Turnbill269
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If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?

Sagot :

lulu1991
The reaction formula of this is NaCl + AgNO3 = NaNO3 + AgCl. The mole number of NaCl is 4/58.5=0.068 mol. The mole number of AgNO3 is 10/170=0.059 mol. So the NaCl is excess.

Answer : The excess reagent is, [tex]NaCl[/tex]

Explanation :

First we have to calculate the moles of [tex]NaCl[/tex] and [tex]AgNO_3[/tex].

[tex]\text{Moles of }NaCl=\frac{\text{Mass of }NaCl}{\text{Molar mass of }NaCl}=\frac{4g}{58.4g/mole}=0.068moles[/tex]

[tex]\text{Moles of }AgNO_3=\frac{\text{Mass of }AgNO_3}{\text{Molar mass of }AgNO_3}=\frac{10g}{169.9g/mole}=0.058moles[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

[tex]NaCl+AgNO_3\rightarrow AgCl+NaNO_3[/tex]

From the balanced reaction we conclude that

As, 1 mole of [tex]NaCl[/tex] react with 1 mole of [tex]AgNO_3[/tex]

So, 0.068 moles of [tex]NaCl[/tex] react with 0.068 moles of [tex]AgNO_3[/tex]

From this we conclude that, the moles of [tex]AgNO_3[/tex] are less than the NaCl. So, [tex]AgNO_3[/tex] is a limiting reagent because it limits the formation of products and [tex]NaCl[/tex] is an excess reagent.

Hence, the excess reagent is, [tex]NaCl[/tex]

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