Question

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?

Answer 1

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

Answer 2

will you please elaborate?

Answer 3

Just get m and v :P

Answer 4

how to get V?

Answer 5

and m

Answer 6

Use the other formula to find them ^_^

Answer 7

how the heck can i get m o.O

Answer 8

and V

Answer 9

i dont think the "other formulas" can be applied

Answer 10

can you demonstrate how>

Answer 11

wats torr

Answer 12

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

Answer 13

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

Answer 14

Oh...Waht about Mm?

Answer 15

on what @zbay say.

Answer 16

but you still need m huh

Answer 17

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

Answer 18

P is pressure

Answer 19

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

Answer 20

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

Answer 21

is that right?

Answer 22

ya

Answer 23

looks like it works :)

Answer 24

how did you get this formula again?

Answer 25

n=m/M right?

Answer 26

oh i see now

Answer 27

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

Answer 28

ya exactly

Answer 29

so which T am i going to use?

Answer 30

60?

Answer 31

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

Answer 32

the temperature at which u have to find density

Answer 33

so what's 56 for? just a distraction?

Answer 34

ya I guess

Answer 35

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

Answer 36

yup and 1 torr = 1 atm

Answer 37

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

Answer 38

oo idk

Answer 39

hmm okay thanks

Answer 40

what would be the unit?

Answer 41

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

Answer 42

i dunno

Answer 43

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

Answer 44

R is a constant.