A mixture of 8.1 g CH4 and 8.1 g Kr is placed in a container and the total pressure is found to be 0.38 atm . 1) Find the partial pressure of CH4. 2) What is the oxidation number change for the oxygen atom in the following unbalanced reduction reaction : C8H8(g) + O2 (g) → CO2(g) + H2O(g)

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