Fr-223 undergoes alpha decay and produced-8.9x10° kJ/mol of energy in the process. Determine the actual mass (in g/mol) of the produced At-219 nucleus. Express your answer in 2 decimal places. Do not write the units. Mass of Fr-223 = 223.020 g/mol; Mass of He-4 4.003 g/mol Mass of proton = 1.0078 amu; Mass of neutron = 1.0087 amu
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