8. How many grams is 9.94 * 10 ^ 22 atoms of calcium (Ca) ?

6.61 grams Ca

Explanation:

Ca is monoatomic. Atomic mass 40.075

moles of Ca = 9.94x10^22/6.02214076x10^23 (avogadro number)

= 0.16506 mol = 6.61 grams

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