# college chemistry

how many L @STP if oxygen are needed to produce 45.0 grams of nitric oxide according to the following balanced chemical equation? 4NH3 + 5O2=4NO + 6H2O

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1. mols NO = grams/molar mas = ?
Using the coefficients in the balanced equation, convert mols nO to mols O2. That ratio is 4 mols NO/5 mols O2.

Then remember that one mole of a gas at STP occupies 22.4 L.

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2. CALCULATE THE OXIDATION NUMBER FOR THE FOLLOWING CR IN K2CR2O4 AND MN IN MNO4

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3. CALCULATE CR IN K2CR2O4 AND MN IN MNO4

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