Problem 1ALQ: n chemistry, what is meant by the term mole? What is the importance of the mole concept? Problem 2ALQ: hat is the difference between the empirical and molecular for mulas of a compound? Can they ever be... Problem 3ALQ: substance A2B is 60% A by mass. Calculate the present B (by mass) for AB2 . Problem 4ALQ: ive the formula for calcium phosphate and then answer the following questions: l type='a'> Calculate... Problem 5ALQ: ow would you find the number of “chalk molecules” it takes to write your name on the hoard? Explain... Problem 6ALQ: 0.821 -mol sample of a substance composed of diatom of molecules has a mass of 131.3 g. Identify... Problem 7ALQ: ow many molecules of water are there in a 10.0-g sample of water? How many hydrogen atoms are there... Problem 8ALQ: hat is the mass (in grams) of one molecule of ammonia? Problem 9ALQ: onsider separate 100.0-g samples of each of the following: NH3 , N2O , N2H4 , HCN , HNO3 . Arrange... Problem 10ALQ: A molecule has a mass of 4.651023 g. Provide two possible chemical formulas for such a molecule. Problem 11ALQ: Differentiate between the terms atomic mass and molar mass. Problem 12ALQ: Consider Figure 4.19 in the text. Why is it that the formulas for ionic compounds are always... Problem 13ALQ: Why do we need to count atoms by weighing them? Problem 14ALQ: The following claim is made in your text: 1 mole of marbles is enough to cover the entire earth to a... Problem 15ALQ: Estimate the length of time it would take you to count to Ayogadro’s number. Provide mathematical... Problem 16ALQ: Suppose Avogadro’s number was 1000 instead of 6.0221023 . How, if at all, would this affect the... Problem 17ALQ: Estimate the number of atoms in your body and provide mathematical support. Because it is an... Problem 18ALQ: Consider separate equal mass samples of magnesium, zinc, and silver. Rank them from greatest to... Problem 19ALQ: You have a 20.0-g sample of silver metal. You are given 10.0 g of another metal and told that this... Problem 20ALQ: How would you find the number of “ink molecules” it takes to write your name on a piece of paper... Problem 21ALQ: True or false? The atom with the largest subscript in a formula is the atom with the largest percent... Problem 22ALQ: Which of the following compounds have the same empirical formulas? mg... Problem 23ALQ: The percent by mass of nitrogen is 46.7% for a species containing only nitrogen and oxygen. Which of... Problem 24ALQ Problem 25ALQ: Give the empirical formula for each of the compounds represented below. mg... Problem 1QAP: erchants usually sell small nuts, washers, and bolts by weight (like jelly beans!) rather than by... Problem 2QAP: he “Chemistry in Focus” segment Plastic That Talks and Listens! discusses polyvinylidene difluoride... Problem 3QAP: efine the amu. What is one amu equivalent to in grains? Problem 4QAP: hat do we mean by the average atomic mass of an element? What is “averaged” to arrive at this... Problem 5QAP: sing the average atomic masses for each of the following elements (see the table inside the cover of... Problem 6QAP: sing the average atomic masses for each of the following elements (see the table inside the front... Problem 7QAP Problem 8QAP: he atomic mass of copper is 63.55 amu. What would be the mass of 75 copper atoms? How many copper... Problem 9QAP: here are _________ iron atoms present in 55.85 g of iron. Problem 10QAP: There are 6.0221023 zinc atoms present in g of zinc. Problem 11QAP: Suppose you have a sample of sodium weighing 11.50 g. How many atoms of sodium are present in the... Problem 12QAP: Consider a sample of silver weighing 30OE0 g. How many at oms of silver are present in the sample?... Problem 13QAP: What mass of hydrogen contains the same number of atoms as 7.00 g of nitrogen? Problem 14QAP: What mass of cobalt contains the same number of atoms as 57.0 g of fluorine? Problem 15QAP: If an average sodium atom has a mass of 3.821023 g. what is the mass of a magnesium atom in grams? Problem 16QAP: Ifan average fluorine atom has a mass of 3.161023 g, what is the average mass of a chlorine atom in... Problem 17QAP: Which has the smaller mass, 1 mole of He atoms or 4 moles of H atoms? Problem 18QAP: Which weighs less, 0.25 mole of xenon atoms or 2.0 moles of carbon atoms? Problem 19QAP: Use the average atomic masses given inside the front cover of this book to calculate the number of... Problem 20QAP: Use the average atomic masses given inside the front cover of this hook to calculate the number of... Problem 21QAP: Use the average atomic masses given inside the front cover of this book to calculate the mass in... Problem 22QAP: Use the average atomic masses given inside the front cover ofthis book to calculate the mass in... Problem 23QAP: Using the average atomic masses given inside the front cover of this book, calculate the number of... Problem 24QAP: Using the average atomic masses given inside the front cover of this book, calculate the indicated... Problem 25QAP: The _________ of a substance is the mass (in grams) of 1 mole of the substance. Problem 26QAP Problem 27QAP: Give the name and calculate the molar mass for each of the following substances. l