January 21, 2017

Homework Help: Chemistry

Posted by Melissa on Saturday, October 23, 2010 at 10:00am.

I am doing a lab online and have no clue on how to get started with the following questions? Please Help me!

1. Calculate and record the following (in grams):

(a) mass of NaCl by subtraction of other components:

(b) measured mass of NaCl after boiling away water:

2. Calculate the percent difference between the results from the two methods from the following equation:

% difference = |(measured mass) - (mass by subtraction)| / (mass by subtraction) * 100%

3. Based on your experimental results, which is the preferred method of separation?

4. What is the mass percent of each component in your mixture? To determine the mass percent, divide the mass of the component by the mass of the total 10g sample and multiply that result by 100.

(a) % NH©þCl =

(b) % SiO©ü =

(c) % NaCl =

52.26g for a and 50.040 for b in question one and not sure if it's right??

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