A change in temperature or color are two signs that a chemical reaction has taken place.
Answer:

Explanation:
Hello there!
In this case, according to the given information, it will be possible for us to use the Dalton's law, in order to solve this problem. However, we first need to calculate the mole fraction of oxygen by firstly calculating the moles of each gas:

Next, we calculate such mole fraction as follows:

Then, given the following equation:

So we solve for the total pressure as follows:

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It works by moving the water molecules to the place of low concentration until it reaches equilibrium.
hope it helps