Question

How many moles of NO are formed from 2.5 moles of NO2 if there is plenty of water present

Answer 1

Moles of NO formed : 0.833

Further explanation

Given

2.5 moles of NO2

Required

moles of NO formed

Solution

Reaction

3 NO₂(g) + H₂O(l) = 2 HNO₃(aq) + NO(g)

The reaction coefficient in a chemical equation shows the mole ratio of the compounds in the reactants and products

From the equation, mol ratio of NO₂ and NO = 3 : 1, so moles of NO :

$\tt moles~NO=\dfrac{1}{3}\times 2.5\\\\moles~NO=0.833$