume (2.00 L), you know R = 0.08206 and T = 273 + 15 = 288 Kelvin.
Solve for n = number of moles.
Then moles = grams/molar mass
You have moles and you have molar mass of propane (about 44 but you need to confirm that), solve for grams. 
LORD! I hate chemisty