Original Khojo Papers practice question — not from a past board paper.
10 g
No citable source has been recorded for this record. Treat it as practice material, not as fact.
2Mg + O2 → 2MgO. 48 g of magnesium gives 80 g of the oxide, so 6 g gives 6 × 80 ÷ 48 = 10 g.
From the same topic and chapter, at a similar level.
What volume of oxygen at S.T.P. is needed for the complete combustion of 10 dm3 of methane, and what volume of carbon dioxide is formed? All volumes are measured at the same conditions.
Mole Concept and Stoichiometry
Calculate the mass of calcium oxide obtained by heating 100 g of pure calcium carbonate. (Ca = 40, C = 12, O = 16)
Mole Concept and Stoichiometry
A compound contains 40% carbon, 6.7% hydrogen and 53.3% oxygen by mass. Find its empirical formula. (C = 12, H = 1, O = 16)
Mole Concept and Stoichiometry
Calculate the mass of calcium oxide obtained when 50 g of calcium carbonate is completely decomposed by heating. (Ca = 40, C = 12, O = 16)
Mole Concept and Stoichiometry
Calculate the volume occupied by 0.5 mole of any gas at S.T.P.
Mole Concept and Stoichiometry
Calculate the number of molecules in 8 g of oxygen gas. (O = 16, Avogadro number = 6.022 × 1023)
Mole Concept and Stoichiometry
