**Passage 4:** of a mixture of and is reacted with to produce gas. of is evolved at STP. reacts as: — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

Question

**Passage 4:** $10 \text{ g}$ of a mixture of $Cu$ and $Ag$ is reacted with $HNO_3$ to produce $NO_2$ gas. $2.24 \text{ L}$ of $NO_2$ is evolved at STP. $Cu$ reacts as: $Cu + 4HNO_3 \rightarrow Cu(NO_3)_2 + 2NO_2 + 2H_2O$. $Ag$ reacts as: $Ag + 2HNO_3 \rightarrow AgNO_3 + NO_2 + H_2O$. If the mixture contains $x \text{ g of Cu}$, find the moles of $NO_2$ from $Cu$.