Question

calculate the number of atoms in 168.0 HgS
- can someone please show me how to do this with the steps, I got a answer, but im not sure if its correct

Answer 1

you need to find the molar mass of the compound, look at the periodic table and add up Hg + S.

then you divide the grams by the molar mass of the compound

\[moles =\frac{ mass (g) }{molar mass(g/mol) }\]

Answer 2

i got the final answer as 8.7x10^23 is tht correct?
in the end do yu have to multiply the answer with the number of atoms yu have?
because thats what i did

Answer 3

sorry i forgot to mention that, you do multiply the number of moles by avogadros number.. 6.023x10^23

Answer 4

but your number seems high because 168 g is not even one mole

Answer 5

so what is the answer then?
can yu calculate it and tell me pls

Answer 6

moles = [168/(200.59+32.066)]

atoms = (moles) (6.023x10^23)

=434918506292552094078811.636063544460491025376518734

Answer 7

i got tht number first but then i multiplied it by 2 since there are 2 atoms in it

Answer 8

HgS <-- 2 atoms?

Answer 9

isnt that how yu do it

Answer 10

haha frig, you're so right, idk why I'm not thinking

Answer 11

LOOL

Answer 12

yay i am right, so if this question was asking for the number of molecules, would you still have to multiply the number of atoms or no?

Answer 13

if it asked for the number of molecules, then you don't multiply by 2

Answer 14

oh arii thanks !

Answer 15

no probs !