If a stone dropped into a well reaches the water's surface after 3.0 second, how far did the stone drop before hitting the water

All of the following are part of the biosphere except

Asample of air with a volume of 2.20m3 at a pressure of 105 kpa and a temperature of 30c is cooled to 10c and the pressure is reduced to 75.0 kpa. what is the new volume? 6.9 1.34 2.56 43.0 2.88

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate