Chemistry help. Please if you know the answers help me. I cannot seem to get the answers right. 10 points?

[jarl]

6. Write down expressions for the combined gas law, Boyles Law and Charles Law. Under what circumstance would you use each Law?

15. Estimate the number of moles of gas (and mass of gas assuming that it is all N2) inside your family car (or a friends if you don't have one). If the amount of gas was compressed at constant temperature to fit inside a coke can what ould the pressure inside the coke can be?

[gillivray5]

6.
Boyle's Law: P1 V1 = P2 V2 if T remains unchanged
Charles's Law: V1/T1 = V2/T2 if P remains unchanged
Combined gas law takes many forms.
One form is pV=nRT, another form is
P1 V1 / T1 = P2 V2 / T2.
You choose which one to use in such a way that you
have only 1 unknown in your equation.

#15. One mole of gas occupies 22.4 L at 1 atmosphere and 0 C.
I don't know the actual interior volume of a car, but let's say it's
3 m^3, which would be 3000 L.
That would be about 134 moles of gas.
If it were all N2 (molecular weight 28 g/mole), that would be 3.75 kg.
A coke can contains 12 fl oz, which is about 0.35 L
If the gas were compressed from 1 atm, 3000 L down to 0.35 L,
the pressure would be about 10000 atmospheres.

Note that there is no single right answer for #15, it depends on the car.