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14-09-2016
Chemistry

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How many atoms are in 121 g of calcium?

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Willchemistry Willchemistry

14-09-2016

Atomic mass Ca = 40.078 u.m.a

40.078 g --------------- 6.02x10²³ atoms
121 g ------------------- ??

121 x ( 6.02x10²³) / 40.078 =

7.28x10²⁵ / 40.078 = 1.81x10²⁴ atoms

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