How will temperature affect the spontaneity of a reaction with positive H and S? A. It will be spontaneous only at T = H/S.
B. Changing the temperature will not affect spontaneity.
C. A low temperature will make it spontaneous.
D. A high temperature will make it spontaneous.

Option A. Spontaneous only at T = H/S

Explanation:

At constant temperature and constant pressure, the change Gibbs free energy is defined as:

Δ G  =  Δ H  −  t Δ S

If the change in Gibbs free energy is negative, then the reaction will be spontaneous.

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a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.