Question
Asked Dec 5, 2019
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what would be the density of air under 20 C and 720 mmhg? (Hint: has density is proportional to T)

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Expert Answer

Step 1

Given,

Temperature = 200C = 20+273 = 293K.

Pressure = 720mmHg.

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1mmHg=133.32 Pa 133.32 Pa Pressure =720mmHg × 1mmHg =95990.4 Pa

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Step 2

The mass and volume of air ...

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kg Density = m V=lm³ R=8.314 J/mol K PV=nRT PV RT 95990.4×1 8.314x293 = 39.4 mol molar mass of air=28.97g/mol massof air=moles×molar mass =39.4x28.97 =1141.4 kg

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