Friday
March 6, 2015

Homework Help: Chemistry

Posted by Tony on Wednesday, February 17, 2010 at 1:04am.

In an experiment to find the percentage of calcium carbonate in sand from a beach, 1.86 g of sand reacted with an excess of dilute hydrochloric acid to give 0.55 g of carbon dioxide.
CaCO3 (s) + 2HCL (aq) CaCl2(aq) + CO2(g) + H2O (l)

1.Calculate the number of moles of carbon present in 0.55 g of CO2


2.How many moles of calcium carbonate must have been present in the sand to produce this amount of carbon dioxide?

3. Calculate the mass of calcium carbonate present in the sand.

4. Calculate the percentage of calcium carbonate present in the sand.


Note to reader:
the questions i really find difficult is 2 and 3.

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