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The drain cleaner Drainex contains small...

The drain cleaner Drainex contains small bits of aluminium which react with caustic soda to produce hydrogen What volume of hydrogen at `20^(@)C` aand one bar will be released when `0.15 g` of aluminium reacts ? .

Text Solution

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The chemical reaction taking place is
`underset(2xx27 g)underset(2 mol)(2AI)+2NaOH+2H_(2)O rarr 2NaAIO_(2)+underset(3mol)(3H_(2)`
`54 g` of `Al` produces hydrogen `=3 mol`
`0.15 g` of `Al` produces hydrogen
`=(3xx0.15)/(54) mol=8.33xx10^(-3)mol`
Calculation of volume of `8.33xx10^(-3)mol` of hydrogen at `20^(@)C` and `1` bar:
`V=(nRT)/(P)`
`=(8.33xx10^(-3)(mol)xx0.083("bar" L K^(-1) mol^(-1))xx293 (K))/(1 "bar")`
`=0.20282 L=202.82 mL`
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CENGAGE CHEMISTRY ENGLISH-STATES OF MATTER-Exercises (Ture False)
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  2. In the van der Waals equation (P + (n^(2)a)/(V^(2)))(V - nb) = nRT ...

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  3. Kinetic energy of a molecule is zero at 0^(@)C

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  6. Real gases show deviation from ideal behavior at low temperature and h...

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  7. All the molecules in a given sample of gas move with same speed.

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  8. Small value of a means, gas can be easily liqueifed.

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  9. Small value of a means, gas can be easily liqueifed.

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  10. Rate of diffusion is directly proportional to the square root of molec...

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  11. For ideal gases, Z = 1 at all temperature and pressure.

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  12. According to charles's law,

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  13. The pressure of moist gas is higher than pressure of dry gas.

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  14. Gases do not occupy volume and do not have force of attraction.

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  15. The van der Waal equation of gas is (P + (n^(2)a)/(V^(2))) (V - nb)...

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  16. Surface tension and surface energy have different dimensions.

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  17. The plot of PV vs P at particular temperature is called isovbar.

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  18. Give reasons for the following in one or two sentences. (a) A bottle...

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  19. Can a gas with a = 0 be liquefied?

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  20. The van der waals constants have same values for all the gases.

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  21. All the molecules in a given sample of gas move with same speed.

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