Methanol, CH3OH, is sometimes used as an antifreeze for the water in automobile windshield washer fluids. How many grams of methanol must be added to 5.08 kg of water to lower its freezing point to -15.0°C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86°C.
2007-11-21 18:20:31 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
1310 grams.
2007-11-21 18:29:48 · answer #1 · answered by Doxycycline 6 · 0⤊ 0⤋
Well, the answer is staring you directly in the face (although you have a little work to do to get the result).
Here are the two questions you need to answer in order to solve this problem:
1. How many moles of solute do you need to lower the freezing point of 5.08 kg of water by 15 degrees C (as the normal freezing point of water is 0 degrees C)?
2. What is the molar weight of methanol?
If you multiply the result from question 1 by the result from question 2, you will have your overall answer.
Don't forget to round your answer to the correct number of significant figures.
2007-11-21 18:34:38 · answer #2 · answered by Libertarian T 2 · 0⤊ 0⤋