Conceptual Connection 4.4 Nitrogen dioxide reacts with water to from nitric acid

Question

Conceptual Connection 4.4 Nitrogen dioxide reacts with water to from nitric acid and nitrogen monoxide according to the equation: 3NO_2(g) + H_2O(iota)rightarrow2HNO_3(iota) + no(g) Part A Suppose that 5.0 mol no_2 and 1.2 mol h_2o combine and react completely. Which reactant is excess? Express your answer as a chemical formula. Part B How many moles of the reactant in excess are presort are present after the reaction has competed? Express your answer using two significant figures. Part A Suppose that 5.0 mol no_2 and 1.2 mol h_2o combine and react completely. Which reactant is excess? Express your answer as a chemical formula. Part B How many moles of the reactant in excess are presort are present after the reaction has competed? Express your answer using two significant figures.

Explanation / Answer

Given reaction

3 NO2 + H2O ---------> 2 HNO3 + NO

From this balanced equation , we can say that

For every 1 mole of H2O , 3 moles of NO2 is required.

Hence,

For every 1.2 moles of H2O , 1.2 x 3 = 3.6 moles of NO2 is required.

But we have 5 moles of NO2.

Therefore, NO2 is in excess.

Excess no of moles of NO2 = 5 - 3.6 = 1.4 moles

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