Question 10 -16 Which of the following samples has the most molecules of gas? 1)

Question

Question 10 -16 Which of the following samples has the most molecules of gas? 1) 1,00 L of CH4 at STP 2 1.00 L of O2 at STP 3) 1.00 L of N2 at STP 3) 1·00 L of CO2 at STP All these would have the same number of molecules Question 11 One mole of oxygen gas is at one atmosphere of pressure and 10 oC. How can a scientist increase the pressure of the gas? Decrease the temperature and hold volume constant 2) Increase the volume constant and decrease the temperature 3) Decrease the volume and increase the temperature 4) hold temperature constant and increase the volume

Explanation / Answer

Ans. #10. Correct option- 5. All these would have the same number of molecules.

Following Avogadro’s Law, equal volume of all gases have equal number of moles at constant pressure and temperature.

Since the volume of all gases is the same (1.0 L), the number of molecules in them would also be the same.

#11. Correct option - 3

Option 1, 2. Incorrect. Gay-Lussac’s law states that the pressure of a fixed mass of gas at constant volume is directly proportional to its absolute temperature. So, decrease in temperature decrease the pressure.

Option 3. Correct. Increase in temperature simultaneously with decreasing volume (i.e. reducing the initial volume) increases pressure.

Option 4. Following Boyle’s law the pressure of a certain mass of an ideal gas (n constant) is inversely proportional to its volume at fixed temperature.

That is increase in volume (n, T constant) decreases the pressure.

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