how many moles of water (h₂o) are present in a beaker containing 45.9 g h₂o? give your answer to the correct…

how many moles of water (h₂o) are present in a beaker containing 45.9 g h₂o? give your answer to the correct number of significant figures. (molar mass of water = 18.02 g/mol)\n45.9 g h₂o = mol h₂o

how many moles of water (h₂o) are present in a beaker containing 45.9 g h₂o? give your answer to the correct number of significant figures. (molar mass of water = 18.02 g/mol)\n45.9 g h₂o = mol h₂o

Answer

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.

Step2: Substitute given values

We have $m = 45.9\ g$ and $M=18.02\ g/mol$. So $n=\frac{45.9\ g}{18.02\ g/mol}$.

Step3: Calculate the number of moles

$n=\frac{45.9}{18.02}\approx2.55\ mol$ (rounded to three significant figures as 45.9 has three significant figures).

Answer:

$2.55$