A 200.0-g sample of a pure substance was composed of 131.9 g of copper and 68.1 g of sulfur. Another sample of the same substance, this time with a mass of 150.0 g, was brought to Joseph Proust to analyze. How many grams of copper and sulfur would you expect to find in the sample?

 

 

What basic law in chemistry are you employing in order to make your determination?

a.Law of Multiple Proportions

b.Law of Combining Volumes

c.Law of Conservation of Mass

d.Law of Definite Composition

This sounds like homework

 

At any rate, the 200g sample and the 150g sample are the same material, so the ratio of the elements that make it up will be the same. For example, 18.02g of water will have 2.02g of hydrogen and 16.00g of oxygen. 36.04g of water (twice as much) will have 4.04g of hydrogen (2x) and 32.00g of oxygen (also 2x). This is because all water is composed of certain elements in definite ratios.

 

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are you one of my students? I taught them this just yesterday. Moved to homework help

 

A 200.0-g sample of a pure substance was composed of 131.9 g of copper and 68.1 g of sulfur. Another sample of the same substance, this time with a mass of 150.0 g, was brought to Joseph Proust to analyze. How many grams of copper and sulfur would you expect to find in the sample?

 

 

What basic law in chemistry are you employing in order to make your determination?

a.Law of Multiple Proportions

b.Law of Combining Volumes

c.Law of Conservation of Mass

d.Law of Definite Composition