A closed cylinder contains 850 mL of orygen gas at 790 mmHg pressure and 20'c tempore Calculate the mass of oxygen in that cylinder. (R = 0.0821 lit. atm. Kimer') Solution: $50 ml =0.85 lit) .

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.