one mole of water is equivalent to 18 grams of water. a glass of water has a mass of 108 g. how many moles…

Explanation:

Step1: Recall mole - mass formula

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. The molar mass of water ($H_2O$) is $M = 18\ g/mol$ (2 hydrogen atoms with molar mass approximately $1\ g/mol$ each and 1 oxygen atom with molar mass approximately $16\ g/mol$: $2\times1 + 16=18\ g/mol$).

Step2: Substitute values into formula

We are given that $m = 108\ g$ and $M = 18\ g/mol$. Substituting these values into the formula $n=\frac{m}{M}$, we get $n=\frac{108\ g}{18\ g/mol}$.

Step3: Calculate the number of moles

$n = 6\ mol$.

Answer:

$6\ mol$