a sample of calcium oxide (cao) has a mass of 2.80 g. the molar mass of cao is 56.08 g/mol. 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.

Step2: Substitute given values

We are given $m = 2.80\ g$ and $M=56.08\ g/mol$. So $n=\frac{2.80\ g}{56.08\ g/mol}$.

Step3: Calculate the result

$n=\frac{2.80}{56.08}\approx0.0499\ mol$.

Answer:

0.0499 moles