Question

How many grams of magnesium oxide can be produced when 97.2g Mg react with 88.5g O2?

Answer 1

we gots to write the equation
2Mg + O2 -------> 2MgO

moles of Mg = 97.2 / (24.3 x 2)
= 2

therefore there are 2 moles of MgO
Mr of MgO = 40.3

mass MgO = 40.3 x 2 = 80.6