2

3

6

4

•There are 3 molecules in the formula 3H2SO4

Explanation: H2SO4 is one molecule and the number 3 shows there are 3 molecules

•There are 4 Al atoms in the formula 2Al2(CO3)3

Explanation: It shows there are 2 molecules of Al2(CO3)3 and each of those molecules has 2 Al atoms, so in total there are 2x2 Al atoms= 4 Al atoms

•There are 9 Total atoms in the formula 3MgBr2

Explanation: There are 3 molecules of MgBr2 and each molecule has 1 Mg atom and 2 Br atoms = 3 atoms for each molecule. The 3 molecules have 3x3 atoms = 9 atoms

Explanation: H2SO4 is one molecule and the number 3 shows there are 3 molecules

•There are 4 Al atoms in the formula 2Al2(CO3)3

Explanation: It shows there are 2 molecules of Al2(CO3)3 and each of those molecules has 2 Al atoms, so in total there are 2x2 Al atoms= 4 Al atoms

•There are 9 Total atoms in the formula 3MgBr2

Explanation: There are 3 molecules of MgBr2 and each molecule has 1 Mg atom and 2 Br atoms = 3 atoms for each molecule. The 3 molecules have 3x3 atoms = 9 atoms

a. Silver; chlorine

b. One atom of Ag; one atom of Cl

c. Two atoms total

Explanation:

6H, 3S, and 12O

6 + 3 + 12 = 21

I believe 21 is your answer. I may be wrong, but I hope this helps anyways!

6 + 3 + 12 = 21

I believe 21 is your answer. I may be wrong, but I hope this helps anyways!

4 because there is 2 at the front and 2 already part of the compound so you need to multiply it.

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