How many atoms are in 5.00 moles of water (H2O)?

$$8.33~x~10^{−24}~atoms$$

$$6.02~x~10^{23}~atoms$$

$$3.00~x~10^{24}~atoms$$

$$9.03~x~10^{24}~atoms$$

Question

How many atoms are in 5.00 moles of water (H2O)?
		
$$8.33~x~10^{−24}~atoms$$
		
$$6.02~x~10^{23}~atoms$$
		
$$3.00~x~10^{24}~atoms$$
		
$$9.03~x~10^{24}~atoms$$

rhondasommer · Answer

@sweetburger

sweetburger · Answer

This is a conversion from moles to particles or "molecules". In 1 mole there is 6.022x10^23 particles or "molecules" So if you have 5 moles then you have 5* 6.022x10^23. The number of particles in one mole is known as Avogadro's number.

rhondasommer · Answer

but 30.11 isn't an answer :/

rhondasommer · Answer

or isnt in one of the answers

sweetburger · Answer

3.011 x 10^24

rhondasommer · Answer

but...that isnt in one of the answers either...how did you get that?

sweetburger · Answer

My bad just ignore the .011 and let it be 3.00 x 10^24 atoms

sweetburger · Answer

that was rounding error on my part.

sweetburger · Answer

You get that answer by multiplying 5 times 6.022x10^23

rhondasommer · Answer

but how did you get that? but 5*6.022 is 30.11

rhondasommer · Answer

and how did 10^23 all of the sudden become 10^24

sweetburger · Answer

Because scientific notation shoots that 0 behind the decimal and increases the 10^23 to a 10^24.

sweetburger · Answer

so 5 x 6.022 is 30

rhondasommer · Answer

OH! I get it now. okay that makes sense

sweetburger · Answer

but that new 0 goes behind the decimal increasing 10^23 to 10^24

rhondasommer · Answer

yeah ok. I see what you did now. that makes sense