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Q.

Pressure exerted by a  mixture of  4g  of  O2  and  2g  of  H2  confined in a bulb of 1 litre at 0°C   is

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a

31.205 atm

b

25.215 atm

c

45.215 atm

d

15.210 atm

answer is A.

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Detailed Solution

The pressure can be calculated using the ideal gas equation:

P = (nRT) / V

Step 1: Calculate the moles of O2 and H2

Moles of O2:

Molar mass of O2 = 32 g/mol
Moles of O2 = Mass / Molar mass = 4 / 32 = 0.125 mol

Moles of H2:

Molar mass of H2 = 2 g/mol
Moles of H2 = Mass / Molar mass = 2 / 2 = 1 mol

Step 2: Total moles of gas in the mixture

ntotal = nO2 + nH2 = 0.125 + 1 = 1.125 mol

Step 3: Calculate the pressure using the ideal gas equation

P = (nRT) / V

Substituting the values:

P = (1.125 × 0.0821 × 273) / 1
P = 25.215 atm

Final Answer: 25.215 atm (Option a)

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