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Stoichiometry and Stoichiometric Calculations

4 grams of Hydrogen reacts with 40 grams of Oxygen to form water. Excess reagent in the reaction is


Alternatively: 4 gm H2 = 4 equivalents which reacts with 4 equivalents of O2, 32 gms. 

Mass of excess O2 = 40  - 32  = 8gm.

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