A 4.96lb-mole of gas mixture may consist of 60%C1, 25%C2 and 10%C3 by weight, when its reservoir pressure and temperature are 2000psi and 150F. respectively. Does impurity exist in the gas mixture? If yes, select your answer below, and then calculate gas mixture viscosity by Carr's Method. A- Carbon Dioxide B. Hydrogen Sulfide C. Nitrogen