Standard molar entropies
You are given pure samples of ethane, C2H6(g), and toluene, C7H8(l). What prediction would you make concerning their standard molar entropies at 298 K?
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A 95 g ball on a 60 cm long string is swung in a vertical circle about a point 200 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height of 600 cm above the floor.
A fixed quantity of gas at 24^circ C exhibits a pressure of 758 torr and occupies a volume of 5.12 L. Calculate the volume the gas will occupy if the pressure is increased to 1.89 atm while the temperature is held constant.
The coefficient of kinetic friction between the 48.0 kg block and incline is 0.250. Determine the change in the kinetic energy of the 48.0 kg block as it moves from A to B, a distance of 20.0 m.
Given that the cuvette used in the measurement has a pathlength of 1.00 cm, determine the extinction coefficient of compound A at 460 nm.
What volume of sodium thiosulfate and water are needed to make an approximate 0.10 M solution starting with 1.0 M sodium thiosulfate solution?
An absorbance of 0.395 at 460 nm is measured for a solution of compound A with an unknown concentration. If the same sized cuvette is used, what is the concentration of compound A in this solution?
A block falls from rest from the top of a 178-m-high building. When the block is 58.0 m above the ground, a man, 1.90 m tall, standing directly underneath, sees the block. How much time does he have to react to avoid being hit?
The second -order decomposition of NO2 has a rate constant of 0.255 M-1S-1. How long will it take for 75% of NO2 to decompose if the initial concentration of NO2 is 1.33M?
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