- Calculate the percent composition for calcium nitrate and then tell how many grams of each
lement are in an 85 gram sample.

i believe it is c.) 1575 j.

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.

just did the assignment and the answer was #1 +2 n

i believe the answer is true.