Question

How many moles are in 5.77 grams of calcium

Answer 1

• The number of moles  that are in 5.77 grams of calcium  is ($8.677*10^{22}$)

• From periodic table, Avogadro's number of atom of calcium has a mass approximately ( 40.1 g)

Given:

• Mass of calcium= 5.77 grams

• Number of calcium atom =  $\frac{5.77g}{40.1g}$ × ( Avogadro's number)

(Avogadro's number= 6.022 × 10^23 mol$^{-1}$

Number of calcium atom= $\frac{5.77g}{40.01g}$× 6.022 × $10^{23}$ $mol^{-1}$

= 8.677× 6.022 $10^{22}$

Therefore, number of moles  that are in 5.77 grams of calcium  is (8.677 × 10^22)

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