provide with enough heat, magnesium and oxygen can undergo a synthesis reaction. how much magnesium is neede if 3.5kg of product is desired?

Answer 1

there is also part a) and b) to this qoustion that i wrote. i forgot to write it sorry.

a) what amount of oxygen is neede to react completely with 2.4g of magnesium?

b) if i have 2g of magnesium and 5g of oxygen, which reactant will run out first???

Answer 2

All of these are stoichiometry problems. See that example post.
http://www.jiskha.com/science/chemistry/stoichiometry.html