## anonymous 3 years ago uranium hexafluoride is a solid at room temperature, but it boils at $$56^o C$$.determine the density of uranium hexafluoride at $$60^o C$$ and 745 torr. i know d = m/v and PV = nRT but how can i use them here? or do i even use them here?

1. anonymous

you can solve for n and get the mass using the periodic table and then you can solve for v

2. anonymous

3. Carniel

Just get m and v :P

4. anonymous

how to get V?

5. anonymous

and m

6. Carniel

Use the other formula to find them ^_^

7. anonymous

how the heck can i get m o.O

8. anonymous

and V

9. anonymous

i dont think the "other formulas" can be applied

10. anonymous

can you demonstrate how>

11. NotTim

wats torr

12. anonymous

if i remember right 760 torr = 1 atm...torr is a unit of measurement for pressure

13. NotTim

p=745 torr v=? n=? R=? T=60-56 (i think) d=? (looking for) m=? v=?

14. NotTim

15. NotTim

on what @zbay say.

16. NotTim

but you still need m huh

17. anonymous

do you know $p =\rho \times r \times T \div M$ where rho is density and M is molecular mass

18. anonymous

P is pressure

19. anonymous

since n= m/M , you can get m/V = rho

20. anonymous

uhhh could you rewrite that equation you wrote? kinda vague... $\huge P = \frac{\rho RT}{M}$

21. anonymous

is that right?

22. anonymous

ya

23. anonymous

looks like it works :)

24. anonymous

how did you get this formula again?

25. anonymous

n=m/M right?

26. anonymous

oh i see now

27. anonymous

so $\frac{PM}{RT} = \rho$ right? R = 0.0821

28. anonymous

ya exactly

29. anonymous

so which T am i going to use?

30. anonymous

60?

31. NotTim

probably, because that's the one that applies to this situation

32. anonymous

the temperature at which u have to find density

33. anonymous

so what's 56 for? just a distraction?

34. anonymous

ya I guess

35. anonymous

hmm then i need to convert torr into atm and C into K right

36. anonymous

yup and 1 torr = 1 atm

37. anonymous

i thought it was 760 torr = 1 atm o.O

38. anonymous

oo idk

39. anonymous

hmm okay thanks

40. anonymous

what would be the unit?

41. anonymous

i got the answer as 126.76 g/L is that right?

42. NotTim

i dunno

43. anonymous

set n to 1 and solve for V then you take the molar mass of the molecule you are looking at and calculate your density

44. anonymous

R is a constant.