if 100.0 grams of copper (cu) reacts completely with 25.0 grams of oxygen, how much oxygen will completely react with 140 grams of copper?

35 grams of oxygen

Explanation:

The law of constant proportion or composition states that the elements that combine to form a chemical compound combine in fixed whole number ratios.

Therefore, the ratio of the that make up any pure sample of a given compound are present in the same mass ratio

The given parameters are;

The mass of oxygen that reacts completely with 100 grams of copper, (cu) = 25.0 grams

Therefore;

1 gram of copper completely reacts with 25/100 = 1/4 grams of oxygen

140 grams of copper will completely react with 140 × 1/4 = 35 grams of oxygen

∴ 35 grams of oxygen will completely react with 140grams of copper.

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)