How many atoms are in 3.5 grams of copper

There are 3.3 × 10²² atoms in 3.5 grams of copper.

HOW TO CALCULATE NUMBER OF ATOMS:

The number of atoms of copper can be calculated by multiplying the number of moles of copper by Avogadro's number. However, 3.5grams of copper (Cu) was given in this question. The number of moles in copper is calculated as follows:no. of moles = 3.5g ÷ 63.5g/molno. of moles = 0.055molThe number of atoms of copper can be calculated as follows:no. of atoms = 0.055 × 6.02 × 10²³ no. of atoms = 0.33 × 10²³no. of atoms = 3.3 × 10²² atoms of Cu. Therefore, there are 3.3 × 10²² atoms in 3.5 grams of copper.

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