If you answer and explain i will give 25 points!

a rectangular solid has dimensions of 1.8 cm by 3.5 cm by 10.0 cm and is made of brass. calculate the mass of the solid of brass has a density of 8.5 g/cm^3.

535.5g

Explanation:

1) find the volume of the object

         =L*W*H

         =1.8*3.5*10.0

         =63cm^3

2) the original formula is solving for the dencity which we have so...

         D=M/V

         M=D*V

         M=8.5(63)

         M=535.5g

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