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# chem as ideal gas watch

1. 6. At 25 oC and 100 kPa a gas occupies a volume of 20 dm3. Calculate the new temperature of the gas if
a) the volume is decreased to 10 dm3 at constant pressure.
b) the pressure is decreased to 50 kPa at constant volum
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3. First, you need to convert to the right units, K, Pa and m3. Then rearrange pV=nRT to make moles the subject, so it would be n=pV/RT. Then (keeping the moles you just calculated) set temperature as the subject, and substitute in your new volume and pressure volumes.

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