50.0 dm3 of dry air was slowly bubbled through a thermally insulated beaker containing 250 g of water initially at 25°C. Calculate the final temperature. (The vapour pressure of water is approximately constant at 3.17 kPa throughout, and its heat capacity is 75.5 J K-i mol-1. Assume that the air is not heated or cooled and that water vapour is a perfect gas.)