Question

Description :
1.a . Write two differences between mass and weight ?(2M)
b . Write two differences between Precise and Accuracy?(2M)
c. state significant figures ?(1M)
2.a. Calculate the percentage of composition of C , H and oxygen in Ethyl alcohol ?(3M)
b. Define Molality ?(1M)
c. write the S.I unit of molarity ?(1M)
3.a. If 20 % of NaOH is dissolved in water. find mole fraction of NaOH and water ?(Na=23g, O=16g and H=1g) (3M)
b. 4 g of NaOH is dissolved in 250 ml of solution .find its molarity ?(2M)

Answer 1

Explanation:

a)The difference between mass and weight is that mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass. Mass is the measure of the amount of matter in a body. Mass is denoted using m or M. ... Weight is mass multiplied by the acceleration of gravity (g)

b)