Question

What amount of atoms, in mol, is present in 128g of sulfur dioxide? Why?

Between the optional answer I have :

A. 1.2 X `10^24`
B. 3.6 x `10^24`
C. 2
D. 6

I know that the answer is 6, I just don't know/ understand why?

Answer 1

I know how to show that the answer is D.

Explanation:

I know that the answer is 6,

The reason is that if we divide 128 g by the molar mass of sulfur dioxide we get `128/"64,066"` = 2 moles of molecules.

Each molecule of `"SO"_2` contains 3 atoms, so each mole of `"SO"_2`contains 3 mol of atoms.

`2 color(red)(cancel(color(black)("mol of molecules"))) × "3 mol of atoms"/(1 color(red)(cancel(color(black)("mol of molecules")))) = "6 mol of atoms"`