For a sunscreen product with equal amounts of tdsa and 2-ehmc to provide adequate protection from uv-a and uv-b rays for 1.00 h, how many molecules of tdsa and 2-ehmc must be present on 0.45 m2 of skin? assume one molecule of tdsa and one molecule of 2-ehmc can each absorb 10,000 photons per hour. assume the photon rate is the same as in part c, 3.066×1021 photons/(m2⋅s) .

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explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)