Calculate the heat change at 100 ∘C in each of the following problems.

-Calculate the heat in calories needed to vaporize 30.0 g of water at 100 ∘C.
-Indicate whether heat was absorbed or released in situation above.

1.from liquid state to gaseous state is evaporation 3.solid to liquid is melting 5. solid to gaseous state is sublimation 6. gas to solid state is decomposition 7. a change of state is known as the states of matters

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.

Thermohaline circulation and gyres