Which of the following stoichiometric relationships or principles firmly apply to the quantitative e — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Carbon and Hydrogen are completely oxidized to $CO_2$ and $H_2O$ respectively. The formula for $\%C$ is correct, based on the molar masses of C (12) and $CO_2$ (44). Option D is incorrect because $CuO$ provides the oxygen for combustion; hence, it acts as an oxidizing agent, not a reducing agent.