This is an encrypted text. Tlie ssec jumepd ovre teh lazy dog. When decoding the above passage, we will see that it is a type of message encrypted by the method of shifting letters according to a certain rule.

Now, try to find the rule and decode the above passage to find the original message.

A solution of Cu²⁺ has a volume of 2.50 L, and 48,246 C are required to reduce the Cu²⁺ to Cu⁺. What was the original molar concentration of copper? What is the molar concentration of Cu⁺ after the passage of 12,061 C?

9. (7 pts) Consider the electrode reaction

2H2O(l) + 2e-?H2(g) + 2OH-(aq)
How many days will it take to produce 15.00 liters of H2(g), collected over water at 24°C and 1.05 atm, by the passage of a current of 1.00 Amperes , if water is reduced by the above reaction? At 24°C the vapor pressure of water is 22.4 torr.

A mixture of oxygen and hydrogen is analyzed by passing it overhot copper oxide and through a drying tube. Hydrogen reduces theCuO to metallic Cu. Oxygen then reoxidizes the copper back to CuO.We know that 100 cm^3 of the mixture measured at 25C and 750 mmyields 84.5 cm^3 of dry oxygen measured at at 25C and 750mm afterpassage over CuO and the drying agent. What is the originalcomposition of the mixture? (Hint: First write balancedchemical equation for the reactions.)