Homework Answers
Calcium Carbonate CaCO3
atomic weight of Ca = 40.078
atomic weight of C = 12.0107
atomic weight of three O = 3 x 15.9994 = 47.9982
Molar mass of CaCO3 = 40.078 + 12.0107 + 47.9982 = 100.0869 amu (atomic mass units)
Bromous acid HBrO2 :
atomic weight of H = 1.00794
atomic weight of Br = 79.904
atomic weight of two O = 2 x 15.9994 = 31.9988
Molar mass of HBrO2 = 1.00794 + 79.904 + 31.9988 = 112.903594 amu (atomic mass units)
Caffeine (C8H10N4O2)
atomic weight of eight C = 8 x 12.0107 = 96.0856
atomic weight of ten H = 10 x 1.00794 = 10.0794
atomic weight of four N = 4 x 14.0067 = 56.0268
atomic weight of two O = 2 x 15.9994 = 31.9988
Molar mass of CaCO3 = 96.0856 + 10.0794 + 56.0268 + 31.9988 =194.1906 amu (atomic mass units)
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