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Mass of oxygen needed to react completely with 64.3 g ammonia?

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4NH3 + 5O2 ------> 4NO + 6H2O

Convert g NH3 to mols. mols = grams/molar mass = ?

Using the coefficients in the balanced equation, convert mols NH3 to mols O2. You see 4 mols NH3 will need 5 mols O2.

Convert mols O2 to grams O2. grams = mols x molar mass = ?

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