please in short solution

QI. The pressure gauge on a tank of CO, used to fill soda-water bottles reads 51.0 psi. At the same time the barometer reads 28.0 in. Hg. What is the absolute pressure in the tank in psia? Q2. Oil of density 0.91 g/cm flows in a pipe. A manometer filled with mercury (density = 13.6 g/cm) is attached to the pipe. If the difference in height of the two legs of the manometer is 0.78 in. head of mercury, what is the corresponding pressure difference between points A and B in mm Hg? At which point, (A or B) is the pressure higher? Why? Calculate the pressure difference in normal pressure units (N/m). SHOW ALL YOUR CALCULATIONS IN SI SYSTEM U 1078 inches Q3. You are given 100 mole of a fuel gas of the following composition, on a mole basis, 20% methane (CH4), 5% ethane (CH), and the remainder CO2. The atomic weight for each element is as follows: C = 12,0 = 16 and H= 1 For this mixture calculate: a. The mass composition b. Average Molecular Weight by the three equations