That is intended to be a negative charge sign after the hydrogen in the first OH and the 2 is supposed to be a subscript. If you wouldn't mind explaining the steps of how you got your answer, I would really appreciate it. Thank you so much!
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1 Ca atom has a mass of 40.1 u
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The (OH)2 part can be calculated this way:
2 O = 32.0 u
2 H = 2.0 u
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Total = 34.0 u
Total of both parts = 74.1 u
Percent OH = 34.0 / 74.1 = 45.9 %
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The (OH)2 part can be calculated this way:
2 O = 32.0 u
2 H = 2.0 u
-------------
Total = 34.0 u
Total of both parts = 74.1 u
Percent OH = 34.0 / 74.1 = 45.9 %