A Pb ( s ) | Pb 2 + ( aq ) | | Au 3 + ( aq ) | Au ( s ) Pb(s) | Pb2+(aq) || Au3+(aq) | Au(s) galvanic cell has a standard cell potential of 1.628 1.628 V. Calculate the Gibbs free energy change at 25 25 °C when 2.45 2.45 g of gold is deposited. Assume that the concentrations in the cell remain at the standard state values of 1 1 M through the entire deposition process.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical

Which of the following has expanded our knowledge of the universe beyond our solar system the most? a. manned space travel b. the hubble space telescope c. the pioneer and voyager missions d. the international space station