Problem 1SAQ: Q1. How many atoms are there in 5.8 mol helium?
a. 23.2 atoms
b. atoms
c. atoms
d. atoms
Problem 2SAQ: A sample of pure silver has a mass of 155g How many moles of silver are in the sample? a. 1.44 mol... Problem 3SAQ: How many carbon atoms are there in a 12.5kg sample carbon? 6.271020 atoms 9.041028 atoms 6.271026... Problem 4SAQ: Q4. Which sample contains the greatest number of atoms?
a.
b.
c.
d. None of the above (all... Problem 5SAQ: Q5. What is the average mass (in grams) of a single carbon dioxide molecule?
a.
b.
c.
d.
Problem 6SAQ: Q6. How many moles of O are in 1.6 mol of?
1.6 mol O
3.2 mol O
4.8 mol O
9.6 mol O
Problem 7SAQ: Q7. How many grams of Cl are in?
Problem 8SAQ: Q8. Which sample contains the greatest number of F atoms?
Problem 9SAQ: Q9. The compound is 35.8% A by mass. What mass of the compound contains 55.1g A?
a.
b.
c.
d.
Problem 10SAQ: Q10. Which compound has the highest mass percent C?
a.
b.
c.
d.
Problem 11SAQ: What is the mass percent N in C2H8N2 ? a. 23.3% N b. 16.6% N c. 215% N d. 46.6% N Problem 12SAQ: Q12. A compound is 52.14% C, 13.13% H, and 34.73% O by mass. What is the empirical formula of the... Problem 13SAQ: A compound has the empirical formula CH2O and a formula mass of 120.10 amu. What is the molecular... Problem 14SAQ Problem 1E: Why is chemical composition important? Problem 2E: 2. How can you efficiently determine the number of atoms in a sample of element? Why is counting... Problem 3E: How many atoms are in 1 mol of atoms? Problem 4E: 4. How many molecules are in 1 mol of molecules?
Problem 5E: 5. What is the mass of 1 mol of atoms for an element?
Problem 6E: What is the mass of 1 mol of molecules for a compound? Problem 7E: What is the mass of 1 mol atoms of each element? a. P b. Pt c. C d. Cr Problem 8E: 8. What is the mass of 1 mol of molecules of each compound?
a.
b.
C.
d.
Problem 9E: 9. The subscripts in a chemical formula give relationships between moles of the constituent elements... Problem 10E: 10 Write the conversion factors between moles of constituent element and mole of the compound for .
Problem 11E Problem 12E: 12. What is the mathematical formula for calculating mass percent composition from a chemical... Problem 13E: How are the empirical formula and the molecular formula of a compound related? Problem 14E: 14. Why is it important to be able to calculate an empirical formula from experimental data?
Problem 15E: 15. What is the empirical formula mass of a compound?
Problem 16E: 16. How are the molar mass and empirical formula mass for a compound related?
Problem 17E: How many mercury atoms are in 5.8mol of mercury? Problem 18E: 18. How many moles of gold atoms do gold atoms constitute?
Problem 19E: How many atoms are in each elemental sample? a. 3.4molCu b. 9.710-3molC c. 22.9molHg d. 0.215molNa Problem 20E: 20. How many moles of atoms are in each elemental sample?
a.
b.
c.
d.
Problem 21E: Complete the table. Element Moles Number of Atoms Ne 0.552 ____ Ar ____ 3.251024 Xe 1.78 ____ He... Problem 22E: 22. Complete the table.
Element Moles Number of Atoms
Cr _____
Fe ______
Ti ______
Hg ______
Problem 23E: Consider these definitions. 1 doz =12 1gross =144 1 ream =500 1 mol = 6.0221023 Suppose you have 872... Problem 24E: 24. A pure copper penny contains approximately copper atoms. Use the definitions in the previous... Problem 25E: 25. How many moles of tin atoms are in a pure tin cup with a mass of 38.1 g?
Problem 26E: 26. A lead fishing weight contains 0.12 mol of lead atoms. What is its mass?
Problem 27E: 27. A pure gold coin contains 0.145 mol of gold. What is its mass?
Problem 28E: 28. A helium balloon contains 0.46 g of helium. How many of helium does it contain?
Problem 29E: How many moles of atoms are in each elemental sample? a. 1.34gZn b. 24.9gAr c. 72.5gTa d. 00.223gLi Problem 30E: 30. What is the mass in grams of each elemental sample?
a. mol W
b. mol Ba
c. mol Xe
d. mol S
Problem 31E: Complete the table. Element Mole Mass Ne ____ 22.5g Ar 0.117 ____ Xe ____ 1.00kg He 1.44104 ____ Problem 32E: Complete the table. Element Moles Mass Cr 0.00442 ____ Fe ____ 73.5mg Ti 1.009103 ____ He ____... Problem 33E: 33. Apure silver ring contains mmol (millmol) Ag. How many silver atoms it contain?
