Consider the following equation: Cu (s)+ 2 HBr (aq)$\rightarrow$ CuBr₂ (aq)+ H₂ (g) A 100 mL solution of 0.025-M HBr that completely reacts with copper metal will produce _____ moles of hydrogen gas.

Question

Quizplus · Accepted Answer

From the balanced equation, 2 moles of HBr react with 1 mole of Cu to produce 1 mole of H2.

We have 0.025 moles of HBr in 100 mL of solution, which can be converted to moles using:

0.025 moles/L x 0.1 L = 0.0025 moles of HBr

Since 2 moles of HBr are needed to produce 1 mole of H2, only half of the HBr (0.00125 moles) will react with Cu, producing 0.00125 moles of H2.

So the correct answer is:

Answer: B
 Only 0.0013 moles of hydrogen gas will be produced.

Consider the Following Equation: Cu (S)+ 2 HBr (Aq) →\rightarrow→ CuBr2 (Aq)+ H2 (G) a 100 ML Solution of 0

Consider the Following Equation: Cu (S)+ 2 HBr (Aq) $\rightarrow$ CuBr₂ (Aq)+ H₂ (G)
a 100 ML Solution of 0