How many atoms are present in....

ChungusUp

How many atoms are present in 16.0 g of methane, CH4?
A 6.02 x 1023
B 5
C 1.20 x 1023
D 3.01 x 1024

Reply 1

EverythingIsHere

D... I would show you my work but my post would probably get f-ed up soo PM me??

Reply 2

username3028808

A.
First, work out the moles. 16/16 is 1 mol.
Now, multiply the number of moles by avogadros constant (6.022x10^23).

EDIT: Misread as number of molecules, in that case answer is D as you'd multiply by 5 for the number of atoms in a single molecule of CH4.

(edited 4 years ago)

Reply 3

the bear

so a mole of carbon has mass 12g

a mole of hydrogen has mass 1g

16g of methane is made up of 12g of carbon & 4g of hydrogen....

Reply 4

AdamCor

https://study.com/academy/answer/how-many-hydrogen-atoms-are-in-1-0g-of-ch4.html

Reply 5

ChungusUp

Original post by naem071

A.
First, work out the moles. 16/16 is 1 mol.
Now, multiply the number of moles by avogadros constant (6.022x10^23).

So in order to find out the no. of atoms in an thing, I'd need to find the no. of moles of it and times by Avg's constant?

Reply 6

username3028808

Original post by ChungusUp

So in order to find out the no. of atoms in an thing, I'd need to find the no. of moles of it and times by Avg's constant?

Yep.

Reply 7

EverythingIsHere

Original post by ChungusUp

So in order to find out the no. of atoms in an thing, I'd need to find the no. of moles of it and times by Avg's constant?

Agreed

Reply 8

ChungusUp

Original post by EverythingIsHere

Agreed

Fools, it was D. ATOMS not MOLECULES

Reply 9

username3028808

Original post by ChungusUp

Fools, it was D. ATOMS not MOLECULES

Haha, somehow I missed that despite you mentioning 'atoms' about 3 times. In that case, all you have to do once you have your number of molecules (from multiplying number of moles with Avogadro's constant) is multiply by 5 (because there's 1 carbon atom and 4 hydrogen atoms in a molecule of CH4).