Question

2.0 litres of a ideal nitrogen gas (N2) are at 0.0◦ C and 1.0 atm. The ideal gas constant is and the atomic mass of nitrogen is 14 g/mol. The number of moles, number of molecules of and the mass of N2 gas are ?

A sealed 26m3 tank is filled with 2000 moles of oxygen gas (O2) at an initial temperature of 270 K. The gas is heated to a 􏰓nal temperature of 460 K. The atomic mass of oxygen is 16.0 g/mol. The 􏰓nal pressure of the gas is closest to ?

Answer 1

1)

$\nu=\frac{pV}{RT}=0.09~mol,$

$N=\nu N_A=5.4\cdot 10^{22},$

$m=\nu\mu =2.5~g.$

2)

$p_2=\frac{\nu R T_2}{V}=2.9~atm.$