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    				| 1. | 
                                    At 20degree celcius the vapour pressure of pure water is 17.5torr,how many mol of water molecules are present per litre of air at this temperature, when relative humidity is 45%? | 
                            
| Answer» At 20degree celcius the vapour pressure of pure water is 17.5torr,how many mol of water molecules are present per litre of air at this temperature, when relative humidity is 45%? | |