Homework Help: Chemistry

Posted by Shadow on Sunday, February 3, 2013 at 4:43pm.

I did a lab that involve cooking meat and finding the mass of lipids, meat tissue and water.

For a chicken sample the original mass was 20 gram. After cooking there was 15.5g of meat, and 1.5 g of oil, and 1 g of water. I am missing 2 g of the original mass. Anyone have any idea what is the missing variable here? Thanks

Chemistry - DrBob222, Sunday, February 3, 2013 at 4:53pm
I assume cooking was at T of 300 or so (over boiling point of H2O). Could some of the water have evaporated, either during cooking or during cooling outside the oven.
Chemistry - Shadow, Sunday, February 3, 2013 at 5:06pm
DrBob, let say the mass of H2O is 18 g. Would 1 gram of water be about 0.05 mole of H2O? Thanks
Chemistry - DrBob222, Sunday, February 3, 2013 at 5:14pm
Yes, 1 g H2O = 1/18 = 0.556 mol.

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