Question

What is 600 g of Si reacts with 500 g of N2 what is limiting and excess reactants?

Answer 1

Silicon is the limiting reactant and nitrogen the excess reactant.

Step-by-step explanation:

Hello,

In this case, the undergoing chemical reaction is:

`3Si+2N_2\rightarrow Si_3N_4`

Thus, to identify the limiting reactant, we shall compute the available moles of silicon and the moles of silicon that will be consumed by the 500 g of gaseous nitrogen, considering their 3:2 molar ratio in the chemical reaction, as shown below:

`n_(Si)^(available)=600gSi*(1molSi)/(28.1gSi) =21.4molSi\\n_(Si)^(consumed\ by\ N_2)=500gN_2*(1molN_2)/(14gN_2) *(3molSi)/(2molN_2) =53.6molSi`

Hence, we notice that 500 g of nitrogen will consume 53.6 moles of silicon but 21.4 moles are available only, for that reason, silicon is the limiting reactant and nitrogen the excess reactant.

Best regards.