標題:
About Reacting Masses (20點*)
Caffeic acid is found in coffee beans.The molar mass of caffeic acid is found to be 180.2 gmol-1. Caffeic acid is found to contain 35.5% oxygen. How many oxygen atoms are present in one molecule of caffeic acid? [Relative atomic mass of O=16]
最佳解答:
Relative molecular mass of a ceffeic acid = 180.2 in which 180.2 x 35.5% = 63.97 units are contributed by oxygen Hence there are 4 oxygen atoms in one molecule of caffeic acid.
其他解答:
About Reacting Masses (20點*)
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發問:Caffeic acid is found in coffee beans.The molar mass of caffeic acid is found to be 180.2 gmol-1. Caffeic acid is found to contain 35.5% oxygen. How many oxygen atoms are present in one molecule of caffeic acid? [Relative atomic mass of O=16]
最佳解答:
Relative molecular mass of a ceffeic acid = 180.2 in which 180.2 x 35.5% = 63.97 units are contributed by oxygen Hence there are 4 oxygen atoms in one molecule of caffeic acid.
其他解答:
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