How many grams of oxygen gas are required to produce 7.53 kJ of heat when hydrogen gas burns at constant press?

How many grams of oxygen gas are required to produce 7.53 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water?
2 H2(g) + O2(g) ? 2 H2O(g) ?H = ?484 kJ
Liquid water has a heat of vaporization of 44.0 kJ per mole at 25°C.

What volume of nitrogen monoxide is required to react with 44.4 liters of hydrogen gas according to the follow?

What volume of nitrogen monoxide is required to react with 44.4 liters of hydrogen gas according to the following reaction? (All gases are at the same temperature and pressure.)

What is the minimum amount of hydrogen gas required to completely hydrogenate 13000 grams of 2-butene?

What is the minimum amount of hydrogen gas required to completely hydrogenate 13000 grams of 2-butene?

I’m guessing the 2-butene is CH3-CH=CH-CH3, but I don’t know what else to do to help me solve this.
Could someone help me out with additional steps, please?

Thank you in advance!

How many grams each of hydrogen gas and oxygen gas are required to produce 4.50 mol of water?

im new to chemistry and need help with this problem. please help

How many grams each of hydrogen gas and oxygen gas are required to produce 4.50 mol of water?

What Can Be Added To Hydrogen Gas To Increase The Minimum Required Ignition Energy To Ignite It?

Here’s an interesting chemistry question…
When using hydrogen in an internal combustion engine, it has a tendency to pre-ignite due to a hot intake valve, and although there are things that can be done to the engine itself to fix that, such as ceramic coating the valves or adding sodium filled valves, I was wondering what could be added to the hydrogen gas itself to counteract the pre-ignition tendency? Possibly another gas mixed in? Would an alcohol spray have any effect if mixed in with it like it does with gasoline?