In a vessel with a capacity of 50 liters at a temperature of 20C there is 400 g of helium. Determine the helium pressure.

To solve the problem, you need to use the Mendeleev equation:
P * V = (m * R * T) / (j * u);
Let’s transform the equation:
P * V = (m * R * T) / (j * u * v);
Let’s substitute:
P = (0.4 * 8.31 * 293) / (4 * 10 ^ -3 * 5 * 10 ^ -2);
P = 974/2 * 10 ^ -4;
P = 487 * 10 ^ 4;
P = 4.87 * 10 ^ 6;
Answer: P = 4.87 * 10 ^ 6