The cylinder contains helium gas, the mass of which is 200g. at a temperature of 20 C. What is its internal energy equal to?
| August 6, 2021 | education
Task data: m (mass of helium in the cylinder) = 200 g; T (absolute temperature of helium) = 293 K (20 ºС).
Constant data: i (the number of degrees of freedom of molecules of the monatomic gas of helium) = 3; M (molar mass) ≈ 4 g / mol; R (universal gas constant) = 8.31 J / (mol * K).
The internal energy of helium in the cylinder can be determined by the formula: Q = 0.5 * i * (m / M) * R * ΔТ.
Calculation: Q = 0.5 * 3 * (200/4) * 8.31 * 293 ≈ 182.6 kJ.
Answer: The internal energy of helium is 182.6 kJ.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.
