Chemistry · THERMODYNAMICS

When both \( \Delta_r H^\circ > 0 \) and \( \Delta_r S^\circ > 0 \), what is the sign of \( \Delta_r G^\circ \) and the spontaneity of the reaction at high temperatures?

1. \( \Delta_r G^\circ < 0 \), spontaneous at high temperature
2. \( \Delta_r G^\circ > 0 \), nonspontaneous at high temperature
3. \( \Delta_r G^\circ = 0 \), remains at equilibrium at all temperatures
4. \( \Delta_r G^\circ < 0 \), nonspontaneous at high temperature