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29-09-2016
Chemistry

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How many atoms are in a sample of 72.8 grams calcium (Ca)?

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Willchemistry Willchemistry

29-09-2016

Atomic mass Ca = 40.078 a.m.u

40.078 g -------------------- 6.02x10²³ atoms
72.8 g ---------------------- ??

72.8 x ( 6.02x10²³) / 40.078 =

4.38x10²⁵ / 40.078 = 1.093x10²⁴ atoms

hope this helps!

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