218 -- If the following reaction takes place inside a cylinder with a movable piston, how many of the following statements about it are correct?
$$\mathrm{N_2H_4(g) + ClF_3(g) \rightarrow HF(g) + N_2(g) + Cl_2(g)}, \quad \Delta H < 0$$
(The equation is balanced.)
- $\Delta E$ equals $q + w$.
- $\Delta H$ equals $\Delta E - w$.
- The signs of $\Delta S$ and $\Delta G$ are negative.
- The system does work on the surroundings, and $w$ is positive.
- The sum of the stoichiometric coefficients of the substances in the balanced equation equals 24.
(1) 2 (2) 3 (3) 4 (4) 5