2. Atoms & Elements

Law of Definite Proportions

2. Atoms & Elements

Law of Definite Proportions

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Law of Definite Proportions

Law of Definite Proportions Example 1

Law of Definite Proportions Example 2

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Multiple Choice

The formula for sodium hydroxide is NaOH. A sample of NaOH weighing 18.1124 is found to be comprised of 10.41 g Na and .456 g H. Determine the grams of oxygen most likely to be found in a sample that weighs 25.360 g.

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Textbook Question

A 1.0-g sample of carbon dioxide (CO2) is fully decomposed into its elements, yielding 0.273 g of carbon and 0.727 g of oxygen. (a) What is the ratio of the mass of O to C?

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Textbook Question

A chemist finds that 30.82 g of nitrogen will react with 17.60, 35.20, 70.40, or 88.00 g of oxygen to form four different compounds. (a) Calculate the mass of oxygen per gram of nitrogen in each compound. 30.82 g N and 17.60 g O

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Textbook Question

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Textbook Question

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Textbook Question

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Textbook Question

Determine the number of each type of atom in each formula. c. Al(NO3)3

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Textbook Question

Determine the number of each type of atom in each formula. b. CuSO4

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Textbook Question

Determine the number of each type of atom in each formula. a. Ca(NO2)2

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Textbook Question

Two samples of carbon tetrachloride are decomposed into their constituent elements. One sample produces 38.9 g of carbon and 448 g of chlorine, and the other sample produces 14.8 g of carbon and 134 g of chlorine. Are these results consistent with the law of definite proportions? Explain your answer.

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Textbook Question

The mass ratio of sodium to fluorine in sodium fluoride is 1.21:1. A sample of sodium fluoride produces 28.8 g of sodium upon decomposition. How much fluorine (in grams) forms?

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Textbook Question

Upon decomposition, one sample of magnesium fluoride produces 1.65 kg of magnesium and 2.57 kg of fluorine. A second sample produces 1.32 kg of magnesium. How much fluorine (in grams) does the second sample produce?

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Textbook Question

How many hydrogen atoms are in each of the following: (b) Ca1C2H5COO22?

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Textbook Question

How many of the indicated atoms are represented by each chemical formula: (b) oxygen atoms in Ca1ClO322

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Textbook Question

How many of the indicated atoms are represented by each chemical formula: (a) carbon atoms in C4H9COOCH3

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Textbook Question

A sample of ascorbic acid (vitamin C) is synthesized in the laboratory. It contains 1.50 g of carbon and 2.00 g of oxygen. Another sample of ascorbic acid isolated from citrus fruits contains 6.35 g of carbon. According to the law of constant composition, how many grams of oxygen does it contain?

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Textbook Question

Write a ratio showing the relationship between the molar amounts of each element for each compound. (See Appendix IIA for color codes.) (a)

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Textbook Question

A 7.83 g sample of HCN contains 0.290 g of H and 4.06 g of N. Find the mass of carbon in a sample of HCN with a mass of 3.37 g.

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Textbook Question

The chloride of an unknown metal is believed to have the formula MCl3. A 2.395-g sample of the compound contains 3.606 * 10 - 2 mol Cl. Find the atomic mass of M.

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Open Question

What does the chemical formula C₃H₆O₂ tell about a molecule of the compound it represents?

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Open Question

"Na₂SO₃' represents sodium sulfite. what does the 4 mean in the formula 4 Na₂SO₃?

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