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1) 124g of 4 atoms of Phosphorus
No. of moles = given mass/molecular mass
No. of moles = 124g/4×31g
n = 124g/124g
n = 1 mole
2)34g of NH3
No. of moles = given mass/molecular mass
No. of moles = 34g/17g
No. of moles = 2 moles
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