Question

Consider some unknown compound containing only copper and oxygen. In order to determine the empirical formula, a sample of the compound is decomposed into the elements copper and oxygen. The original sample had a mass of 0.6349g prior to decomposition. After the reaction, 0.5066g of pure copper solid was recovered. How many moles of copper were initially in the sample?

Answer 1

The number of mole of copper in the sample is 0.008 mole.

Mole is simply defined as the unit of amount in a substance.

The mole of a substance can be obtained by dividing the mass of the subtance by its molar mass i.e

Mole = mass / molar mass

With the above information, we can obtain the mole of copper in the compound as follow:

Mass of copper = 0.5066 g

Molar mass of copper = 63.5 g/mol

Mole of copper =?

Mole = mass / molar mass

Mole of copper = 0.5066 / 63.5

Mole of copper = 0.008 mole

Therefore, 0.008 mole of copper was initially present in the compound.

Learn more: brainly.com/question/14295066