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Atomic Mass and Atomic Mass Unit

how many atom...

Question

how many atoms of calcium are there in 2g of calcium ?

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Solution

Molar mass of calcium = 40 g
Number of moles in 2 g calcium = mass/molar mass
= 2/40 = 0.05

Number of atoms in 1 mole of calcium = 6.022 x 10²³
Number of atoms in 0.05 moles of calcium = 0.05 x 6.022 x 10²³
= 3.011 x 10²²

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