Chem calorimetry question!!!?

Posted on 2015-11-17 07:18:00 in Chemistry by LINDA

Anyone able to help with these questions please?? I have a test and trying to study!

1 ) At 413 K, the pressure of a diatomic gas in a 3.0 L vessel is 635 kPa. The gas has a mass of 88.7 g. Identify the gas.

2) Propane is a common fuel. Use the following thermochemical equation to calculate the grams of propane you would need to produce 325 kJ of heat.
(The molar mass of C3H8 is 44.11 g/mole)
C3H8 (g) + 5 O2 (g) ? 3 CO2 (g) + 4 H2O (g) ?H = - 2043 kJ

3) A gas has a density of 1.15 g/L at STP. Determine its molar mass.

Thanks in advance!!

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