Question bank
Question Bank
Cambridge IGCSE Chemistry 0620 · 120 questions
Q115Stoichiometry
What mass of MgO forms from 24 g of Mg? (Mg 24, O 16)
(a)16 g
(b)40 g
(c)24 g
(d)48 g
Correct answer: (b) 40 g
Explanation: 2Mg + O₂ → 2MgO; 24 g gives 40 g.
Related lesson
3.2 Relative masses of atoms and moleculesStoichiometry Tags