"P_{total}=P_A+P_B=1.197\\ atm"
Now from ideal gas equation
"PV=nRT\\\\n=\\frac{PV}{RT}=\\frac{1.197\\times 7.45}{0.082057\\times 286}=0.38 \\ mole"
so,
"n_A+n_B=0.38"
Now ,
"P\u00b0_C=\\frac{n_CRT}{V}=\\frac{0.12\\times 0.0821\\times 286}{7.45}=0.3782\\ atm\\\\P_C= x_C\\times P\u00b0_C=\\frac{n_C}{n_A+n_B+n_C}\\times 0.3782"
"=\\frac{0.12}{0.38+0.12}\\times 0.3782=0.09\\ atm"
Partial fraction of gas C = "0.09\\ atm"
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