(ii) An alloy of iron (53.6%), nick...
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(ii) An alloy of iron (53.6%), nickel (45.8%) and mangnese (0.6%) has a density of 8.17g cm-3. Calculate the number of Ni atoms present in the alloy of dimensions 10.0 cm x 20.0 cm x 15.0 cm. 3

JEE/Engineering Exams
Chemistry
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Density of an alloy ( =8.17 mathrm{g} / mathrm{cm}^{3} ) Volume of an alloy ( =10.0 mathrm{cm} times 20.0 mathrm{cm} ) ( times 15.0 mathrm{cm}=3000.000 mathrm{cm}^{3} ) Mass of an alloy = Density ( times V ) olume ( =8.17 g / mathrm{cm}^{3} times 3000.000 mathrm{cm}^{3}=24,510 mathrm{g} ) Percentage of nickel in alloy ( =45.8 % ) Mass of nickel= ( 24,510 g times frac{45.8}{100}=11,225.58 g ) Moles of nickel = ( frac{112,225.58 g}{58.69 g / m o l}=191.2690 mathrm{mol} ) Number of atoms of nickel: ( 191.2690 times 6.022 times 10^{23}=1.1518 times 10^{26} ) atoms The number of Ni atoms present in the alloyis ( 1.1518 times 10^{26} ) atoms.
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