GENERAL CHEMISTRY I & LAB
CHEM-UA 125
EXAMINATION 2
November 7, 2025
Do not begin until you are told to do so.
Completely fill out your identification data on the cover
as soon as the exam begins.
Partial credit cannot be given unless you show all work.
Clearly indicate your answers, show their units,
and use the proper number of significant digits.
There are four (4) questions on ten (10) pages.
When you begin, verify that your exam is complete.
Notify a proctor if you are missing any pages.
prob | value | score | grader
1 25 |
2 26
3 25
4 24
' total | 100
PRINT NAME {< E y - RECITATION SECT:
1D NUMBER_N RECITATION INSTR:
I have neither given nor received unauthorized aid on this examination:
SIGNATURE:
Your completed exam paper will be photocopied.
, (total: 25 points)
1y
a) A sample of argon (Ar(g)) occupies a volume of 7.25 L at 35.0°C and 1.95 atm. What
volume (in L) will the sample occupy at 75. 8 °C and 2.TM
65 atm? (8 points)
PL;Z““
’95“{”
Pl
V, 27 |
v,z 7.5L
5
. 35,0°¢+278. M= J08BK T, =758 g e+ 273,052 348.:5‘5
WM’ =
P,V. —
=
1.
ePv
= P V»‘.
e
‘
wiTH 1 €O
PV—nPsT -
(= PUTe | (seA)a2suteIsk
BT, (2,65 o7h) (308 15K)
=§.041263L.
[6.0¢L |
b) A sample of a uranium fluoride (UF) is found to effuse at the rate of 17. 70 mL/min. Un-’
der comparable conditions, gaseous I, effuses at the rate of 20. 85 mL/min. Calculate the
molar mass of the uranium fluoride and predict its molecular formula from the given ef-
fusion data.
(7 points)
(I,_) = 2(126.90447 Jly+t) = 25380824 Jimel
1z, _ [MAve - MMys __(V\a:fl, t
fon Mz, ~n,F,‘) iz, M= (M=, )
MMVF;(
(208"
70754y (Z
l-’
) gov9A-Jlamt)
a ) = 352,18¢335
Aol
=[352.2§mer | b it
MM (V) = 23804831 Zlgpat
MA(F) =18, 998 403 16535n4
1639 I’/ 352, 188335 Jlwe/
= J5Z,1
MMys, = 238,028 dlmy * % (18, 938109
252186335 Dipvi- 23802000004, . U4ISTHLS _ £ 00679) 2 4
18,0384 03163 Hma} /8.008403163
THE MOLECULAR. FomMULA 1§ UFé I
s
This problem continues on the following page.
CHEM-UA 125
EXAMINATION 2
November 7, 2025
Do not begin until you are told to do so.
Completely fill out your identification data on the cover
as soon as the exam begins.
Partial credit cannot be given unless you show all work.
Clearly indicate your answers, show their units,
and use the proper number of significant digits.
There are four (4) questions on ten (10) pages.
When you begin, verify that your exam is complete.
Notify a proctor if you are missing any pages.
prob | value | score | grader
1 25 |
2 26
3 25
4 24
' total | 100
PRINT NAME {< E y - RECITATION SECT:
1D NUMBER_N RECITATION INSTR:
I have neither given nor received unauthorized aid on this examination:
SIGNATURE:
Your completed exam paper will be photocopied.
, (total: 25 points)
1y
a) A sample of argon (Ar(g)) occupies a volume of 7.25 L at 35.0°C and 1.95 atm. What
volume (in L) will the sample occupy at 75. 8 °C and 2.TM
65 atm? (8 points)
PL;Z““
’95“{”
Pl
V, 27 |
v,z 7.5L
5
. 35,0°¢+278. M= J08BK T, =758 g e+ 273,052 348.:5‘5
WM’ =
P,V. —
=
1.
ePv
= P V»‘.
e
‘
wiTH 1 €O
PV—nPsT -
(= PUTe | (seA)a2suteIsk
BT, (2,65 o7h) (308 15K)
=§.041263L.
[6.0¢L |
b) A sample of a uranium fluoride (UF) is found to effuse at the rate of 17. 70 mL/min. Un-’
der comparable conditions, gaseous I, effuses at the rate of 20. 85 mL/min. Calculate the
molar mass of the uranium fluoride and predict its molecular formula from the given ef-
fusion data.
(7 points)
(I,_) = 2(126.90447 Jly+t) = 25380824 Jimel
1z, _ [MAve - MMys __(V\a:fl, t
fon Mz, ~n,F,‘) iz, M= (M=, )
MMVF;(
(208"
70754y (Z
l-’
) gov9A-Jlamt)
a ) = 352,18¢335
Aol
=[352.2§mer | b it
MM (V) = 23804831 Zlgpat
MA(F) =18, 998 403 16535n4
1639 I’/ 352, 188335 Jlwe/
= J5Z,1
MMys, = 238,028 dlmy * % (18, 938109
252186335 Dipvi- 23802000004, . U4ISTHLS _ £ 00679) 2 4
18,0384 03163 Hma} /8.008403163
THE MOLECULAR. FomMULA 1§ UFé I
s
This problem continues on the following page.
