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chemistry sample problems, final tomorrow?

chemistry sample problems, final tomorrow? - Chemistry Forum

chemistry sample problems, final tomorrow? - Chemistry Forum. Discuss chemical reactions, chemistry.


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Old 06-18-2009, 10:16 PM
Pipette Filler
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Default chemistry sample problems, final tomorrow?



can someone help me with these chemistry problems?
i have a final tomorrow and i just need someone to work through the steps to solve each one.. thank you sooo much..

1. How much energy is needed to vaporize 250 grams of water at its boiling point?

2. If I add 45 grams of sodim chloride to 500 grams of water, what will the melting and boiling points be of the resulting solution? Kb = .52 degreesC/m and Kf(h20) = 1.86 degrees C/m

3. What mass of octane C8H18 is required to fill a 1.4 dm3 airbag with CO2 if the wrecker truck burns octane at STP?
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