The composition of a natural gas is provided below at the reservoir temperature of 249F and pressure of 1000 psia:

Constituent	Mole %	Molecular Weight
N2	4.80	28
CO2	0.90	44
He	0.03	4
C1	80.70	16
C2	8.70	30
C3	2.90	44
C4	1.70	58
C5	0.13	72
C6	0.06	86
C7+	0.03	100

Calculate the apparent molecular weight (M_a) of the gas. (5 marks)

Calculate the specific gravity of the gas mixture. If required, apply corrections for impurities. (5 marks)

Calculate the pseudo-critical properties (P_c and T_c) of the C₇₊ fraction. (2 marks)

Calculate the pseudo-critical temperature, T_c and the pseudo-critical pressure, P_c using Kays mixing rules. (5 marks)

If needed, calculate the corrected pseudo-critical temperature, T_c and the pseudo-critical pressure, P_c for the values calculated in Question 4 above. (5 marks)

Calculate the pseudo-reduced temperature, T_r and pseudo-reduced pressure, P_r for the values calculated in Question 5 above. (5 marks)

Estimate the following gas properties for this gas mixture at the reservoir temperature of 249F and pressure of 1000 psia.

Compressibility factor, z (2 marks)

Gas density, g (2 marks)

Gas viscosity, g (5 marks)