CHEM MULTIPLE CHOICE .... please also explain the reason?

Per 1 H2 there's 243 kj of heat produced. Since 1215 is 5 times bigger than 243, 5 H2 is needed. And the molar mass of hydrogen is 1 so 10 grams of hydrogen must be burn to get 1215 kj of heat.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.