A sealed 4.50 L steel cylinder initially at 25.0 °C contains nitrogen gas at an…
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A sealed 4.50 L steel cylinder initially at 25.0 °C contains nitrogen gas at an internal pressure of 8.25 atm. The cylinder is equipped with a precise mass balance so its contents can be weighed.
(a) Calculate the amount (in moles) of nitrogen present in the cylinder under the stated conditions. Show all unit conversions.
(b) Determine the mass of nitrogen (in grams) contained in the cylinder.
(c) The experimenter heats the cylinder to 155 °C while keeping the volume constant. Calculate the new internal pressure, assuming no gas has leaked.
(d) Briefly explain why it is important to confirm that the cylinder is vent-free before performing the heating step.