For each of the expressions below, can you find the total number of atoms represented?

Question

A. 2MgCl2 how many- Mg: (insert answer) Cl: (insert answer) Total atoms: (insert answer)
B. NaBr how many- Na: (insert answer) Br: (insert answer) Total atoms: (insert answer)
C. 4H2O how many- H: (insert answer) O: (insert answer) Total atoms: (insert answer)

Answer 1

To determine the total number of atoms represented in each expression, we'll analyze the composition of each compound.

A. 2MgCl2

• Mg: There are 2 magnesium (Mg) atoms (from the coefficient 2).
• Cl: There are 2 chlorine (Cl) atoms per formula unit of MgCl2. Since there are 2 formula units, the total chlorine atoms are \(2 \times 2 = 4\).
• Total atoms: \(2 \text{ (Mg)} + 4 \text{ (Cl)} = 6\).

So the answer is:

• Mg: 2
• Cl: 4
• Total atoms: 6

B. NaBr

• Na: There is 1 sodium (Na) atom.
• Br: There is 1 bromine (Br) atom.
• Total atoms: \(1 \text{ (Na)} + 1 \text{ (Br)} = 2\).

So the answer is:

• Na: 1
• Br: 1
• Total atoms: 2

C. 4H2O

• H: There are 2 hydrogen (H) atoms per formula unit of H2O. Since there are 4 formula units, the total hydrogen atoms are \(4 \times 2 = 8\).
• O: There is 1 oxygen (O) atom per formula unit of H2O. Since there are 4 formula units, the total oxygen atoms are \(4 \times 1 = 4\).
• Total atoms: \(8 \text{ (H)} + 4 \text{ (O)} = 12\).

So the answer is:

• H: 8
• O: 4
• Total atoms: 12

In summary: A. Mg: 2, Cl: 4, Total atoms: 6
B. Na: 1, Br: 1, Total atoms: 2
C. H: 8, O: 4, Total atoms: 12