The elements nitrogen and oxygen are diatomic gases in their standard states. Therefore, the standard enthalpies of formation of these elements are zero. When nitrogen and oxygen gases react to form one mile of NO2, the enthalpy of the reaction

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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