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.

Chemistry - bobpursley, Wednesday, February 17, 2010 at 9:11am
2) YOur balanced equation gives the answer: 1 mole of calcium carbonate yields one mole of carbon dioxide, which is 12 grams carbon. So for .55grams, you must have had .55/12 moles of calcium carbonate.

3. knowing the moles of calcium carbonate, change it to mass (grams).
Chemistry - Anonymous, Wednesday, April 21, 2010 at 2:50pm
What is the molarity of a solution containing 8 grams of solute in 500 mL of solution? Round to the nearest hundredth. Don't forget the units! (gram formula mass of solute = 24 g)

Answer this Question

Related Questions

science - if i had mixture of sodium carbonate and sand, and spilled some sodium...
Science- 8th grade - What type of sand/rock is Malibu Beach made of and where ...
chemistry - A 0.2528 g sample of a mixture containing sodium carbonate and sand ...
please help idin't get it - 5.imagine you are at the beach on a very hot ...
Physics - The U.S army's parachuting team, the Golden Knights, are on a ...
science - 5.imagine you are at the beach on a very hot day. you walk toward the ...
science - 5.imagine you are at the beach on a very hot day. you walk toward the...
Physical Science - Pour vinegar onto beach sand in the Carribian and the results...
Math- college - A company has to ship 1148 kg of sand,if one bag can hold 13kb ...
Chemistry - Why does sand tends to get hotter than water? I'm sure this isn...

For Further Reading

First Name:
School Subject:
Answer: