A bar gold-197 has a mass of 1.0 kg. Calculate the number of moles of gold in the bar. (An atom of gold contains 197 nucleons and has a mass of 197u. 1u is 1.66x10^-27kg. Avogadro constant, NA is 6.02 x 10^23 mol^-1)
5.1 mol
Nitrogen consists of molecules N2. The molar mass of nitrogen is 28 g/mol. For 100 g of nitrogen, calculate the volume occupied at room temperature and pressure (20℃; 1.01 x 10^5 Pa). (universal molar gas constant, R, is 8.31 J/mol K) )
0.086 m^3
Calculate the mean translational kinetic energy of atoms in an ideal gas at 27℃. (Boltzmann constant, k =1.38 x 10^23 J/K)
6.21x10^25 J
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