Calculate no of atoms in 490g of KCIO3
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Answer:
2KClO
3
+heat→2KCl+3O
2
2mol KClO
3
produce 3 mol O
2
The 0.384 g mass loss was due to the oxygen generated.
The amount of moles of oxygen generated can be calculated as: Molar mass O
2
= 32 g/mol
0.384 g O
2
= 0.384/32 = 0.012 mol O
2
generated
This came from the decomposition of 0.012 x 2/3 = 0.008 mol ofKClO
3
Molar mass KClO
3
= 122.55 g/mol
0.008 mol KClO
3
= 0.008 x 122.55 = 0.9804 g KClO
3
decomposed
% of original sample=
4.90
0.9804
×100=20%
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