2 Determine the number of moles of Cu atoms in 07g of copper

2. Determine the number of moles of Cu atoms in 0.7g of copper metal.

Solution

Answer:-

Part A ]

First we want the molar mass of Cu = 63.541 g/mol

Therefore, we can calculate the number of moles of Cu

0.7 g × ( 1mol / 63.541 g) = 0.01102 moles of Cu

Avogadro’s number is very important relationship to remember

1 mole = 6.022 × 10²³ atoms, molecule, protons etc.

To convert from mole to atom multiply the molar amount by Avogadro’s number

0.01102 mol Cu × (6.022 × 10²³ atom / 1 mol Cu) = 6.64×10²¹atoms of Cu