In preparing a saturated solution of KNO3 at 40°C a scientist initially adds 30.g of solute in 100.g of water. How much additional KNO3 must be added to reach the saturation point. A)
64g

B)
75g

C)
18g

D)
34g

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

i believe the answer is 5,000