Answer to Question #86401 in General Chemistry for mike

Question

At what temperature (in °C) would one liter of tetrafluoroethylene gas, C2F4, have a mass of 4.192 g, if the gas pressure is 0.8220 atm? Assume that the gas behaves ideally.

________ C

Answer 1

P(C₂F₄)×V(C₂F₄) = n(C₂F₄) ×R×T(C₂F₄)

R = 0.082 L×atm×mol^-1×K^-1

n(C₂F₄) = m(C₂F₄) / M(C₂F₄) = 4.192g / 100g/mol = 0.04192mol.

T(C₂F₄) = P(C₂F₄) × V(C₂F₄) / (n(C₂F₄) ×R) = 0.8220 atm × 1.0 L / (0.04192 mol × 0.082 L×atm×mol^-1×K^-1) = 239.1314 K ≈ 239.13 K.

t(C₂F₄) = T(C₂F₄) – 273.15 = (239.13 – 273.15)⁰C = –34.02⁰C.