Friday

December 19, 2014

December 19, 2014

Posted by **Sandy** on Friday, March 28, 2014 at 1:42pm.

1) The whole experiment involves using the ideal gas law to predict the molar mass of an unknown liquid. The formula is molar mass of liquid = gR(0.0821)T(temperature in Kelvins) divided by Pressure(atm) multiplied by Volume (liters).

A student did not dry the erlenmeyer flask before weighing it. As a result of this error, would the molar mass be higher or lower than the correct value?

I said that the molar mass would be higher due to there is a greater difference in when one has to subtract the mass of the flask from the mass of the flask with the condensed liquid, there would be a greater difference and the mass of the substance would be calculated to be higher.

2) A student added 0.1mL of unknown liquid rather than 6mL to a 125mL flask. What effect would this action have on the calculated molar mass?

I said that there would be no difference because the volume of the flask is what the volume of the gas will be equal to.

- Chemistry -
**DrBob222**, Friday, March 28, 2014 at 2:29pmI don't know exactly how the experiment was conducted but I think 1 is right. For 2, however, I think the results must be either too high or too low (but see the note below). If too little liquid is placed in the flask that means that vapor cannot fill the flask so your second weighing weighs all of the vapor produced and some air also. That means the mass of the vapor is too small which will lead to low results. Note: That answer assumes that 0.1 mL doesn't provide enough sample to fill the flask with vapor. If it did the result would not be changed.

**Answer this Question**

**Related Questions**

Algebra - |3x+8|=20; -4 Basically that 4 is asking whether that is a possible ...

MATH - i need to write each expression as a product of the same factor: * = ...

math exponents - i need to write each expression as a product of the same factor...

Math - I would just like someone to check my work and make sure I am doing it ...

Latin - I have to translate the following sentence into English: Familia nostra ...

Chemistry - I posted a question like this but my numbers were actually wrong. ...

algebra - I just need a quick check before I hand in my work if you would......

CHEM** - I just have 2 other questions that I just want to make sure on: Place ...

calc - Find the derivatives of the following functions using the differentiation...

Math - please elaborate - can someone please further explain my question on? it'...