Mole concept, equivalent weight, empirical and molecular formula, limiting reagent.
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Q1 · Stoichiometry · MEDIUM
When 6.5 g of zinc reacts with dilute hydrochloric acid, the volume of hydrogen gas evolved at STP is (Atomic mass: Zn = 65)
Q2 · Stoichiometry · HARD
If 8.0 g of O₂ reacts with 3.0 g of H₂ to form water, the mass of water formed is (Atomic mass: H = 1, O = 16)