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For the law of conservation of matter to be obeyed, how much sulfur is unused?

Submitted by glamxdiva on Thu, 09/27/2012 - 17:05

Suppose 12.0 {\rm g} of carbon ({\rm C}) reacts with 73.0gof sulfur ({\rm S}) to give 76.0 {\rm g} of the compound carbon disulfide ({\rm CS}_{2}). In the process, all the carbon gets used up, but some elemental sulfur is left over.

For the law of conservation of matter to be obeyed, how much sulfur is unused?

What is the percent {\rm C} in {\rm CS}_{2}?

What is the percent {\rm S} in {\rm CS}_{2}?

What is the sum of the %{\rm C} and %{\rm S} in {\rm CS}_{2}?

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2. A 34.01-{\rm g} sample of pure hydrogen peroxide produced at a chemical company contains 32.00 {\rm g}of oxygen. The rest of the mass is due to hydrogen.

What is the percent by mass of hydrogen in this sample?

What is the percent by mass of oxygen in this sample?

101.62-{\rm g} sample of pure hydrogen peroxide is obtained. How many grams of it are oxygen?


If 12g C reacts with excess sulphur and makes 76g of CS2, then 64g of S are used and 73-64 g of S are left.

%C in CS2 = (12/76) x 100