When 24g of magnesium metal is heated in air, 40g of magnesium oxide is produced. What mass of magnesium would be needed in order to produce 10g of magnesium oxide?

Answer: 6.1 g

Explanation:

between Mg and MgO theres a 1; 1 MOLE RATIO

here's the balanced equation

2Mg + O2 = => 2MgO

24g of magnesium is approximately 1 mole of magnesium so it produces 40 g of mgo which is also 1 mole of mgo thus 10/40 = 0.25 moles of MgO so 0.25 moles of magnesium would be needed which is approximately 6.1 g