Final answer:
To determine the total pressure of a mixture of He and Ne, we need to know either the partial pressures or the total pressure of the mixture.
Step-by-step explanation:
To determine the total pressure of the mixture of He and Ne, we can use the concept of partial pressure. The total pressure of the mixture is equal to the sum of the partial pressures of each component. To find the partial pressures, we can use the formula:
Partial pressure = (moles of component / total moles) * total pressure
In this case, we have 0.400 mole of He and 0.600 mole of Ne in a 2.00 liter container at 25°C. The total moles of the mixture is 0.400 mol + 0.600 mol = 1.000 mol. Using the formula, we can find the partial pressures of He and Ne:
Partial pressure of He = (0.400 mol / 1.000 mol) * total pressure
Partial pressure of Ne = (0.600 mol / 1.000 mol) * total pressure
Since the total pressure of the mixture is unknown, we don't have enough information to calculate it. We need to know the values of the partial pressures or the total pressure in order to solve this problem.