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Express the composition of each of the following compounds as the mass percents of its elements.
a. formaldehyde, CH2O

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Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.347% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin.

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Anabolic steroids are performance enhancement drugs whose use has been banned from most major sporting activities. One anabolic steroid is fluoxymesterone (C20H29FO3). Calculate the percent composition by mass of fluoxymesterone.

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

f. What is the mass in grams of one molecule of dimethylnitrosamine?

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

e. What is the mass of 1.0 x 10 6 molecules of dimethylnitrosamine?

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

d. How many atoms of hydrogen are in 1.0 mol dimethylnitrosamine?

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

c. What is the mass of 0.050 mol dimethylnitrosamine?

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

b. How many moles of (CH3)2N2O molecules are present in 250 mg dimethylnitrosamine?

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Dimethylnitrosamine, (CH3)2N2O, is a carcinogenic (cancer-causing) substance that may be formed in foods, beverages, or gastric juices from the reaction of nitrite ion (used as a food preservative) with other substances.

a. What is the molar mass of dimethylnitrosamine?

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Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

f. What is the mass of exactly 500 molecules of chloral hydrate?

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Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

d. What number of chlorine atoms are in 5.0 g chloral hydrate?

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Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

c. What is the mass in grams of 2.0 x 10 –2 mol chloral hydrate?

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Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

b. What amount (moles) of C2H3Cl3O2 molecules are in 500.0 g chloral hydrate?

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Chloral hydrate (C2H3Cl3O2) is a drug formerly used as a sedative and hypnotic. It is the compound used to make “Mickey Finns” in detective stories.

a. Calculate the molar mass of chloral hydrate.

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What number of atoms of nitrogen are present in 5.00 g of each of the following?
d. dinitrogen tetroxide

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What number of atoms of nitrogen are present in 5.00 g of each of the following?

c. calcium nitrate

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What number of atoms of nitrogen are present in 5.00 g of each of the following?

b. magnesium nitride

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What number of atoms of nitrogen are present in 5.00 g of each of the following?
a. glycine, C2H5O2N

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What amount (moles) is represented by each of these samples?

c. 1.50 g of dry ice, CO 2

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What amount (moles) is represented by each of these samples?

b. 2.72 x 10 21 molecules of ethanol, C2H5OH

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What amount (moles) is represented by each of these samples?
a. 20.0 mg caffeine, C8H10N4O2

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The molecular formula of acetylsalicylic acid (aspirin), one of the most commonly used pain relievers, is C9H8O4

b. A typical aspirin tablet contains 500. mg of C 9H8O4. What amount (moles) of C9H8O4 molecules and what number of molecules of acetylsalicylic acid are in a 500.-mg tablet?

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The molecular formula of acetylsalicylic acid (aspirin), one of the most commonly used pain relievers, is C9H8O4

a. Calculate the molar mass of aspirin.

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Bauxite, the principal ore used in the production of aluminum, has a molecular formula of Al2O3 • 2H2O. The • H2O in the formula are called waters of hydration. Each formula unit of the compound contains two water molecules.

d. What is the mass of 2.1 x 10 24 formula units of bauxite?

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Bauxite, the principal ore used in the production of aluminum, has a molecular formula of Al2O3 • 2H2O. The • H2O in the formula are called waters of hydration. Each formula unit of the compound contains two water molecules.

c. How many atoms of aluminum are in 0.58 mole of bauxite?

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