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Calculate the number of moles present in 

(a) 60 g of calcium. 

(b) 3.011 × 1023 number of oxygen atoms. 

[Given that Ca = 40 u; Avogadro number, NA = 6.022 × 1023 per mole] 

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(a) Number of moles of Ca = Given mass of calcium / Molar mass of calcium = 60 / 40 = 1.5 moles 

(b) Number of moles = Given number of molecules / 6.022×1023 = 3.011×1023 / 6.022×1023 = 0.5mol

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