In order to find the missing value in this question, we need to use what is called the Combined Gas Law formula, which is formula that combines all three common gas laws, the formula is:
P1V1/T1 = P2V2/T2
We have:
P1 = 100 kPa
V1 = 2.0 L
T1 = 15°C, but we need it in Kelvin, 288 K
P2 = ?
V2 = 2.5 L
T2 = 273 K
Now we add these values into the formula:
100 * 2/288 = P2 * 2.5/273
0.6944 = 2.5P2/273
2.5P2 = 0.6944 * 273
2.5P2 = 189.57
P2 = 189.57/2.5
P2 = 75.828 kPa, we can round it to 76 kPa
The pressure will be 76 kPa