Using the information in Model 2, calculate ΔHrxn for the combustion of ethanol (C2H5OH(l)). Substance H f (KJ/mol)
CO2 (g) –393.51
H2O(l) –285.83
C2H5OH (l) –277.69

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?