Asample of 1.6 g of methane (ch4) is completely burnt in 20.00 g of oxygen. the products are carbon dioxide and water. which is the excess reactant? which is the limiting reactant? how much of the excess reactant remains unreacted?

Answer :

The excess reactant is,

The limiting reactant is,

The mass of excess reactant remains unreacted is, 13.6 grams

Solution : Given,

Mass of = 1.6 g

Mass of = 20.00 g

Molar mass of = 16 g/mole

Molar mass of = 32 g/mole

First we have to calculate the moles of and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 1 mole of react with 2 mole of

So, 0.1 moles of react with moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and is a limiting reagent and it limits the formation of product.

Remaining moles of excess reactant = 0.625 - 0.2 = 0.425 mol

Now we have to calculate the mass of

Thus, the mass of excess reactant remains unreacted is, 13.6 grams

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