Δtf = kf × m this formula relates the drop in freezing point (δtf) to the molal freezing point depression constant (kf) and the molal concentration of the solute (m). under which conditions does this formula apply? when the mass of the solvent equals 1 kg when the solute is ionic, not molecular when the solute is molecular, not ionic when the solvent is water, not other liquids

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s