Question

Which of the following does not have the same number of atoms as the other three choices?

a) 3 moles Na2SO4
b) 6 moles water
c) 9 moles NaCl
d) 5 moles CH4

Answer 1

The option that does not have the same number of atoms as the other three choices is 6 moles of water.

Step-by-step explanation:

To determine which choice does not have the same number of atoms as the other three choices, we need to calculate the number of atoms in each option.

a) 3 moles of Na2SO4: Na2SO4 contains 2 sodium (Na) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms. Therefore, there are 6 sodium atoms, 3 sulfur atoms, and 12 oxygen atoms in 3 moles of Na2SO4.

b) 6 moles of water (H2O): Each water molecule contains 2 hydrogen (H) atoms and 1 oxygen (O) atom. Therefore, 6 moles of water contain 12 hydrogen atoms and 6 oxygen atoms.

c) 9 moles of NaCl: Each NaCl molecule contains 1 sodium (Na) atom and 1 chlorine (Cl) atom. Therefore, 9 moles of NaCl contain 9 sodium atoms and 9 chlorine atoms.

d) 5 moles of CH4: Each CH4 molecule contains 1 carbon (C) atom and 4 hydrogen (H) atoms. Therefore, 5 moles of CH4 contain 5 carbon atoms and 20 hydrogen atoms.

Based on the calculations, we can see that option b) 6 moles of water does not have the same number of atoms as the other three choices.