Mass and Weight

Bring out the differecnes between the mass and the weight of a body.

The gravitational force on Jupiter is approximately 2.3 times the gravitational force on Earth. If an object has a mass of 80 kg and a weight of 784 N on Earth, what would the object's mass and weight on Jupiter be?

Carbon and oxygen react with each other in the ratio 3 : 8 by mass. What weight of carbon should be used to react completely with 40 g of oxygen?

Relation belween number of average molecular mass (overline(M)_(n)) and weight of average molecular mass (overline(M)_(w)) of synthetid polymers is