## happykiddo 2 years ago How do I figure out the number of atoms in element, when I know the molar mass is 3.30 ???

1. sara12345

whats the element ?

2. happykiddo

Krypton

3. sara12345

so you have 3.3 moles of Krypton, and you want to find how many atoms are there, is tha t right ?

4. happykiddo

Yes

5. sara12345

replace mole wid Avogadro number

6. happykiddo

Ok

7. sara12345

1 mole = 6.022 × 10^23 items

8. sara12345

just like, 1 dozen = 12 items

9. sara12345

3.3 moles of Kr = 3.3 x 6.022 × 1023 atoms

10. happykiddo

Thanks, a bunch. :)

11. happykiddo

We're did you get1023

12. happykiddo

Please answer me , I need some clarification .

13. sara12345

3.3 moles of Kr = $$3.3 \times 6.022 × 10^{23}$$ atoms

14. sara12345

its like that

15. sara12345

$$1\ mole = 6.022 \times 10^{23}$$ atoms

16. happykiddo

Oh oops ok thank you very much. :)

17. sara12345

wlc :)

18. happykiddo

So the answer is 19x10 to 23 atom According to significant figures

19. sara12345

you wanto show it in scientific notation ?

20. happykiddo

So the answer is 19 x 10 to 23 power According to significant figures

21. sara12345

$$3.3 \times 6.022 × 10^{23}$$ $$19.8726 \times 6.022 × 10^{23}$$ $$1.98726 \times 6.022 × 10^{24}$$

22. sara12345

thats scientific notation, we must change that 19.xxxx to 1.9xxxx

23. happykiddo

Oh yeah forget .....well really once again thank you.

24. sara12345

yw