Question

How many moles are in 4.35 grams of water?

• A. $1.807\times {10}^{-24}$
• B. $3.476\times {10}^{-2}$
• C. $1.717\times {10}^{-2}$
• D. $1.204\times {10}^{24}$
• E. $2.417\times {10}^{-1}$

Answer 1

The correct option is E $2.417\times {10}^{-1}$

The number of moles is the ratio of mass to molecular weight.
The mass of water is 4.35 grams.
The molecular weight of water is 18 g/mol.
The number of moles of water
$=\frac{\text{4.35 g}}{18g}=2.417\times {10}^{-1}$ moles