The law of conservation of matter tells us that the total number of atoms does not change in a chemical reaction and thus mass is conserved. Select ALL of the reactions that obey the law of conservation of matter.
A) 4 NH3 + 5 02- 4 NO + 6 H20
B) 8 H25 + 8 C12 - Sg + 16 HCL
C) CH4 + 2 02 - CO 2 + H20
D) HCL + K2CO3 -- KCl + H2O + CO2
E) 2 Al(OH)3 + 3 H2S04 - AL2(SO4)3 + 6H20

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