NO reacts with H2O and O2 to make nitrous acid according to the reaction. 4 NO +

Question

NO reacts with H2O and O2 to make nitrous acid according to the reaction.
4 NO + O2 + 2 H2O ? 4 HNO2
If 56g of NO are reacted with 36g of H2O and excess O2 what mass of HNO2 will be produced?
Select one: a. 47.0g HNO2 b. 87.7g HNO2 c. 43.9g HNO2 d. 94.0g HNO2 NO reacts with H2O and O2 to make nitrous acid according to the reaction.
4 NO + O2 + 2 H2O ? 4 HNO2
If 56g of NO are reacted with 36g of H2O and excess O2 what mass of HNO2 will be produced?
Select one: a. 47.0g HNO2 b. 87.7g HNO2 c. 43.9g HNO2 d. 94.0g HNO2 NO reacts with H2O and O2 to make nitrous acid according to the reaction.
4 NO + O2 + 2 H2O ? 4 HNO2
If 56g of NO are reacted with 36g of H2O and excess O2 what mass of HNO2 will be produced?
Select one: a. 47.0g HNO2 b. 87.7g HNO2 c. 43.9g HNO2 d. 94.0g HNO2

Explanation / Answer

moles of NO taken = 56 g / ( 30 g/mol) = 1.8667 mol

moles of H2O taken = 36 g/ (18 g/mol) = 2 mol

consider the given reaction

4 NO + O2 + 2 H2O ---> 4 HNO2

moles of NO required = 2 mol H2O x ( 4 mol NO / 2 mol H2O) = 4 mol NO

but only 1.8667 mol NO are present

so

NO is the limiting reagent and H2O is in excess

so while calculating the amount of HNO2 , NO should be considered

now

moles of HNO2 produced = 1.8667 mol NO x ( 4 mol HNO2 / 4 mol NO)

moles of HNO2 produced = 1.8667 mol HNO2

mass of HNO2 produced = 1.8667 mol x 47 g/mol

mass of HNO2 produced = 87.733 g

so

the answer is b) 87.7 g HNO2

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