Answer:
Statement A is correct. Decreasing the volume of a gas from 4.0 L to 2.0 L while keeping moles the same.
Step-by-step explanation:
Step 1: Data given
Pressure of a gas is doubled
Temperature stays constant
Step 2:
P1*V1 / n1 = P2*V2/n2
⇒with P1 = the initial pressure = 1.0 atm
⇒with V1 = the initial volume
⇒with n1 = the initial number of moles gas
⇒with P2 = the final pressure = 2.0 atm
⇒with V2 = the final volume
⇒with n2 = the final number of moles
Decreasing the volume of a gas from 4.0 L to 2.0 L while keeping moles the same.
Suppose the initial number of moles = 2.0 moles
1.0 * 4.0 / 2.0 = 2.0 *2.0 / n2
The final number of moles n2 = 2.0 moles = the same
This statement is true
Increasing the volume of a gas from 2.0 L to 4.0 L while keeping moles the same.
Suppose the initial number of moles = 2.0 moles
1.0 * 2.0 / 2.0 = 2.0 *4.0 / n2
The final number of moles n2 = 8.0 moles = not the same
This statement is false
C) Doubling the number of moles of gas present while decreasing the volume from 2.0 L to 1.0
Suppose the initial number of moles = 2.0 moles
1.0 * 2.0 / 2.0 = 2.0 *1.0 / n2
The final number of moles n2 = 2.0 moles = the same
This statement is false
D) Doubling both the moles of gas and the volume of gas.
Suppose the initial number of moles = 2.0 moles
The initial volume = 1.0 L
1.0 * 1.0 / 2.0 = 2.0 *2.0 / n2
The final number of moles n2 = 8.0 moles = not the same
This statement is false
Statement A is correct. Decreasing the volume of a gas from 4.0 L to 2.0 L while keeping moles the same.