of a mixture of and contains 90% Copper by mass. What is the number of moles of (scaled by )? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

$\text{Mass } Cu_2O = 10\% \text{ of } 10\text{g} = 1 \text{ g}$. <br>$\text{MW } Cu_2O = 143 \text{ g/mol}$. <br>$\text{moles} = 1 / 143 \approx 0.00699 \approx 7 \times 10^{-3} \text{ mol}$. Value is 7. [4, 27]