For each of the following, state whether the follow errors made in the procedure
ID: 486183 • Letter: F
Question
For each of the following, state whether the follow errors made in the procedure would make the calculated molar mass larger, smaller or unchanged. (Since molar mass is , if the mass is too large or the moles is too small, the molar mass will be too large.)
A. When the unknown liquid is added to the Erlenmeyer flask, a drop of water (which isn’t very volatile) falls unnoticed into the flask.
B. The flask is heated so long that a lot of the unknown vapor escapes from the flask.
C. The top of the flask is considerably above the water level in the water bath (i.e., the gas in the top of the flask is cooler than the water bath temperature).
Explanation / Answer
A. When the unknown liquid is added to the Erlenmeyer flask, a drop of water falls unnoticed into the flask then solution molarity is less means number of moles will be less and this will leads to a larger molar mass .
B. The flask is heated so long that a lot of the unknown vapor escapes from the flask. It will lead to a more concentrated solution and therefore moles of compound will be more and molar mass will be less.
C. The top of the flask is considerably above the water level in the water bath (i.e., the gas in the top of the flask is cooler than the water bath temperature). there will be no effect of it on molar mass therefore molar mass will be unchanged.
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