## anonymous 3 years ago calculate the number of atoms in (a) 52 moles of He (b) 52 g of He (c) 52 u of He

1. anonymous

@waterineyes :D

2. anonymous

This site is not properly working for me.. So I did not get your messages...

3. anonymous

oh .. :/

4. anonymous

so .. you know to do this ?

5. anonymous

Let us try..

6. anonymous

okay :)

7. anonymous

1 mole of He = $$6.023 \times 10^{23}$$ atoms of He

8. anonymous

okay !

9. anonymous

So find for 52..

10. anonymous

okay .. i'll try :)

11. anonymous

Mention my name here I want to check I am getting notifications or not..

12. anonymous

@waterineyes

13. anonymous

No I am not getting any..

14. anonymous

I am not able to see my Smart Score too and my username is written in red also no green..

15. anonymous

|dw:1345194842168:dw|

16. anonymous

blame the site :P

17. anonymous

i wrote 52 its not seen

18. anonymous

is it right to carry on ?

19. anonymous

Yes you have to just multiply 52 with that Avagadro number.. What do you get on solving ??

20. anonymous

Yes you are right have faith on yourself and carry on I am here to check your mistakes..

21. anonymous

Oh wow playing hide and seek with me @ashna .. Where have you gone ???

22. anonymous

One thing I want to say that your previous profile pic I like that than your this one..

23. anonymous

b> part hint is : 52 g of He: 1 mole of He = 6.023 * 10^{23} atoms 4 g = 6.023 * 10^{23} atoms Solve it for 52 grams..

24. anonymous

In third part I am not getting what is u there.. 52 u ??

25. anonymous

@waterineyes lol you joke too

26. anonymous

some problem with the net .. i said yu that b4 !

27. anonymous

hey you turned green :P

28. anonymous

what is u ?

29. anonymous

okay i changed my profile picture .. atleast now come back :P

30. anonymous

|dw:1345202157654:dw||dw:1345202309858:dw|

31. anonymous

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32. anonymous

is u the atomic unit symbol or something ? am not exactly sure about it but in some part of my brain it is registerd like that !

33. anonymous

water water everywhere nor any drop to drink .. n wen yu are not replayin .. i feel like sayn water water onlyn everytym but does not reply to my question :P

34. anonymous

a) $$313.04 \times 10^{23}$$ atoms b) $$78.299 \times 10^{23}$$ atoms.

35. anonymous

You have calculated them right @ashna Well Done..

36. anonymous

Sorry my internet was creating problem at that time I was not getting any notifications also..

37. anonymous

See @ashna : You know atomic mass of He is 4: So: 1 mole of He = $$6.023 \times 10^{23}$$atoms Or 4g = $$6.023 \times 10^{23}$$atoms Here it is 4g.. Look for g here..

38. anonymous

Now I am explaining the third case that is 52 u.. There it was g(grams) and now it is u.. Helium has atomic mass of 4g. But if you write it as 4u, then it means 1 atom only.. I mean to say that 4u implies $$\color{red}{\text{One Atom of Helium}}$$ Where as 4g implies $$\color{blue}{{6.023 \times 10^{23} \text{Atoms of Helium= 1 Mole of Helium..}}}$$

39. anonymous

I give you other example: For Carbon the mass is 12. So: $$\color{green}{12g = 6.023 \times 10^{23} \text{Atoms of Carbon}}$$ But: $$\color{magenta}{12u \implies \text{1 Atom of Carbon..}}$$

40. anonymous

$$\color{navy}{\text{For third part now:}}$$ $$\color{silver}{\text{Helium has atomic mass of 4..}}$$ $$\color{cyan}{\mathcal{So:}}$$ $$\color{magenta}{4u \implies \text{1 Atom of Helium..}}$$ $$\color{pink}{\text{So,}}$$ $$\color{orange}{\mathsf{52 u ~\;will~ \; contain ~\; how ~\; many ~\; atoms ??}}$$

41. anonymous

$$\frak{\color{green}{\text{ashna},\color{blue}{\text{I suggest you to go through all you have studied about Mole Concept..}}}}$$ $$\color{red}{\mathsf{Have \;a \;look \; on \; all \; the \;work..}}$$ $$\color{green}{\text{How we solved each and every problem just go through once.}}$$ $$\color{magenta}{\text{And if you have any doubt then let me know..}}$$

42. anonymous

43. anonymous

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44. anonymous

Yep..