Which set of the following contains only TRUE statements:
A. It is usually more convenient to measure ΔE than ΔH.
B."Hot packs" used by skiers and others for warmth are based on the crystallization of sodium acetate from a highly concentrated solution. The sign of ΔH for this crystallization is positive.
C. The work done when a system expands against a constant external pressure is assigned a negative sign.
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