Question

ANSWER PLZ................

Answer 1

Solution is in the pic :)

Answer 2

Explanation:

The data given is as follows.

      Weight of material = 40 g

      Weight of CuO = 5 g

Molecular weight of CuO = 76.55

Atomic weight of Cu = 63.55

Calculate the percentage of copper in the sample as follows.

$\frac{Atomic weight of Cu}{Molecular weight of CuO} \times \frac{weight of CuO(in the sample)}{weight of material} \times 100$

            $\frac{63.55}{76.55} \times \frac{5 g}{40 g} \times 100$

            = $\frac{317.75}{3062}$

            = $0.1037 \times 100$

            = 10.37 %

Thus, we can conclude that the percentage of copper in the sample is 10.37 %.