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dimulka [17.4K]
3 years ago
15

In a problem, you are given two pressures and one temperature at constant volume and amount of gas. You are asked to find a seco

nd temperature. What law should you use?
Chemistry
2 answers:
Andrew [12]3 years ago
8 0

Answer:

Gay-Lussac's Law.  

Step-by-step explanation:

The volume and number of moles are constant, so we can use <em>Gay-Lussac’s Law</em>:

At constant volume, the pressure exerted by a gas is directly proportional to its temperature.

p₁/T₁ = p₂/T₂     Invert each side of the equation

T₁/p₁ = T₂/p₂     Multiply each side by p₂

  T₂ = T₁ × p₁/p₂

  p₂ = p₁ × T₂/T₁

The units for the pressures don't matter if you use <em>same units for each pressure</em>.

However, the temperatures must be <em>absolute values</em>, usually measured in kelvins.

laiz [17]3 years ago
3 0

I don't know who it was named for but the law is

P1/T1 = P2/T2

Make sure the pressure units are the same (atmospheres or kPa usually) and that the temperature is in Degrees Kelvin which is derived from Celsius degrees.

Try Charles' Law for the name.

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From the given equation we can see that:

every 2 moles of KClO3 gives 3 moles of O2

when mass = moles * molar mass

∴ the mass of KClO3 = (2mol of KClO3*122.6g/mol) = 245.2 g

and the mass of O2 then = 3 mol * 32g/mol = 96 g

so, 245.2 g of KClO3 gives 96 g of O2

A) 2.72 g of KClO3: 

when 245.2 KClO3 gives → 96 g  O2

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X = 2.72 g KClO3 * 96 g O2/245.2 KClO3

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B) 0.361 g KClO3:

when 245.2 g KClO3 gives → 96 g O2

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