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If the boiling point of water is 100.d egree. C. and the boiling point of alcohol is 78.5.d egree. C., the liquor (which is a mixture of alcohol and water) is filled in a container and placed in water always at 100.d egree. C., then () A. Alcohol does not boil, water does B. Alcohol boils, water does not C. Both alcohol and water boil D. Neither alcohol nor water boils
When the liquor is placed in a container at 100°C, when the endothermic temperature of the liquor reaches 78.5°C, the continuous endothermic alcohol will boil. When the temperature reaches 100°C, the internal and external temperatures of the liquor are the same, and the liquor can not absorb heat, so the water can not boil.
Therefore, B.
The dried mixture of potassium chlorate and manganese dioxide was a total of 6 g and the mass of the remaining solid in the test tube after the complete reaction was 4.08 g. 1) How many grams of potassium chlorate in the original mixture? How many moles? 2) What are the remaining solids, in grams each? 3) What is the percentage of potassium chlorate in the original mixture? The dried mixture of potassium chlorate and manganese dioxide was a total of 6, and the mass of the remaining solid in the test tube after complete reaction was 4.08 g, 1) How many grams of potassium chlorate in the original mixture? How many moles? 2) What are the remaining solids, in grams each? 3) What is the percentage of potassium chlorate in the original mixture?
KClO3 reacts with manganese dioxide to form KCl and O2
O2 mass 6-4.08=1.92 g
O2 mass 1.92/32=0.06 mol
Amount of potassium chlorate 0.06*2/3=0.04mol
Potassium chlorate 0.04*(39+35.5+16*3)=4.9g
Remaining solids contain manganese dioxide and KCl
Where manganese dioxide mass 6-4.9=1.1 g
KCl mass 4.08-1.1=2.98 g
%4.9/6=0.8167=81.67%
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