Question

How many moles of oxygen gas can be produced during electrolytic decomposition of 180 g of water?

• A. $2.5$ moles
• B. 5 moles
• C. 10 moles
• D. 7 moles

Answer 1

Answer: (B)

5 moles

Answer 2

(2) : $\underset{2 \times 18 = 36g}{2H_{2}0 \rightarrow}2H_{2} + O_{2}$

36 g of water produces 1 mole of $O_{2}$gas.

180. g of water will produe 180/36 = 5 moles of $O_{2}$gas.