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?

1 Answer
Feb 17, 2016

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"_2contains 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"