A sample of pure gold has a mass of 15.8 g. Calculate the number of moles in the sample and gold atoms in the sample.   (a) moles in the sample  ?moles (b) gold atoms in the sample  ?atoms

Calculate the temperature T of a sample of gas when the average translational kinetic energy of a molecule in the sample is 8.23 x 10-21 J. T = K What is the total translational kinetic energy Krans of all the molecules of this sample when it contains 2.21 moles of gas? Ktrans = J

A runner weighs 550 N and 71% of this weight is water. (a) How many moles of water are in the runner's body? (b) How many water molecules (H₂O) are there? (a) Number (b) Number i Units Units

buckminsterfullerene, c60, is a large molecule consisting of 60 carbon atoms connected to form a hollow sphere. the diameter of a c60 molecule is about 7 x 10–10 m. it has been hypothesized that c60 molecules might be found in clouds of interstellar dust, which often contain interesting chemical compounds. the temperature of an interstellar dust cloud may be very low, around 3 k. suppose you are planning to try to detect the presence of c60 in such a cold dust cloud by detecting photons emitted when molecules undergo transitions from one rotational energy state to another. approximately, what is the highest-numbered rotational level from which you would expect to observe emissions? rotational levels are l= 0,1,2,3,..