Problem 34E: A pure gold ring contains 0.0102 mmol (millmol) Au. How Many gold atoms dose it contain? Problem 35E: How many aluminum atoms are in 3.78 g of aluminum? Problem 36E: 36. What is the mass of platinum atoms?
Problem 37E: How many atoms are in each elemental sample? a. 16.9 g Sr b. 26.1 g Fe c. 8.55 g Bi d. 38.2 g P Problem 38E: Calculate the mass in grams of each elemental sample. a. 1.321020 uranium atoms b. 2.551022 zinc... Problem 39E: 39. How many carbon atoms are in a diamond (pure carbon) with a mass of 38 mg?
Problem 40E: How many helium atoms are in a helium blimp containing 495 kg of helium? Problem 41E: 41. How many titanium atoms are in a pure titanium bicycle frame with a mass of kg?
Problem 42E: 42. How many copper atoms are in a pure copper statue with a mass of kg?
Problem 43E: 43. Complete the table.
Element Mass Moles Number of... Problem 44E: 44. Complete the table.
Element Mass Moles Number of... Problem 45E: Which sample contains the greatest number of atoms? a. 27.2 g Cr b. 55.1 g Ti c. 205 g Pb Problem 46E: Which sample contains the greatest number of atoms? a. 10.1 g He b. 25.0 g Ne c. 115 g Xe Problem 47E: 47. Determine the number of molecules (or formula units) in each sample.
a. g sodium chloride
b. g... Problem 48E: 48. Determine the mass of each sample.
a. mol carbon tetra fluoride
b. mol magnesium fluoride
c. ... Problem 49E: 49. Complete the table.
Compound Mass Moles Number of... Problem 50E: 50. Complete the table.
Compound Mass Moles Number of... Problem 51E: A mothball, composed of naphthalene (C10H8), has a mass 1.32g. How many naphthalene molecules does... Problem 52E: Calculate the mass in grams of a single water molecule. Problem 53E:
53. How many molecules are in each sample?
a.
b.
c.
d.
Problem 54E:
54. Calculate the mass in grams of each sample.
a. molecules
b. molecules
c. molecules
d. ... Problem 55E: 55. A sugar crystal contains approximately sucrose molecules. What is its mass in milligrams?
Problem 56E: A salt crystal has a mass of 0.12 mg. How many NaCl formula units does it contain? Problem 57E: How much money, in dollars, dose 1 mol of pennies represent? If this amount of money were evenly... Problem 58E: A typical dust particle has a diameter of about 10.0 mm. If 1.0 mol of dust particles were laid end... Problem 59E: 59. Determine the number of moles of in mol .
Problem 60E: 60. How many moles of O are in mol ?
Problem 61E: 61. Which sample contains the greatest number of moles of O?
a. mol
b. mol
c. mol
d. mol
Problem 62E Problem 63E: Determine the number of moles of C in each sample. a. 2.5 mol CH4 b. 0.115 mol C2H6 c. 5.67 mol... Problem 64E: Determine the number of moles of H in each sample. a. 4.67 mol H2O b. 8.39 mol NH3 c. 0.117 mol N2H4... Problem 65E: 65. For each set of molecular models, write a relationship between moles of hydrogen and moles of... Problem 66E: 66. For each set of molecular models, write a relationship between moles of oxygen and moles of... Problem 67E: 67. How many grams of are in 38.0 g of each sample of chlorofluorocarbons ?
a.
b.
c.
d.
Problem 68E: 68. Calculate the number of grams of sodium in 1.00 g of each sodium-containing food additive.
a. ... Problem 69E: Iron is found in Earths crust as several different iron compounds. Calculate the mass (in kg) of... Problem 70E: 70. Lead is found in Earth’s crust as several lead compounds. Calculate the mass (in kg) of each... Problem 71E: A 2.45-g sample of strontium completely reacts with oxygen to form 2.98 g of strontium oxide. Use... Problem 72E: A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67g of aluminum oxide. Use this... Problem 73E: A 1.912g sample of calcium chloride is decomposed into its constituent elements and found to contain... Problem 74E Problem 75E: 75. Copper(II) fluoride contains 37.42% F by mass. Use this percentage to calculate the mass of... Problem 76E: Silver chloride, used in silver plating, contains 75.27% Ag. Calculate the mass of silver chloride... Problem 77E: In small amounts, the fluoride ion (often consumed as NaF) prevents tooth decay. According to the... Problem 78E: The iodide ion, usually consumed as potassium iodide, is dietary mineral essential to good... Problem 79E: 79. Calculate the mass percent composition of nitrogen in each compound.
a.
b.
c.
d.
