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ICSE Class 10 Chemistry 2017 Paper

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Question : 31 of 86
Marks: +1, -0
Calculate the number of gram atoms in 4.6 grams of sodium (Na=23)(\mathrm{Na}=23) .
Solution:  
23 gm23\ \mathrm{gm} of Na=1 gm\mathrm{Na}=1\ \mathrm{gm} atom
4.6 gm   of   Na  =  123×4.64.6\ \mathrm{gm}\;\text{ of }\;\mathrm{Na}\;=\;\frac{1}{23}\times 4.6
  =0.2 gm   atom   \;=0.2\ \mathrm{gm}\;\text{ atom }\;
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