If a certain amount of hydrogen combustion product is gaseous water and the product is liquid water, will the heat generated be the same

If a certain amount of hydrogen combustion product is gaseous water and the product is liquid water, will the heat generated be the same

Different
When the product is gaseous water, it gives off heat Q1
The product is the heat Q2 produced by liquid water
The heat Q3 released during the liquefaction of gaseous water
According to the conservation of energy: Q1 + Q3 = Q2
Because Q3 is greater than zero, Q2 is greater than Q1
When the product is liquid water, the heat generated is greater than that when the product is gaseous water

Hydrogen reacts with oxygen to produce gaseous water and liquid water with the same mole number. Which gives out more heat?

The energy of gaseous water is high, so when liquid water is generated, it needs to continue to absorb energy
The same amount of hydrogen reacts with oxygen to produce liquid water, which gives off more heat. When gaseous water becomes liquid water, it also gives off heat during liquefaction

1 kg liquid oxygen = how much gaseous oxygen?

1kg liquid oxygen = 1kg gaseous oxygen = 0.70m3 gaseous oxygen