Introduction to Thermodynamics - Two Basic Problems

[decatte]

Homework Statement

1. A kettle holding 1 lt. of water is boiling. Assuming water is evaporating at a constant evaporation rate of 1g/min, determine how long it will take for the kettle to dry out.

2. Another kettle holding 1 lt. of water and 20g of salt is also boiling. Again water evaporates at a rate of 1g/min. This time you are asked to derive a mathematical relationship for how salt concentration in the kettle changes with respect to time.

 

[decatte]

I need Help!

 

[Fredrik]

These are so easy that it's difficult to give you a hint without telling you the complete answer, but here's a try:

1. 1 liter weighs 1 kg.

2. The amount of water in the kettle (actually the weight in grams) after t seconds is 1000-t/60.

 

[physixguru]

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