Question

how many moles are in 30.04 grams of water (h2o)?

Explanation:

Step1: Determine molar - mass of water

The chemical formula of water is $H_2O$. The molar mass of hydrogen ($H$) is approximately $1\ g/mol$, and the molar mass of oxygen ($O$) is approximately $16\ g/mol$. So, the molar mass of $H_2O$ is $2\times1 + 16=18\ g/mol$.

Step2: Calculate the number of moles

The formula to calculate the number of moles ($n$) is $n=\frac{m}{M}$, where $m$ is the mass and $M$ is the molar - mass. Given $m = 30.04\ g$ and $M = 18\ g/mol$. Then $n=\frac{30.04}{18}\approx1.67\ mol$.

Answer:

$1.67$ moles