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Catgirl7060
26.06.2019 •
Chemistry
Which of the following gases has the highest average molecular velocity at 25 °c? h2o he hcl brf no2
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Ответ:
He
Step-by-step explanation:
A postulate of the Kinetic Molecular Theory is that at a given temperature, the average kinetic energy of the molecules is directly proportional to the Kelvin temperature.
KE = ½ mv² ∝ T
mv² ∝ T Divide each side by T
v² ∝ T/m
If T is constant.
v² ∝ 1/m Take the square root of each side
v ∝ 1/√m
This is an inverse relationship, so the molecules with the smallest molecular mass should have the highest average speeds.
A helium molecule has the smallest mass, so helium has the highest average molecular velocity.
Ответ:
water can dissolve ionic and polar molecules.