Question

1. How many moles of water molecules are there in 39 grams of Chlorine?

2. How many molecules are there in 39 grams of Gold?​

Answer 1

1. There is no moles of water in 39g of chlorine.

2. 1.19x10²³ molecules of Au.

Step-by-step explanation:

First, we need to remember that molar mass of a compound represents the mass of 1 mole (6.022x10²³ molecules) of molecules.

Molar mass of Chlorine, Cl₂ is 70.9g/mol

Molar mass of gold, Au, is 197g/mol

1. Moles of 39g of Cl₂ are:

39g Cl₂ * (1mol / 70.9g) = 0.55 moles moles of chlorine

But there is no moles of water in 39g of chlorine.

2. First, moles of Au are:

39g Au * (1mol / 197g) = 0.198 moles Au.

Molecules are:

0.198 moles Au * (6.022x10²³ molecules / 1 mol) =

1.19x10²³ molecules of Au