A zinc-copper cell is constructed: Zn | Zn2+(1M) | Cu. What occurs to the mass of the copper electrode as the reaction proceeds? (Zinc is above copper in the activity series of metals.) It increases
It decreases
Cannot be determined
It remains the same

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

c. 4.54 x 10–12 j happens to be correct

the answer is symmetrical : )