23. what are the correct formulas and coefficients for the products of the following double replacement reaction? al(oh)3 + h3po4 → *

a. alpo4 + h2o

b. alpo4 + 3 h2o

c. h3al + (oh)3po4

d. 3alpo4 + h3(oh)3

24. what type of reaction is 2s(s) + 3o2 (g) → 2so3(g)? *

a. combination reaction

b. decomposition reaction

c. single replacement reaction

d. double replacement reaction

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