For the reaction CH₄ + 2O₂ → CO₂ + 2H₂O, how many grams of CO₂ form from 32 g of CH₄ (all other reactants are in excess)? (Relative atomic masses: H = 1, C = 12, N = 14, O = 16, Na = 23, Mg = 24, Al = 27, S = 32, Cl = 35.5, K = 39, Ca = 40, Fe = 56, Zn = 65.)
Answer and explanation
Correct answer: D. 88 g
- Step 1: Moles of CH₄ = 32/16 = 2 mol.
- Step 2: The mole ratio CH₄ : CO₂ is 1 : 1, so 2 mol of CO₂ forms.
- Step 3: Mass = 2 x 44 = 88 g.
Answer
88 g.
Why not the others: 32 g: the mass of product was assumed equal to the mass of reactant. 2 g: the moles of product were found but not converted to grams. 176 g: the mole ratio was inverted.
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