A3.31 g sample of lead nitrate, pb(no 3 ) 2 , molar mass = 331 g/mol, is heated in an evacuated cylinder with a volume of 1.62 l. the salt decomposes when heated according to the equation: . assuming complete decomposition, what is the pressure in the cylinder after decomposition and cooling to a temperature of 300 k? assume the pbo takes up negligible volume.

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?