A buffer solution is prepared by dissolving 0.100 moles of methylamine (CH3NH2) and 0.06 moles of methylammonium chloride (CH3NH3Cl) in 0.250
L of solution. Calculate the pH of this solution after 0.200 moles of HCl has
been added. Kb = 4.38 x 10-4 for methylamine.

- decrease the number of plants and animals living in the water.

answer///carbon;

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