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# Ideal Gases help watch

1. I really can’t do these questions if anyone can help with even just one please do xox

1) what volume of carbon dioxide gas, measured at 527’C and 100000Pa is formed when 1000g of propane is burned in a good supply of oxygen?
C3H8 + 5O2 -> 3CO2 + 4H2O

2) Calculate the relative molecular mass of a gas which has a density of 2.615gdm^-3 at 25’C and 101000Pa

3) a certain mass of an ideal gas is in a sealed vessel of volume 3.25dm^3. At 25’C it exerts a pressure of 101000Pa. What pressure will it exert at 100’C?

4) An ideal gas occupies a volume of 2.75dm^3 at 17’C and 8.7 x 10^4Pa. At what temperature will it occupy 3.95dm^3 at 1.01 x 10^5Pa?

Thank you to anyone who can help
2. (Original post by Gmartina)
I really can’t do these questions if anyone can help with even just one please do xox

1) what volume of carbon dioxide gas, measured at 527’C and 100000Pa is formed when 1000g of propane is burned in a good supply of oxygen?
C3H8 + 5O2 -> 3CO2 + 4H2O

2) Calculate the relative molecular mass of a gas which has a density of 2.615gdm^-3 at 25’C and 101000Pa

3) a certain mass of an ideal gas is in a sealed vessel of volume 3.25dm^3. At 25’C it exerts a pressure of 101000Pa. What pressure will it exert at 100’C?

4) An ideal gas occupies a volume of 2.75dm^3 at 17’C and 8.7 x 10^4Pa. At what temperature will it occupy 3.95dm^3 at 1.01 x 10^5Pa?

Thank you to anyone who can help

For the first one, calculate the number of moles of Propane by dividing the weight (1000g) by the molecular mass,
You know that propane to CO2 is in a 1:3 ratio so number of miles of CO2 is 3 times the number for propane.
Then use PV=nRT and rearrange to find V (nRT/P)

For 4 find the number of moles (PV/rT=n) then use n in a second equation to find T(PV/nR)

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