How many atoms of sulfur are there in 2 g of sulfur

Hi Feitan,

Welcome to the forum!

You got a mention in my wrap last night.  

Melody 

I write an "End of Day Wrap" most nights (sydney Time) I encourage everyone to read them because it is the main way that I communicate with everyone on the forum.  

http://web2.0calc.com/questions/all-questions-answered-to-this-point#r146

First, we need to convert this to moles. Sulfur's molar mass is 32.06. For this, I'll also assume that the mass is an exact number (see here)

2 g S / 32.06 g/mol = 0.0623830318 mol S

Now we just multiply with the Avogadro's Number.

0.0623830318 mol S * 6.022*10^23 mol^-1 = 3.756706176*10^22 atoms S

Since we used an exact number, the answer can use any number of significant figures.

Hey Feitan,

Nice answer!

I haven't seen you before on the forum are you new here?

I was just wondering about the part of the signifant numbers...

Isn't it true that since 2g has only 1 significant number the final answer should also have only 1 significant number?

Reinout 

Hey Reinout!

Yeah, I joined yesterday actually. Thanks!

Ah, I didn't think about that...That's true. So the answer would actually be 4*10^22 atoms S, I believe?

Thank you very much for correcting me! c: