Question

What mass of copper has the same number of atoms as 26.98 g of aluminum? Show your work for full credit!

A. Convert the mass of aluminum to moles of aluminum. Molar mass of aluminum (Al) = 26.98 g/mol

B. Convert the moles of aluminum to moles of copper. We are comparing the same amount (in moles) of aluminum and copper.

C. Convert the moles of copper to mass of copper. Molar mass of copper (Cu) = 63.55 g/mol

Answer 1

63.55 g Cu

Step-by-step explanation:

Mass of Aluminium = 26.98 g

Molar mass of Aluminium = 26.98 g/mol

We can therefore, get the number of moles of Al

Moles = mass/molar mass

= 26.98 g ÷ 26.98 g/mol

= 1 mole Al

Since we are comparing equal number of moles of Cu and Al

Moles of copper = 1 mole

We can now convert moles of copper to mass

Mass = Moles × Molar mass

Molar mass of Cu = 63.55 g/mol

= 1 mole × 63.55 g/mol

= 63.55 g

Therefore, the mass of copper that would have the same number of atoms as 26.98 g Al is 63.55 g of Cu