How many oxygen atoms are in 17.63 grams of CO2?

4.823 x 1023 atoms

2.412 x 1023 atoms

4.730 x 1024 atoms

9.648 x 1023 atoms

A?

Question

How many oxygen atoms are in 17.63 grams of CO2?
		
4.823 x 1023 atoms
		
2.412 x 1023 atoms
		
4.730 x 1024 atoms
		
9.648 x 1023 atoms

A?

rhondasommer · Answer

@sweetburger

jfraser · Answer

have you got the work to show how you got there?

rhondasommer · Answer

The molar mass of CO2, which is close to 44g/mole, and then divide the 17.63 grams: 
17.63g / 44 g/mole = ca. 0.4 moles. 

I then multiply with Avogadro's number (6.022), and get 2.412 x 10^23. To find the number of oxygen atoms, I have to double this, because the number of carbon atoms to oxygen atoms is 1:2. 

Right?

jfraser · Answer

that's how it's done, GJ

rhondasommer · Answer

Phew.

rhondasommer · Answer

@sweetburger do you agree

sweetburger · Answer

yep definitely I arrived to my answer the same way

jfraser · Answer

you always want to follow the units whenever you do conversions like this