What is the density of wet air with 40% relative humidity at 1 atm and 284.5 K. [Given vapour pressure of `H_(2)O=47.5` torr, Average molar mass of dr

Question

What is the density of wet air with 40% relative humidity at 1 atm and 284.5 K. [Given vapour pressure of `H_(2)O=47.5` torr, Average molar mass of dr

What is the density of wet air with 40% relative humidity at 1 atm and 284.5 K. [Given vapour pressure of `H_(2)O=47.5` torr, Average molar mass of dry air = 29 g `mol^(-1)`]
A. 1.15 g/L
B. 1.23 g/L
C. 1.35 g/L
D. 1.4 g/L

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
`40=(P_(H_(2)O))/(47.5)xx100,P_(H_(2)O)=19" torr"`
`%" of "H_(2)O" in air"=(19)/(760)xx100=2.5`
`M_(av)=(97.5xx29xx2.5xx5xx18)/(100)=28.73`,
`d=(PM)/(RT)=(1xx28.73)/(0.0821xx284.5)=1.23g//L`

4 views Answered 2023-02-05 15:29