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Date:
Worksheet: Gas Law Calculations-Density'Molar Mass, Partial Pressures
1
. A sample
of gas of mass 2.929 g occupies a volume of 426 mL at
molecular weight of the gas?
[{: y
ry:1 r
a.qTuL
Y
OoC
and 1 .00 atm pressure. What is the
ootzoux 217
l5 {
! lrno\
I ntyrr
2.
Anunknown gas has
a
density of 3.167 g/L
(GP)What
is the identity of the gas? (Ar,
t'10
tr{ :
1lv1
g
f .0(20u
1f
|
r
02, C!2,HF, HzO)
3L 1t zo
13
111
^hnn
(Oand
3. Two flasks
r,#3
gas at
contain.
are co3rycted with a stopcock. The first flask has a volum"
of frS?hr. The ,""ond flask has a volume of 8.0L and contaMxygen gas at a presiure of
1.25 atm. TheVmlerature of the whole system is maintained at 25oC. When the stopcock between the
flasks is opened and the gases are free to mix, what will the pressure be inlhe resulting mixture?
a pressure
1='lft
r-T
NZ
tL
,L
o.1Sa[nn',
r ./"
5(hry\
,il-t ;
1,1:
f.t5
nrl-t L\g
1 yno I
v
l'ls r 8 'v\
% x lsL =
1/
0'o[']0tr Y Lq(
i= 4 q^il')
-
Vr Lt?
f-t
r
0.110'lwrol
4. If I place 3.0 moles of Nz and 4.0 moles of Oz in a35L container
pressure of the resulting mixture of gases be?
\ ytl: 0.SLtl rUlqtr
at a temperature of 25oC, what
l'Otratvlr
rl
will the
The following two problems will deal with collecting gas over water. This means that the total pressure is equal
to sum of the partial pressures of the collected gas and the water. You will need to modiff your pressures so
that you are only evaluating the gas collected.
Ptotul
:Pg**
Puzo
5. Ammonium nitrite decomposes upon heating to form N2 gas: NHaNO2(s) ) Nz(g) + 2HzO(l)
When a sample of ammonium nitrite is decomposed in a test tube, 5l I mL of N2 gas is collected over water
at26o C and 745 torr total pressure. How many grams of ammonium nitrite decomposed?
{
(t
*l qi 'Ls ' 1Loh,r =
^ A.t-r
o'q
11
-l
4h41
@
lAru
04"t1
/
O5]l =nrVtLq\
/l :
0 .0 \11 rvrr I N z-
)
0.0\411440[ Nl+'1
lw
z.,
/ 9,\ )
l/1' \
sample of KCIO3 is partially decomposed, producing 02 gas that is collected over water. The volume of
gas collected is 0.250L at26o C and 765 torr total pressure. (The pressure of water vapor at26"C is 25 torr.)
a. How many moles of Oz are collected?
b. How many grulms of KCIO3 were decomposed?
6. A
V
t =1us - z S =
[=
1-10
a OO 117
[YCto, 4LVct
bvr.--\ o'11{nr*"
vv\olt
+50t
lo t
tt
Jp(,
r
0"00 ql)n^d
!or
y
\?,?.lt
\rvrt