Answer:
1. a
2. a
3. b
4. c
Explanation:
The STP is the Standard conditions of Temperature and Pressure, in these conditions, T = 0°C and P = 1 atm. By the ideal gas law,
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
We can observe that pressure and volume are indirect proportional, so when one increase, the other decrease. so:
1. The pressure decreases from 1.15 atm to STP, 1 atm, thus the volume increases.
2. The pressure decreases from STP, 1 atm, to 0.5 atm, thus the volume increases.
3. The pressure increases from STP, 1 atm, to 1.25 atm, thus the volume decreases.
4. The pressure remains constant at 1 atm, thus the volume is unchanged.
