Question

What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 765 torr and 20.0 °C?

Answer 1

P*V=n*R*T
n=m/Mr
...............................

Answer 2

ok..i will work it out and see what i get..thank you

Answer 3

what is Mr?

Answer 4

what you are using for R??

Answer 5

note: convert units to mach units of R

Answer 6

r is 0.0821 no?

Answer 7

8.314 j / mol /K

Answer 8

so i did (765x16)=n(0.0821x293.15)

Answer 9

find n now

Answer 10

n24.07 so i divided to cancel 24.07

Answer 11

divided( 765x16)/24.07

Answer 12

508.51

Answer 13

taht's my moles soo...i did 508.51/19.0

Answer 14

R= 8.314 u have not took
from where u took R value

Answer 15

convert torr to N/m3
convert lt to m3

Answer 16

Mr=molar mass

Answer 17

correction:convert torr to N/m2

Answer 18

@mos1635 help the poor @Cardonuts614 as he is having final tomorrow bye good night

Answer 19

i get 26.7...but the right anwer is 28.4

Answer 20

i'm a she :-P

Answer 21

if R=0,082...lt*atm/mole*K
then convert torr to atm
and lt to lt (no need)

Answer 22

if R=8,314..joule/mole*K
convert torr to N/m2
convert lt to m3

Answer 23

what R you are using?

Answer 24

ok that's where i 'm confused...why is R = 8.314?? teacher told me it was 0.0821Latm/Kmol

Answer 25

deferant units
no matter

Answer 26

ok let's go with R=0.082 L*atm/K*mol

Answer 27

convert torr to atm

Answer 28

ok..give me a min and i'll try it again

Answer 29

what are you getting at?

Answer 30

i'm stuck...n=pv/rt right?

Answer 31

LOL yes

Answer 32

ok

Answer 33

\[\frac{ m }{ M }=\frac{ P*V }{ R*T }\]

Answer 34

.6714

Answer 35

that's what i got for n

Answer 36

n=m/Mr
Mr=m/n
......

Answer 37

got it!

Answer 38

19/0.6714=28.299...

Answer 39

the answer on the quiz was 28.4 but it's close enough

Answer 40

yes some times the deferences are due to how many decimals we are using....

Answer 41

that's right..

Answer 42

good luck with your final
BB

Answer 43

i'll need the luck. thank you.