Question

How do you convert mass of a compound to moles?​

Answer 1

Answer:

Mass (g) / Molar mass

Explanation:

Moles of a compound is  mass (g) / molar mass.

Let's see this example.

How many moles are 18000 mg of water.

Mass of compound is 18000 mg but we have to convert to g.

18000 mg . 1 g/ 1000 mg = 18 g

Molar mass of water is 2 g/mol from H + 16 g/mol from oxygen = 18 g/mol

Then, 18 grams of water are 18 g / 18g/mol = 1 mol

Answer 2

Answer:

The answer to your question is below

Explanation:

To convert the mass of a compound to moles,

1.- You must get the atomic mass or molecular mass of the substance.

2.- Consider that the molecular mass or atomic mass of a substance is equal to 1 mol.

3.- Use proportions to find the answer.

Example

Convert 12 g of NaCl to moles

Molecular mass of NaCl = 23 + 35.5 = 58.5 g

                    58.5 g ---------------------  1 mol

                    12 g     --------------------- x

                      x = (12 x 1) / 58.5

                      x = 0.21 moles