A(n) 0.65 mole quantity of O2 originally at 85◦C is cooled such that it now occupies 4.0 L at 20.◦C. What is the final pressure exerted by the gas? 1. 1.1 atm 2. 6.2 atm 3. 0.27 atm 4. 3.9 atm 5. 0.92 atm 6. Not enough information is given

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

What is the measure of a change in an objects velocity?

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.