Consider the following intermediate chemical equations pa(s)+ 8c12(9) -- 4pc13 (9) lh7--2,439vj 4pc\,(9) ►p()+1001,(9) ah, -3,438 kj what is the enthalpy of the overall chemical reaction pci,(g) → pc1,(g)+cl,(9) o-999 kj o-250 kj o 250 kj 999 kj

what is the question?

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