Calculate the change in enthalpy for the mg hcl
Calculate the change in enthalpy for the Mg HCl reaction using standard enthalpies of formation delta hf for HCl aq equals -167.2 kj and delta hf for MgCl2 aq equals -791.2 kj?
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A radioactive substance has a half-life of 46.5 minutes. How many grams of the radioactive substance will remain in a 822.4g sample after four hours have elapsed?
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