Wt. f can someone help me... (what is the reaction _C₇H₆O₂ + _O₂ -->_CO₂ + _H₂O )

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

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?

In the experiment you asked to react hydrochloric acid and with sodium hydroxide. when measuring the volume of the reactants, which instrument would give the greatest precision.