Question

Calculate the number of moles of chlorine molecules in 142g of chlorine gas.

Answer 1

1•Molar mass of atoms. Number of moles of atoms = mass in grams.
2•Molar mass of atoms. Number of moles of chlorine = 142g of chlorine gas.
3•Molar mass of chlorine 71gmol-1. = 2 moles of chlorine molecules.

Answer 2

Answer:

4 Mol

Explanation:

n - number of moles

m - mass (g)

M - molar mass (g. mol¯¹)

n:?

m: 142g

M: 35.5 mol¯¹

n= m/M

= 142/35.5

= 4 mol