can we add the comment for the answer if the answer if incorrect? Currently it is only thumb up or down. Without able to communicate with the expert who answer the question, the communication is bad and can not give the feedback to expert as well.

We know that the water in humidification systems is not always pure, but we are targeting an absolute humity of 43.9 mg/L when the air hits the lungs. Assuming our unpure water is in an ideal solution with other material and we heat our humidification system to 50.0 celsius degree, what is the minimum mol fraction of water that can provide enough water vapour to the air to allow us to reach our target of 43.9 mg/L in the air phase? Assume atmospheric pressure is 101325 Pa. The molecular weight of water is 18.01528 g/mol.

The answer is 0.5298 or 53.0% (3 s.f.) the water pressure from steam table at 50 celsius degree is 12350 Pa.

How could we get this answer?