For a mixture of I mole He and 1 mole Ne, select the correct statements(s)

Options

A. pressure is same
B. temperature is same
C. volume is same
D. pressure,temperature,volume and no. of molecules are same

Answer

To solve the question regarding the mixture of 1 mole of Helium (He) and 1 mole of Neon (Ne), we need to analyze the properties of the gases under standard temperature and pressure (STP) conditions.

### Step-by-Step Solution:

1. **Understand the Conditions**:
- Standard Temperature and Pressure (STP) is defined as a temperature of 273 K and a pressure of 1 atm.

2. **Determine the Number of Particles**:
- For 1 mole of any gas, the number of particles is given by Avogadro's number, which is approximately \(6.022 \times 10^{23}\) particles.
- Therefore, for 1 mole of Helium, the number of particles is \(6.022 \times 10^{23}\).
- Similarly, for 1 mole of Neon, the number of particles is also \(6.022 \times 10^{23}\).

3. **Calculate the Volume of Each Gas**:
- Under STP conditions, 1 mole of an ideal gas occupies a volume of 22.4 liters.
- Thus, the volume of 1 mole of Helium is 22.4 liters.
- The volume of 1 mole of Neon is also 22.4 liters.

4. **Analyze the Mixture**:
- When we mix 1 mole of Helium and 1 mole of Neon, we have a total of 2 moles of gas.
- The total volume of the mixture at STP will be the sum of the volumes of the individual gases:
\[ \text{Total Volume} = \text{Volume of He} + \text{Volume of Ne} = 22.4 \, \text{L} + 22.4 \, \text{L} = 44.8 \, \text{L} \]

5. **Conclusion**:
- The mixture at STP has a total of 2 moles of gas, with each gas contributing equally to the number of particles and volume.
- Therefore, the correct statement regarding the mixture is that the temperature, pressure, number of molecules, and volume all remain consistent with the properties of ideal gases at STP.

### Final Answer:
The correct statement(s) regarding the mixture of 1 mole of Helium and 1 mole of Neon is that at STP, the temperature, pressure, number of molecules, and volume are the same for both gases.

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