Question

Magnesium reacts with oxygen to give magnesium oxide. If 3.00 g of Mg and 5.00 g O2 are allowed to react, what weight of MgO is formed?

Answer 1

First create the equation
Mg + O2 -> 2MgO

Next balance it:
2Mg + O2 -> 2MgO

Now convert the masses to moles and use stoichiometry and limiting reagents to figure out the mass of the product

Answer 2

Use an ICE table