I don’t know how to do this because I was sick when this was thought. If someone could please explain how to do or set up the first problem.

Question

I don’t know how to do this because I was sick when this was thought. If someone could please explain how to do or set up the first problem.
A. Measure out 0.130 moles of salt (NaCl) into a blue, dry cup. You need to convert to mass in grams. Show work:
B. Put 4.03x10^23 molecules of water into a clear cup. You need to convert to mass in grams. Show work:
C. Obtain a small sample of metal from your teacher. Determine how many atoms it contains. Show work: the metal sample weighs 142g

bobpursley · Answer

a. mass=moles*formulaMassNaCl b. mass=moles*molmass=numbermolecules*molmass/avagNumber c. you have to know what kind of metal. atoms=mass*avagnumber/molmassmetal