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Molecular Mass

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Question

Find mass of Cu having same no. of molecules as 142 grams of iron.
Molar Mass of Cu = 63.5 g mol-1
, and Molar Mass of Iron = 56 g mol-1

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Solution

Dear student,

$A c c o r d i n g t o t h e m o l e c o n c e p t : 1 m o l o f F e = 6.022 x 10^{23} m o l e c u l e s = 56 g 1 g = \frac{6.022 x 10^{23}}{56} 142 g = \frac{6.022 x 10^{23}}{56} \times 142 m o l e c u l e s A s i t i s g i v e n i n t h e q u e s t i o n t h a t C u h a s s a m e m o l e c u l e s a s 142 g o f F e h a s . N o w, 6.022 x 10^{23} m o l e c u l e s o f C u = 63.5 g 1 m o l e c u l e o f C u = \frac{63.5}{6.022 x 10^{23}} g \frac{6.022 x 10^{23}}{56} \times 142 m o l e c u l e s = \frac{63.5}{6.022 x 10^{23}} x \frac{6.022 x 10^{23}}{56} \times 142 = 161 g m o f C u$

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