<u>Answer:</u> The limiting reagent in the given equation is lithium metal.
<u>Explanation:</u>
Limiting reagent is defined as the reagent which is present in less amount and also it limits the formation of products.
Excess reagent is defined as the reagent which is present in large amount.
To calculate the number of moles, we use the equation:
....(1)
- <u>For Lithium metal:</u>
Given mass of lithium metal = 1.50 g
Molar mass of lithium metal = 6.94 g/mol
Putting values in equation 1, we get:
Given mass of nitrogen gas = 1.50 g
Molar mass of nitrogen gas = 28.01 g/mol
Putting values in equation 1, we get:
- For the given chemical reaction:
By stoichiometry of the reaction:
6 moles of lithium reacts with 1 mole of nitrogen gas
So, 0.216 moles of lithium will react with = of nitrogen gas.
As, the given amount of nitrogen gas is more than the required amount. Thus, it is considered as an excess reagent.
So, lithium metal is considered as a limiting reagent because it limits the formation of products.