Please I need help with this:
Methane gas can be burned according to the following reactions:

CH4 + 2 O2 =CO2 + 2 H2O (1 )

2 CH4 + 3 O2 = 2 CO + 4 H2O (2)

If a reactor is fed with 100 mol/h of methane.

a) What would be the theoretical or stoichiometric O2 flow rate, if the combustion in the reactor is complete (only reaction 1 occurs)?

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Determine the damped natural frequencies and the steady state response of a decoupled damped forced two degrees of freedom system. 10ä1 + 2q1 20q1 10 cos t; 10q2 +4q2 + 40q2 10 cos t