If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is
produced that contains 55.06% cobalt by mass. calculate the empirical
formula of the sulfide.

Co2S3.

Explanation:

% of sulphur =  44.94 %

Dividing by the atomic masses:

Co = 55.06 / 58.93 = 0.9343

S = 44.94 / 32.078 = 1.4010

Working out the ratio of Co to S:

1:1.5

= 2:3.

So the empirical formula is Co2S3.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)