Question

If a plant needs to make 12.6 g of glucose(c6h1206), how many grams of water are required?

Answer 1

Answer: 7.6 g of water are required to make 12.6 g of glucose

Explanation:

Moles is calculated by using the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {moles of glucose}}=\frac{12.6g}{180g/mol}=0.07moles$

The balanced chemical equation is:

$6CO_2+6H_2O\rightarrow C_6H_{12}O_6+6O_2$

According to stoichiometry:

1 mole of glucose is produced by = 6 moles of water

Thus 0.07 moles of glucose is produced by =$\frac{6}{1}\times 0.07=0.42$ moles of water

Mass of water required =$moles\times {\text {Molar mass}}=0.42mol\times 18g/mol=7.6g$

Thus 7.6 g of water are required to make 12.6 g of glucose