Question

I'LL FAN AND MEDAL PLEASE HELP

One mole of a chemical element contains approximately 6.02 × 10^23 atoms. How many atoms are present in 4.6 × 10^4 moles of oxygen? Represent the answer in scientific notation. Round so the first factor goes to the hundredths place.

A:2.77 × 10^27 atoms

B:2.77 × 10^28 atoms

C:27.7 × 10^27 atoms

D:27.7 × 10^28 atoms

Answer 1

sorry i'm too lazy to help rn

Answer 2

multiply the two numbers together (6.02 × 10^23 atoms times 4.6 × 10^4 moles)

Answer 3

what is 10^23 times 10^4?

Answer 4

wym @Vocaloid

Answer 5

... what is 10^23 * 10^4?

Answer 6

* means multiply

Answer 7

what number do you get when you multiply 10^23 and 10^4?

Answer 8

1.e+27

Answer 9

good

now we multiply 6.02 * 4.6 to get 27.7

now we have

27.7 * 10^27

now, we convert that to scientific notation. any ideas how?

Answer 10

no

Answer 11

we start by dividing 27.7 by 10 to get 2.77
then we multiply the 10^27 by 10 to get 10^28

so your final answer is 2.77 * 10^28

Answer 12

so the answers b @Vocaloid

Answer 13

yes

Answer 14

thank you so so so so much

Answer 15

@ashtonfoshee @Vocaloid
All is fine for the math part, well done.
Now for the chemistry part, @ashtonfoshee , the question asks for the number of atoms (and not molecules). As you know, an O2 molecule has two atoms. That makes none of the answers valid. Can you check if there's typo, or the answers are wrong?

Answer 16

yeah, i just noticed that

it's a badly written question but it just sounds like they wanted to test scientific notation and multiplication

Answer 17

@vocaloid
Yes, I agree with you totally. Unfortunately they are churning out questions of less than respectable quality. This kind of misleading information can imprint a wrong concept in students' minds for a long time.