how many molecules are in 850.2 grams of AuCl

Answer 1

This is a dimensional analysis problem, which means you will start with the given data point and use a conversion faction to go from grams to molecules.

Problem map:

Grams --> (molar mass) --> moles --> (Avogadro's constant) --> molecules

Grams --> (molar mass) --> moles:

850.2g AuCl x (mol / 232.423g) = 3.658 mol AuCl

moles --> (Avogadro's constant) --> molecules:

3.658 mol AuCl x (6.02x10²³ molecules / mol) = 2.202 molecules AuCl

Answer: 2.202 molecules are in 850.2 grams of AuCl.

*Let me know if this make sense. If not I would be happy to explain in more detail. Also, the answer has 4 significant figures as this is what is required based on the question.