Question

The reaction 2c+o2 gives 2 co2 is carried out by taking 24g of carbon and 96 of o2 find out which reactant is left in excess

Answer 1

2C + 2O2 = 2 CO2

24 g of carbon will consume 64 g of oxygen.

But we have 96 g of oxygen.

Therefore excess oxygen = 96-64 = 32 g.

Answer 2

Answer: Oxygen

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

$\text{moles of carbon}=\frac{24g}{12g/mol}=2 moles$

$\text{moles of oxygen}=\frac{96g}{32g/mol}=3moles$

$2C+O_2\rightarrow 2CO_2$

According to the stochiometry in the given balanced equation:

2 moles of carbon react with 1 mole of oxygen and thus (3-1)=2 moles of oxygen are left.

Thus carbon is a limiting reagent as it limits the formation of products and oxygen is a excess reagent as it is present in excess.