If a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between them? from the
2 answers:
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There are 4 hydrogens on the right side , and 2 hydrogens on the left per molecule of
. To get the same number of hydrogens on both sides, the coefficient should be 2.
(Then the number of oxygens will be consistent, since contributes 2 oxygens, and so does
.)
