Theoretically, how much zinc [at. wt. = 65.41] in grams would be needed to produce 500.00 grams of copper metal from any soluble copper (ii) salt?

514.65 g of Zn

Zinc metal reacts with copper ions in a salt of copper to form copper metal and zinc (ii) salt.

The equation for the reaction is;

Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)

we are required to calculate the mass of Zinc needed

The mass of copper metal produced is 500.0 grams

We can get the number of moles of copper,

Molar mass of copper = 63.55 g/mol

But; Number of moles = Mass ÷ Molar mass

Therefore;

Moles of copper = 500.0 g ÷ 63.55 g/mol

                           = 7.868 moles

From the reaction 1 mole of Zinc metal reacts with a salt of copper (ii) to produce 1 mole of copper.

Therefore, the ratio of Zn : Cu is 1 : 1

Hence;

Moles of zinc will be 7.868 moles

Moles of Zn = 7.868 moles

Molar mass of Zn = 65.41 g/mol

But; Mass = number of moles × molar mass

Thus;

Mass of Zn = 7.868 moles × 65.41 g/mol

                  = 514.65 g

Therefore, the mass of Zn metal needed is 514.65 g

a) the particles of the chair are strongly held together.