CBSE Class 11-science Answered
how many atoms of each type are present in 143 grams of washing soda
Asked by vinayakasai | 15 Jun, 2011, 10:59: PM
Expert Answer
Gram molecular mass of Na2CO3 = 106 g
so 106g of Na2CO3 = 1mol
143g of Na2CO3 = 143 / 106 = 1.35 mol
Now, 1 mol of Na2CO3 contains = 2 x 6.022 x 1023 atoms of sodium
so 1.35 mol of Na2CO3 contains = 1.35 x 2 x 6.022 x 1023
= 16.25 x 1023 Na atoms
1 mol of Na2CO3 contains = 6.022 x 1023 atoms of carbon
1.35 mol would have = 1.35 x 6.022 x 1023
= 8.13 x 1023 carbon atoms
1 mol of Na2CO3 contains = 3 x 6.022 x 1023 atoms of oxygen
1.35 mol would have = 1.35 x 3 x 6.022 x 1023
= 24.39 x 1023 oxygen atoms
Answered by | 17 Jun, 2011, 05:44: PM
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