OCR A-Level Chemistry- Amounts of Substance- The Ideal Gas Equation

Any help on this question please??

At 25.00 degrees C and 100.0kPa, a gas occupies a volume of 20.00dm^3.
Calculate the new temperature of the gas if:
a) The volume is decreased to 10.00dm^3 at constant pressure. (we are told to use the data from the question to calculate moles as that won't change at different temperatures)
b) The pressure is decreased to 50.00kPa at constant volume.

Is it a case of just alter the volume and pressure and keep the remaining ones the same??

(edited 5 months ago)

Reply 1

cr7090121

11

Original post by s_mxh23

Any help on this question please??

At 25.00 degrees C and 100.0kPa, a gas occupies a volume of 20.00dm^3.
Calculate the new temperature of the gas if:
a) The volume is decreased to 10.00dm^3 at constant pressure. (we are told to use the data from the question to calculate moles as that won't change at different temperatures)
b) The pressure is decreased to 50.00kPa at constant volume.

Is it a case of just alter the volume and pressure and keep the remaining ones the same??

yes and yes you need the moles and don't forget its not in degrees but in kelvin so 298 also its a gas at rtp you don't even need to use pv=nrt if you want you can use 24 dm3 mole^-1 rtp of a gas

Reply 2

s_mxh23

OP

1

Original post by cr7090121

yes and yes you need the moles and don't forget its not in degrees but in kelvin so 298 also its a gas at rtp you don't even need to use pv=nrt if you want you can use 24 dm3 mole^-1 rtp of a gas