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

Answer 1

@welshfella @Kevin @Will.H @brainlesslonelygirl

Answer 2

Okay, but lets see what @welshfella says.

Answer 3

mol = 17.63/(12+2*16) = 0.40
total atom = 6.02*10^23 x 0.40 = 2.412 * 10^23

Answer 4

fraction of oxygen in CO2 = 2*atomic mass of oxygen / molecular mass of CO2
= 2*16 / 44 = 0.7273
0.7273 * 17.63 = 12.822 g O2
16 g O2 = 6.02 * 10^23 atoms
12.822 = (12.828 * 6.02 * 10^23) / 16 = 4.824 * 10^23

Answer 5

wait,
The question is about oxygen
What I calculate is molecule of CO2

1 molecule of CO2 has 2 atoms of O
so, it would be 2*2.412 * 10^23 = 4.824 * 10^23

Answer 6

nice. i agree

Answer 7

with whoever is right

Answer 8

hmm.. i get a different value
let me check again

Answer 9

Work it out, I have all the time in the world.
So don't worry :)

Answer 10

Yea its A

Answer 11

Okay