Question

Mass of magnesium oxide produced when 168 g of magnesium carbonate is heated

Answer 1

Answer:

80 grams

Explanation:

1 mole of magnesium carbonate on heating decomposes to give 1 mole of magnesium oxide and i mole of carbon dioxide

in the question

no. of moles of magnesium carbonate = given mass / molar mass

= 168/84 = 2 moles

1 mole of magnesium carbonate gives 1 mole of magnesium oxide

therefore 2 moles of magnesium carbonate gives 2 moles of magnesium oxide

mass of 1 mole of magnesium oxide is 40 grams

therefore mass of 2 moles of magnesium oxide is 80 grams