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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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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.

b. What is the mass of aluminum in 0.58 mole 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.

a. What is the molar mass of bauxite?

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Calculate the molar mass of the following substances.

c. Na 2HPO4

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Calculate the molar mass of the following substances.

b. Ca 3(PO4)2

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Calculate the molar mass of the following substances.

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The Freons are a class of compounds containing carbon, chlorine, and fluorine. While they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere. In 1991, two replacement compounds for Freons went into production: HFC-134a (CH2FCF3) and HCFC-124 (CHClFCF3). Calculate the molar masses of these two compounds.

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A diamond contains 5.0 x 10 21 atoms of carbon. What amount (moles) of carbon and what mass (grams) of carbon are in this diamond?

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Diamond is a natural form of pure carbon. What number of atoms of carbon are in a 1.00-carat diamond (1.00 carat = 0.200 g)?

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What number of Fe atoms and what amount (moles) of Fe atoms are in 500.0 g of iron?

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Calculate the mass of 500. atoms of iron (Fe).

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The element europium exists in nature as two isotopes:  151Eu has a mass of 150.9196 amu, and 153Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative abundance of the two europium isotopes.

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Assume silicon has three major isotopes in nature as shown in the table below. Fill in the missing information.

Isotope                            Mass (amu)                   Abundance
28Si                                     27.98                           ——––—
29Si                                   ——––—                          4.70%
32Si                                     29.97                              3.09%

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The element rhenium (Re) has two naturally occurring isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu. Calculate the mass of 185Re.

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An element consists of 1.40% of an isotope with mass 203.973 amu, 24.10% of an isotope with mass 205.9745 amu, 22.10% of an isotope with mass 206.9759 amu, and 52.40% of an isotope with mass 207.9766 amu. Calculate the average atomic mass and identify the element.

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In a reaction, 34.0 g of chromium(III) oxide reacts with 12.1 g of aluminum to produce chromium and aluminum oxide. If 23.3 g
of chromium is produced, what mass of aluminum oxide is produced?

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Identify each of the following elements:

c. a noble gas with 18 protons in the nucleus

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Identify each of the following elements:

b. a member of the alkali metal family whose most stable ion contains 36 electrons

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Identify each of the following elements:

a. a member of the same family as oxygen whose most stable ion contains 54 electrons

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

j. H2S, sulfuric acid

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

i. HNO3, nitrate acid

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

h. Na2O2, sodium oxide

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

g. P2S5, phosphorous sulfide

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

f. Mg(C2H3O2)2 manganese diacetate

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Each of the following compounds is incorrectly named. What is wrong with each name, and what is the correct name for each compound?

d. Al2S3, dialuminum trisulfide

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