iran-konkur 2020 Q218

iran-konkur · Other · konkur-riazi_1399_specialized_old-curriculum Not Maths
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
\textbf{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.)

\begin{itemize}
    \item $\Delta E$ equals $q + w$.
    \item $\Delta H$ equals $\Delta E - w$.
    \item The signs of $\Delta S$ and $\Delta G$ are negative.
    \item The system does work on the surroundings, and $w$ is positive.
    \item The sum of the stoichiometric coefficients of the substances in the balanced equation equals 24.
\end{itemize}

\begin{center}
(1) 2 \qquad (2) 3 \qquad (3) 4 \qquad (4) 5
\end{center}