Which substance has a high melting point and conducts electricity in the liquid phase

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.