Question

2CuO+O2=2CuO CuO-2г O2-?

Answer 1

Будет занимать одну треть от двух грамм, где то ~0,67 г

Answer 2

It appears you're trying to balance a chemical equation involving the reaction between copper(II) oxide (CuO) and oxygen (O2). The balanced chemical equation for this reaction is:

2CuO + O2 → 2CuO

This equation indicates that two molecules of copper(II) oxide react with one molecule of oxygen gas to produce two molecules of copper(II) oxide. The equation is already balanced because there are the same number of atoms of each element on both sides of the equation.