For the balanced reaction
4NH3 + 3O2 → 2N2 + 6H2O
(Atomic weights: H = 1.0 g/mol: N = 14.0 g/mol: O = 16.0 g/mol), the mass of oxygen needed to react with 75.0 g of ammonia is
(a) 188 g
(b) 106 g
(c) 141 g
(d) 53.0 g
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