Question

PLEASE HELP ---- S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O

In the above equation how many moles of water can be made when 85 moles of HNO3 are consumed?

Answer 1

2moles of H2O are made when 6moles of HNO3 are consumed

75 mole of HNO3 produces =
`(2)/(6)`× 75 ⇒ 25 moles of water

Limiting Reagent Method

The limiting reagent is the reactant that is completely used up in a reaction and thus determines when the reaction stops.

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O

6 mole of HNO3 produces
`(2)/(6)` = 2 moles of H₂O

1 mole of HNO3 produces = mole of H₂O

∴ 75 mole of HNO3 produces =
`(2)/(6)` × 75 ⇒ 25 moles of water