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If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Write balanced nuclear equations for the formation of five elements whose atomic number is between helium (2) and iron (26):