**Passage 4:** What is the total mass of gas evolved from the mixture ()? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

$\text{moles } NO_2 (\text{from Cu}) = 2 \times (3.175/63.5) = 0.1$. <br>$\text{moles } NO_2 (\text{from Ag}) = 0.063$. <br>$\text{Total moles} = 0.163$. <br>$\text{Total mass} = 0.163 \times 46 \approx 7.5 \text{ g}$.