During a heating process, 400 J of heat was absorbed by a 210 g block of iron (c iron = 0.449 J/g·°C). If the block started at room temperature (298 K), what will the final temperature be?

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

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