# Question #e7184

##### 1 Answer

Jul 25, 2017

#### Answer:

On average, the pressure dropped by 0.83 bar each day.

#### Explanation:

From the **Ideal Gas Law**, you know that

Thus,

The number of moles,

This means that, if the mass decreases by a certain factor, the pressure will decrease by the same factor.

Here, the mass has decreased to 10 kg from 15 kg, a factor of

The pressure will decrease by the same factor.

Hence, the new pressure will be

The drop in pressure is

This pressure drop occurred over four days.

∴ The average pressure drop per day was