Question

When $127g$ of copper reacts with $32g$ of oxygen gas to form copper (II) oxide, no copper or oxygen is left over. How much copper (II) oxide is produced?

• A. $32g$
• B. $95g$
• C. $127g$
• D. $159g$

Answer 1

The correct option is D $159g$

$2Cu+O_2\to 2CuO$

Total mass on reactants side $=127g+32g=159g$ that should be equal to the mass of products that is $159$g

The correct option is D.