How many atoms are in 137 g of calcium?

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Question:

How many atoms are in 137 g of calcium?

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Answer:2.047x 10²⁴  atomsExplanation:To calculate the n° of moles of Ca that they are in 137 g, we can use the next relation:n = mass/atomic mass = (137 g)/(40.078 g/mol) = 3.4 mol.For each mole of a molecule contains Avogadro's number of molecules (NA = 6.022 x 10²³).Using cross multiplication:1 mole of Ca contains → 6.022 x 10²³ atoms.3.4 moles of Ca contains → ??? atoms.∴ 3.4 mole of (137 g) Ca contain = (3.4 mol)(6.022 x 10²³) = 2.047x 10²⁴  atoms.

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