I need help with five chemistry questions

Question

I need help with 5 chemistry questions and would need work to be shown. 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
1. Your metal element is trading at $0.000656/g on the stock market. What is the value of your sample of metal?
2. Restate the mathematical relationship between number of moles and masses, or number of molecules and mass, as a complete sentence below:

Answer 1

Use same method as shown in my answer to your previous question for parts A and B.  I'll show you the abbreviated version.

A.  0.130 moles NaCl x 58.4 g/mole = 7.59 g NaCl

B.  4.03x10²³ molecules x 1 mole/6.02x10²³ molecules x 18 g/mole = 12.0 g H₂O

C.  In order to determine the number of atoms in 142 g of metal, one needs to know the identity of the metal. Why?  Because 142 g of Na does not have the same number of molecules as 142 g of potassium, etc. etc.  You must convert the 142 g to moles and then using Avogadro's number, convert moles to molecules.

1.  Values of metal sample = $0.000656/g x 142 g = $0.093 or about 9 cents.

2.  The number of moles is related to the mass by the molar mass or atomic mass of the species and the number of molecules is related to moles by Avogadro's number, i.e. there are 6.02x10²³ molecules in 1 mole of a compound.