# Chemistry

posted by .

I need help with this problem

A 0.75–L bottle is cleaned, dried, and closed in a room where the air is 22oC and 44% relative humidity (that is, the water vapour in the air is 0.44 of the equilibrium vapour pressure at 22oC). The bottle is brought outside and stored at 0.0oC.

b) Would liquid water condense at 10oC?

I don't get the letter b part. I know how to get the mass of the H20 i am just stuck with letter B

• Chemistry -

vapor pressure H2O @ 22C = 19.8 mm Hg.
vapor pressure H2O @ 0C = 4.6 mm Hg.

How much water is trapped in the bottle at 22C (295K)?
19.8mm x 0.44 = 8.71 mm
n = PV/RT = (8.71 x 0.75/760*0.08206*295) = about 0.00035 mols but you should redo it more accurately.

How many mols vapor can there be in the bottle after cooling to 0C?
n = (4.6*0.75/760*0.08206*273) = about 0.0002 mols.
You have more mols than that; therefore, some of it will condense. How much. That will be about
0.00035 - 0.0002 = about 0.00015 and that x molar mass H2O = about 0.003 g (about 3 mg).

• Chemistry -

it is not deal with any delta H vapor? because i saw it changes from liquid to gas and have vapor pressure?

• Chemistry -

and if you use: pv/rt. p must be atm.

## Similar Questions

1. ### College Chemistry

1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point …
2. ### College Chemistry

1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point …
3. ### College Chemistry

1. From data below, calculate the total heat (in J) associated with the conversion of 0.514 mol ethanol gas (C2H6O) at 451°C and 1 atm to liquid ethanol at 25.0°C and 1 atm. (Pay attention to the sign of the heat.) Boiling point …
4. ### Chemistry

A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 20°C and 42% relative humidity (that is, the water vapor in the air is 0.42 of the equilibrium vapor pressure at 20°C). The bottle is brought outside and stored …
5. ### chemistry

A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 24°C and 35% relative humidity (that is, the water vapor in the air is 0.35 of the equilibrium vapor pressure at 24°C). The bottle is brought outside and stored …
6. ### Chemistry

A 0.75–L bottle is cleaned, dried, and closed in a room where the air is 22oC and 44% relative humidity (that is, the water vapour in the air is 0.44 of the equilibrium vapour pressure at 22oC). The bottle is brought outside and …
7. ### Chemistry

A 0.75 L bottle is cleaned, dried, and closed in a room where the air is 22°C and 47% relative humidity (that is, the water vapor in the air is 0.47 of the equilibrium vapor pressure at 22°C). The bottle is brought outside and stored …
8. ### Chemistry HELP

A 0.75–L bottle is cleaned, dried, and closed in a room where the air is 22oC and 44% relative humidity (that is, the water vapour in the air is 0.44 of the equilibrium vapour pressure at 22oC). The bottle is brought outside and …
9. ### Chemistry

The relative humidity of air is equal to the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature. If the relative humidity of the air is 30.% and its temperature is 23°C, …
10. ### Physics

A concert hall of volume 2000 m3 contains air at a temperature of 25 ◦C and relative humidity 80 %. Given that the density of water vapour in saturated air at 25 ◦C is 22.8 g/m3 and that the temperature and pressure of …

More Similar Questions