Problem 80E: Calculate the mass percent composition of carbon in each compound. a. C2H2 b. C3H6 c. C2H6 d. C2H6O Problem 81E: 81. Calculate the mass percent composition of each element in each compound.
a.
b.
c.
d.
Problem 82E: 82. Calculate the mass percent composition of each element in each compound.
a.
b.
c.
d.
Problem 83E: 83. Calculate the mass percent composition of O in each compound.
a. calcium nitrate
b. iron(II)... Problem 84E: Calculate the mass percent composition of Cl in each compound. a. carbon tetrachloride b. calcium... Problem 85E: Various iron ores have different amounts of iron per kilogram of ore. Calculate the mass percent... Problem 86E: 86. Plats need nitrogen to grow, so many fertilizers consist of nitrogen containing compounds.... Problem 87E: 87. A compound containing nitrogen and oxygen is decomposed in the laboratory and produces nitrogen... Problem 88E: 88. A compound containing selenium and fluorine is decomposed in the laboratory and produces of... Problem 89E: 89. Samples of several compounds are decomposed, and the masses of their constituent elements are... Problem 90E: Samples of several compounds are decomposed, and the masses of their constituent elements are... Problem 91E: 91. The rotten smell of a decaying animal carcass is partially due to a nitrogen-containing compound... Problem 92E: 92. Citric acid, the compound responsible for the sour taste lemons, has the elemental composition:... Problem 93E: 93. These compounds are found in many natural favors and scents. Calculate the empirical formula for... Problem 94E: Calculate the empirical formula for each over-the-counter pain reliever a. acetaminophen (Tylenol):... Problem 95E: 95. A sample of phosphorus burns in air and forms of a phosphorus oxide. Calculate the empirical... Problem 96E: A 2.241-g sample of nickel reacts with oxygen to form 2.852-g of the metal oxide. Calculate the... Problem 97E: A sample of nitrogen reacts with chlorine to form of the chloride. What is the empirical formula... Problem 98E: 98. A sample of phosphorus reacts with selenium to form of the selenide. What is the empirical... Problem 99E: 99. A compound containing carbon and hydrgen has a molar mass of and an empirical formula of .... Problem 100E: A compound containing phosphorus and oxygen has a molar of 219.9g/mole and an empirical formula of... Problem 101E: 101. The molar masses and empirical formulas of several compounds containing carbon and chlorine are... Problem 102E: The molar masses and empirical formulas of several compounds containing carbon and nitrogen are... Problem 103E: 103. A. pure copper cube has an edge length of 1.42 cm. How copper atoms dose it contain? Hint:... Problem 104E Problem 105E: A drop of water has a volume of approximately 0.05 mL. How many water molecules does it contain?... Problem 106E: Fingernail-polish remover is primarily acetone (C3H6O). How many acetone molecules are in a bottle... Problem 107E: 107. Complete the table.
Substance Mass Moles Number of Particles (atoms or... Problem 108E Problem 109E: Determine the chemical formula of each compound and refer to the formula to calculate the mass... Problem 110E Problem 111E Problem 112E Problem 113E: 113. A leak in the air conditioning system of an office building releases of per month. If the... Problem 114E: 114. A leak in the air conditioning system of an older car releases of per month. How much is... Problem 115E: 115. Hydrogen is a possible future fuel. However, elemental hydrogen is rare, so it must be obtained... Problem 116E Problem 117E: Complete the table of compounds that contain only carbon and hydrogen. Formula Molar Mass % C(by... Problem 118E: 118. Complete the table of compounds that contain only chromium and oxygen.
Formula Name Molar... Problem 119E: Butanedione, a component of butter and body odor, has a cheesy smell. Elemental analysis of... Problem 120E: 120. Caffeine, a stimulant found in coffee and soda, has the mass percent composition: C, ; H, N, ;... Problem 121E: 121. Nicotine, a stimulant found tobacco, has the mass percent composition: C, ; H,; N, . The molar... Problem 122E Problem 123E: 123. A sample contains both KBr and KI in unknown qualities. If the sample has a total mass of and... Problem 124E: 124. A sample contains both and Ne in unknown quantities. If the sample contains a combined total of... Problem 125E: Ethanethiol (C2H6S) is a compound with a disagreeable odor that is used to impart an odor to natural... Problem 126E: 126. Methanethiol has a disagreeable odor and is often a component of bad breath. When methanethiol... Problem 127E Problem 128E Problem 129E: you can use the concepts in this chapter to obtain an estimate of the number of atoms in the... Problem 130E Problem 131E: 131. In 1996, the media reported that possible evidence of life on Mars was found on a meteorite... Problem 132QGW: 132. Using grammatically correct English sentences, describe the relationship between the number ... Problem 133QGW: Discuss these questions with the group and record your consensus answer.
133. Imagine that all our... Problem 134QGW: Amylose is a polysaccharide that plants use to store energy. It is made of repeating subunits of... format_list_bulleted
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