Question

what is the mass of a sample of o2 gas, which has a pressure of 740mmhg, at a temperature of 25c, in a volume of 250.l

Answer 1

from PV=nRT whereby n= mass per molar mass therefore PV=mRT over Mr making subject m it will be m =PV over RT substuting the above data 25+273 in kelvin 298k then m=740x 250/ 0.0821 x 298 multiply and divide the above eqn u will get the answer