Final answer:
When 0.5g of copper reacts with oxygen, it produces 0.625g of copper oxide.
Step-by-step explanation:
The question provides a ratio of the masses of copper and copper oxide formed in the reaction. To find the mass of copper oxide produced when 0.5g of copper reacts with oxygen, we can set up a proportion using the given ratio from the question: 63.5g of copper produces 79.5g of copper oxide. Using this proportion, we can find the mass of copper oxide:
0.5g of copper x (79.5g of copper oxide/63.5g of copper) = 0.625g of copper oxide
Therefore, when 0.5g of copper reacts with oxygen, it produces 0.625g of copper oxide.