madeleinejjj9168 madeleinejjj9168

13-06-2017
Chemistry

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How many atoms are in 149 grams of calcium?

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kirstendg1or8kwg kirstendg1or8kwg

14-06-2017

Atomic mass Calcium => 40.078 u.m.a

40.078 g -------------------- 6.02x10²³ atoms

149 g ------------------------ ?? atoms

149 x (6.02x10²³) / 40.078 => 2.23x10²⁴ atoms of Ca

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