The average mass of zinc in tablets - 0.16mg -- I agree
Titration question, [HCl] = 1.057 mol/L -- Got something like 0.9M
The identitfy of gas = H2(g) -- I agree
Highest energy released by: Hydrogen gas fuel -- I agree
Amount of energy released by 80L petrol = 2.6 x 106 kJ , or...