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If you want to create an electrical current, which situation would produce a solution capable of this

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.

What if it is did darwin used to support his theory of evolution