Calculate the mass (in g) of each sample.

a. 4.5 x 10^{25} O_{3} molecules.

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Phosphorus is obtained primarily from ores containing calcium phosphate. If a particular ore contains 57.8% calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus?

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A particular brand of beef jerky contains 0.0552% sodium nitrite by mass and is sold in an 8.00-oz bag. What mass of sodium does the sodium nitrite contribute to sodium content of the bag of beef jerky?

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How many molecules are in each sample?

d. 19.3 g C_{8}H_{10}

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Write the structural formulas of three different compounds that each have the molecular formula C_{5}H_{12}.

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How many molecules are in each sample?

c. 22.1 g O_{2}

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How many molecules are in each sample?

b. 389 g CBr_{4}

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How many molecules are in each sample?

a. 6.5 g H_{2}O

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How many moles (of molecules or formula units) are in each sample?

d. 195 kg CaO

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Researchers obtained the following data from experiments to find the molecular formula of benzocaine, a local anesthetic, which contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54 g sample of benzocaine with excess O_{2} formed 8.49 g of CO_{2} and 2.14 g H_{2}O. Another sample of mass 2.35 g was found to contain 0.199 g of N. The molar mass of benzocaine was found to be 165 g/mol. Find the molar formula benzocaine .

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How many moles (of molecules or formula units) are in each sample?

c. 0.1187 g C_{8}H_{18}

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How many moles (of molecules or formula units) are in each sample?

b 23.6 kg Fe(NO_{3})_{2}

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How many moles (of molecules or formula units) are in each sample?

a. 55.98 g CF_{2}Cl_{2}

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Calculate the formula mass for each compound.

d. Ca(NO_{3})_{2}

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Calculate the formula mass for each compound.

c. CBr_{4}

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Calculate the formula mass for each compound.

b. HNO_{2}

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Calculate the formula mass for each compound.

a. MgBr_{2}

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Write formulas for each acid.

a. phosphoric acid

b. hydrocyanic acid

c. chlorous acid

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Write formulas for each acid.

a. hydrofluoric acid

b. hydrobromic acid

c. sulfurous acid

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Name each acid.

c. H_{2}SO_{4}

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Name each acid.

b. HClO_{2}

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Name each acid.

a. HCl

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Name each acid.

c. H_{2}CO_{3}

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Name each acid.

b. HNO_{3}

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Estrone, which contains only carbon, hydrogen, and oxygen, is a female sexual hormone that occurs in the urine of pregnant women. Combustion analysis of a 1.893 g sample of estrone produces 5.545 g of CO_{2} and 1.388 g H_{2}O. The molar mass of estrone is 270.36 g/mol. Find the molecular formula for estrone.

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