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April 20, 2014

Homework Help: Chemistry

Posted by Amy on Monday, September 10, 2012 at 9:36pm.

1.) A convenient method of determining the volume of a container of irregular shape is to fill it with a liquid of known density and measure the mass. An empty Erlenmeyer flask marked "10 mL" weighs 26.3251 g. When filled with mercury, with density = 13.5340 g/mL (at 25.0 C), it weighs 176.2510 g.

a.) Calculate the true volume of the flask.

b.) The flask is considered "empty," but it in fact contains air, which has a density = 0.0012250 g/mL. When it contains a gas at 100.0 C, its mass is 26.3415 g. Calculate the molar mass of the gas.

c.) Elemental analysis of the gas shows that it is composed of 85.63 % C, 14.37 % H, and no other elements. What is the molecular formula of the gas?

I'm stuck on a.) and I can't continue to the next part. Any help is appreciated!

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