A 0.850 g sample of He(g) is sealed in a 2.00 L steel cylinder at 298 K
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A 0.850 g sample of He(g) is sealed in a 2.00 L steel cylinder at 298 K. The cylinder is then placed in a laboratory oven maintained at 355 K. Assume the gas behaves ideally and that neither gas escapes nor volume changes during heating.
(a) Calculate the number of moles of He(g) present in the cylinder.
(b) Determine the initial pressure of the gas while it is at 298 K.
(c) Calculate the final pressure of the gas after it has reached thermal equilibrium at 355 K.
(d) Briefly comment on how the rigidity of the cylinder influences the calculation you performed in part (c).