Chem
posted by Peter .
A sample of gas of mass 2.929 g occupies a volume of 426 mL at 0degree Cel and 1.00 atm pressure. What is the molecular weight of the gas?
Thanks!

Chem 
DrBob222
Use PV = nRT
Calcualte n
n= #moles = grams/molar mass
You know n and g, calculate molar mass 
Chem 
Peter
How do I know what N is??

Chem 
DrBob222
n comes from the equation PV = nRT.
You have V, P, T, and you know R (0.08206) . n is the only unknown in that equation.
Don't forget to change T to Kelvin.
K = 273 + Celsius. 
Chem 
James
18
Respond to this Question
Similar Questions

Chemistry
A sample of gas collected over water at 42 C occupies a volume of one liter. The wet gas has a pressure of 0.986 atm. The gas is dried, and the dry gas occupies 1.04 L with a pressure of 1.00 atm at 90 C. Using this information, calculate … 
Chem 101
A 5.00 liter sample of gas measured at 27 degrees Celcius and 1.25 atm of pressure has a mass of 10.13 grams. What is the molecular weight of the gas in u? 
chem
A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ? 
chem
A 0.0097561 g quantity of an unknown gas occupies 0.2 L at 500 K and 2 atm. What is the Molecular Weight (MW) of the gas ? 
Chem II
A sample of gas at 38 degrees Celsius occupies a volume of 2.97 L and exerts a pressure of 3.14 atm. The gas is heated to 118 degrees Celsius and the volume decreased to 1.04 L. Determine the new pressure exerted by the gas. 
Chemistry
A sample of gas is confined to a cylinder housed with a movable piston. Initially, the gas occupies a volume of 2.7 L at 6.0 atm and 25°C. Calculate the volume of the gas sample if the pressure is reduced to 1.8 atm and the temperature … 
chem
A 9.80L container holds a mixture of two gases at 39 °C. The partial pressures of gas A and gas B, respectively, are 0.426 atm and 0.832 atm. If 0.250 mol a third gas is added with no change in volume or temperature, what will the … 
college chem
A sample of methane gas CH4, occupies a volume (L) of 58.2 L at a pressure of 7.25 atm. What volume will the gas occupy if the pressure is lowered to 2.03 atm 
chem
Show work 1. How many moles of oxygen will occupy a volume of 2.50 liters at 121.6 kPa and 331 K? 
Chemistry
A gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. A 5.25g sample of the gas occupies a volume of 1.00 L and exerts a pressure of 1.26 atm at 4.00°C. Which of these choices is its molecular formula?