Question

A given mass of gas occupies 850cm3 at 320K and 0.92x10^5 Nm^-2 pressure. Calculate the new volume of the gas at S.T.P.

The formula is :
V1xP1/T1 = V2xP2/T2

the answer is 66o cm3

But i cant find the answer ,,,, please help me with this ! :'(

Answer 1

@iambatman can u help me with this ?

Answer 2

The formula you have comes from PV=nRT. In this case, the moles of gas isn't changing, and R, as a constant, isn't changing, so we can just say that PV/T equals the same constant, nR, before and after the changes.

We just need to plug in the numbers we have and solve for the unknown. Temperature is already in Kelvin, so we're good for that, and volume and pressure are both in units we can use as long as they're the same on both sides.

All you need to know are the temperature and pressure values at STP (which you should know). At STP, temperature is 273 K, and pressure is 100 000 Pa. A pascal (Pa) is the same as a N/m^2, so 100 000 Pa = 100 000 N/m^2.

Plug in the values you know and then solve for the final volume!

Answer 3

U are correct it;s just the matter of substituting the values.
At STP the temperature is 273K and pressure is 1* 10^5Nm^-2

Answer 4

@matt101 Thankyou So much !
I got my answer :) Thankyou so much :D