How many atoms of gold (Au) are present in a sample of 2.5 mol Au?

1.5 × 10^24 atoms Au

1.5 × 10^23 atoms Au

4.2 × 10^24 atoms Au

4.2 × 10^23 atoms Au

Question

How many atoms of gold (Au) are present in a sample of 2.5 mol Au?

 1.5 × 10^24 atoms Au

 1.5 × 10^23 atoms Au

 4.2 × 10^24 atoms Au

 4.2 × 10^23 atoms Au

lena772 · Answer

I thought it was 2.5 x 10^23... but that's not an option :/

lena772 · Answer

@Kainui @sunshao1 @Slothish @adrynicoleb @halorazer

anonymous · Answer

Are you familiar with Avogadro's number?

lena772 · Answer

yes...

lena772 · Answer

6.0221413 x 10 ^23

lena772 · Answer

so that rules out A&C, but i thought it would be 2.5

anonymous · Answer

use avogardo's number since that is atom/mole

lena772 · Answer

not 1.5 or 4.2

anonymous · Answer

its closer to 4.2

lena772 · Answer

thanks ig.

anonymous · Answer

6.02 x 10^23 is the amount of molecules in a mole. if there are 2.5 moles then it would be (6.02 * 2.5) * 10^23
15.05 x 10^23.
Scientific notation goes from 0-10 in the first part, so we'd turn it into 1.505 x 10^24.

anonymous · Answer

So I do believe that means your answer is A.

lena772 · Answer

Thanks @halorazer

anonymous · Answer

That's what I'm here for. :3