Question

What would be the mass, in grams, of 1.505 x 1023 molecules of carbon disulfide?

Answer 1

19g

Step-by-step explanation:

Given:

Number of molecules = 1.505 x 10²³molecules

Formula of compound = CS₂

Unknown:

Mass of the compound

Solution:

A mole of every substance contains 6.02 x 10²³molecules. Using this we can find the number of moles from number of molecules given;

6.02 x 10²³molecules makes up 1 mole of a substance

1.505 x 10²³molecules will contain
`(1.505 x 10^(23) )/(6.02 x 10^(23) )` = 0.25mole of CS₂

Mass of CS₂ = number of moles x molar mass

Molar mass of CS₂ = 12 + 2(32) = 76g/mol

Mass of CS₂ = 0.25 x 76 = 19g