What is the force required to pull a spring 0.5m if the spring constant is -3N/m

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

Kp is the equilibrium constant for dissociation of the propionic acid dimer. what is the sign of the slope for a plot of the natural logarithm of kp vs. inverse temperature for this reaction?

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?