Answer:
The answer to your question is V2 = 2.5 l
Step-by-step explanation:
Data
Volume 1 = V1 = 3 l
Temperature 1 = T1 = 78°C
Volume 2 = V2 = ?
Temperature 2 = T2 = 20°C Standard temperature = 20°C
Process
To solve this problem use Charles' law
V1/T1 = V2/T2
-Solve for V2
V2 = V1T2 / T1
1.- Convert the temperature to °K
T1 = 78 + 273 = 352°K
T2 = 20 + 273 = 293°K
2.- Substitution
V2 = (3 x 293) / 352
3.- Simplification
V2 = 879/352
4.- Result
V2 = 2.5 l