Definite Proportions

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The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

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Definite proportions

Front

Which statement is the Law of Definite Proportions?

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 A given chemical compound always contains its component elements in fixed ratio (by mass).

Front

In accordance with the law of definite proportions, if a sample of CO₂ is 27.29% C by mass, then what is the mass of carbon in a 150. gram sample of CO₂?

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40.94 g

Front

How many grams of nitrogen are there in a 25.6 g sample of ammonia (NH₃) if ammonia is always 82.25% N by mass?

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21.06 g

Front

If the mass for a oxygen is 16.00 amu (mass provided on the periodic table) and water (H₂O) is 88.79% oxygen by mass, then what is the mass of a water molecule in amu?

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18.02 amu

Front

According to the law of definite proportions, how many grams of Cl are there in a 134 g sample of HCl (g) if a 5.00 g sample contains 4.862 g of Cl?

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130.3 g

Front

The law of definite proportions is also known as the law of constant composition because ...

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a compound is always the same (or constant) percent composition of each element by mass.