# physics

1500 cm3 of ideal gas at STP is cooled to -20°C and put into a 1000 cm3 container. What is the final gauge pressure?

11 kPa

40 kPa

113 kPa

141 kPa

240 kPa

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1. absolute pressure=101.3kpa(273-20)/273*1500/1000

Gauge pressure=absolute-atmospheric.
determine

So just estiamting, answer b is in the ballpark.

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posted by bobpursley
2. a liter is 10^3 = 1000 cm^3

so we have 22.4 * 1.5 = 33.6 moles of gas at 273 deg K and 100 kPa

P V = n R T
n and r remain the same
so
P1V1/T1 = P2V2/T2

100 (1500)/273 = P2 (1000)/253

P2 = 139 kPa ABSOLUTE pressure
- 100 KPa for gage
= 39 k Pa gage

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posted by Damon

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