As an organism grows, where do its new cells come from?

It's new cell comes from its old cell

The answer to your question is e. 3.99 g

Explanation:

Data

Cu₂S = 5g

theoretical yield = ?

Chemical reaction

                             Cu₂S + O₂ ⇒ 2Cu + SO₂

Process

1.- Calculate the molecular mass of Cu₂S and Cu

Cu₂S = (2 x 64) + 32 = 160 g

Cu = 2 x 64 = 128 g

2.- Calculate the theoretical production of Cu

                            160 g of Cu₂S   128 g of Cu

                                5 g of Cu₂S     x

                                x = (5 x 128) / 160

                                x = 640 / 160

                               x = 4 g of Cu