Question

Find the number of particles in 5.5 g of CaCl₂ (calcium chloride)

The molar mass of CaCl₂ is 111.0 g/mol

Answer 1

`\huge{ \boxed{3.01 * {10}^(22) \: particles}}`

Step-by-step explanation:

To find the number of particles of
`\bold{CaCl_2}` we use the formula;

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question the number of moles was not given, however the mass and the molar mass of the compound was given. So we the number of moles can be found by using the mass and molar mass by using the formula;

`n = (m)/(M)`

where:

m is the mass in grams

M is the molar mass in g/mol

n is the number of moles

`\therefore \: n = (5.5)/(111) \\ = 0.05 \: moles`

`\therefore \: N = 0.05 * 6.02 * {10}^(23) \\ = 3.01 * {10}^(22)`