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!

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?