Per path conversion for chemistry

Question

Which makes the most sense?

The correct per path for the conversion of grams of A to grams of B is:

grams A ® moles A ® moles B ® grams B

grams A ® moles B ® moles A ® grams B

moles A ® grams A ® moles B ® grams B

none of the above

Answer 1

The first answer is correct. You can never go directly from grams of A to grams of B because A and B have different formula weights or molar weights. So first you convert what you know -- grams of A -- into moles of A. Then, using the stoichiometry of the balanced equation, you convert moles of A into moles of B. Finally, you can convert from moles of B to grams of B, by using the formula/molar weight of B.

By "using the stoichiometry of the balanced equation", I mean that you have to look at the balanced equation and see what the relationship of A and B is. Is it one-to-one? Or some other relationship? For this general question, you don't need to be concerned about that, but in the future, it will matter, so it's just something to keep in mind.

Good luck in chemistry!

Answer 2

(grams A)(mol A / grams A)(mol B / mol A)(grams B / mol B)

the first would be right :)