Question

3

A student has a 5.00 gram sample of calcium chloride (CaCl2) solid. How many moles of calcium chloride are

contained in this sample?

Answer 1

Answer: 0.0450 moles of
`CaCl_2`

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

To calculate the moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}`

`\text{Number of moles of} CaCl_2=(5.00g)/(110.98g/mol)=0.0450moles`

Thus there are 0.0450 moles of
`CaCl_2`