Question

Take the reaction NH3+O2=NO+H2O.In an experiment, 3.25g of NH3 are allowed to react with 3.50g of O2

Answer 1

Assuming the question is which is the limiting reagent

We find moles of NH3 as;

Moles of NH3= $\dfrac{3.25g}{17.031g/mol} = 0.191mol$

According to balanced equation;

4NH3 + 5O2 $\to$ 4NO + 6H2O

mole ratio of NH3:O2 = 4:5

moles of O2 required for complete reaction is

= $\dfrac{5}{4}x0.$ 191 = 0.2385mol

However, there are only $\dfrac{3.5g}{32g/mol}= 0.1094mol$

Thus oxygen is the limiting reagent