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03-15-2008, 08:16 PM
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| Chemistry Question, Need help? A mixture contains sand and KClO3. The sand is not affected by heating, while the KClO3 is decom*posed to KCl and oxygen by heating. A 5.000 g sample, when heated until no further reaction oc*curred, gave off a gas which occupied a volume of 0.9605 liters at 24.2 oC and 768.0 torr pressure. What is the percent, by weight, of sand in the mixture?      |
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03-15-2008, 08:16 PM
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| 2 KClO3 >> 2 KCl + 3 O2 T = 24.2 + 273 =297.2 K p = 768 / 760 =1.01 moles O2 = pV / RT = 1.01 x 0.9505 / 0.0821 x 297.2 =0.03967 the ratio between KClO3 and O2 is 2 : 3 Moles KClO3 = 0.03967 x 2 / 3 =0.02645 Mass KClO3 = 0.02645 mol x 122.553 g/mol =3.242 g % = 3.242 x100 / 5.000 =64.83 |
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