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.


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"#