If this same atom with 22 protons and 19 electrons were to gain 3 electrons, the net charge on the atom would be

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Based on the equation and the information in the table, what is the enthalpy of the reaction?