3. 1.52 atm mL
1.52 atm

13. C9H11NO4
(9x12)+(11x1)+(14x1)+(16x4) = 197g/mol

17. a P1 T1 P2 T2 B C 3.25 atm 298 K 4.34 atm 398 K 550 mm Hg 273 KP1 T1 P2 T2 a
3.25 atm
298 K
4.34 atm 
398 K B
550 mm Hg
273 K
0.459 atm
-100 oC C
0.5 atm
250 K
955 mm Hg
625 K 

23. L

24. b.
 P1 V1 are both fine as is              T1, P2 and T2 both need to be converted.
T1 and T2 simply add 273 to convert C to K, so T1 = 278 K and T2 = 323K
for P2 1atm = 760mm Hg so 700mmHg x 1atm/760mmHg = 0.921atm
Now that they are all in the correct units you solve gay-lusac's law to solve for V2.
P1V1/T1 = P2V2/T2, cross multiply and you get P1V1T2 = P2V2T1.  Isolate V2 and you get V2 = P1V1T2/P2T1. 
Put in your variables and you get (1.2atm)(75L)(323K) / (0.921atm)(278K) =  L