type="a"> H3PO4... Problem 28QAP: Give the name and calculate the molar mass for each of the following substances. l type="a"> KHCO3... Problem 29QAP: Write the formula and calculate the molar mass for each of the following substances. l type='a'>... Problem 30QAP: Write the formula and calculate the molar mass for each of the following substances. l type='a'>... Problem 31QAP: Calculate the number of moles of the indicated substance present in each of the following samples. l... Problem 32QAP Problem 33QAP Problem 34QAP: Calculate the number of moles of the indicated substance present in each of the following samples. l... Problem 35QAP: Calculate the mass in grams of each of the following samples. l type='a'> 1.25 moles of aluminum... Problem 36QAP: Calculate the mass in grams of each of the following samples. l type="a"> 6.14104 moles of sulfur... Problem 37QAP: Calculate the mass in grams of each of the following samples. l type="a"> 0.251 mole of ethyl... Problem 38QAP: Calculate the mass in grams of each of the following samples. l type="a"> 0.994 mole of benzene,... Problem 39QAP: Calculate the number of molecules present in each of the following samples. l type="a"> 4.75 mmol of... Problem 40QAP: Calculate the number of molecules present in each of the following samples. oles of sulfur dioxide,... Problem 41QAP: Calculate the number of moles of carbon atoms present in eachof the following samples. l type="a">... Problem 42QAP: Calculate the number of moles of sulfur atoms present in each of the following samples. l type='a'>... Problem 43QAP: The mass fraction of an element present in a compound can be obtained by comparing the mass of the... Problem 44QAP: If the amount of a sample doubles, what happens to the percent composition of each element in the... Problem 45QAP: lculate the percent by mass of each element in the following compounds. l type='a'> HClO3 i>UFl4... Problem 46QAP: Calculate the percent by mass of each element in the following compounds. l type="a"> ZnO i>Na2S... Problem 47QAP: Calculate the percent by mass of the element listed first in the formulas for each of the following... Problem 48QAP: Calculate the percent by mass of the element listed first in the formulas for each of the following... Problem 49QAP Problem 50QAP: What is the mass percent of oxygen in each of the following compounds? l type='a'> carbon dioxide... Problem 51QAP: For each of the following samples of ionic substances, calculate the number of moles and mass of the... Problem 52QAP: For each of the following ionic substances, calculate the percentage of the overall molar mass of... Problem 53QAP Problem 54QAP: Explain lo a friend who has not yet taken a chemistry course what is meant by the empirical formula... Problem 55QAP: Give the empirical formula that corresponds to each of the following molecular formulas. l type="a">... Problem 56QAP: Which of the following pairs of compounds have the same empirical formula? etylene, C2H2 , and... Problem 57QAP: A compound was analyzed and was found to contain the following percentages of the elements by mass:... Problem 58QAP: A compound was analyzed and was found to contain the following percentages of the elements by mass:... Problem 59QAP: A 0.59980-g sample of a new compound has been analyzed and found to contain the following masses of... Problem 60QAP: A compound was analyzed and was found to contain the following percentages of the elements by mass:... Problem 61QAP: If a 1.271-g sample of aluminum metal is heated in a chlorine gas atmosphere, the mass of aluminum... Problem 62QAP: A compound was analyzed and was found to contain the following percentages of the elements by mass:... Problem 63QAP: When 3.269 g of zinc is heated in pure oxygen, the sample gains 0.800 g of oxygen in forming the... Problem 64QAP: If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is produced that contains... Problem 65QAP: If 1.25 g of aluminum metal is heated in an atmosphere of fluorine gas. 3.89 g of aluminum fluoride... Problem 66QAP: If 2.50 g of aluminum metal is heated in a stream of fluorine gas, it is found that 5.28 g of... Problem 67QAP: A compound used ¡n the nuclear industry has the following composition: uranium. 67.61%; fluorine,... Problem 68QAP: A compound was analyzed and was found to contain the following percentages of the elements by mass:... Problem 69QAP: A compound has the following percentage composition by mass: copper, 33.88%; nitrogen, 14.94%;... Problem 70QAP: When lithium metal is heated strongly in an atmosphere of pure nitrogen, the product contains 59.78%... Problem 71QAP: A compound has been analyzed and has been found to have the following Composition: copper, 66.75%;... Problem 72QAP: Tetraphenylporphyrin is a synthetic compound that resembles naturally occurring porphyrins.... Problem 73QAP: When 1.00 mg of lithium metal is reacted with fluorine gas (F2) , the resulting fluoride salt has a... Problem 74QAP: Phosphorus and chlorine form two binary compounds, in which the percentages of phosphorus are 22.55%... Problem 75QAP: How does the molecular formula of a compound differ from the empirical formula? Can a compound’s... Problem 76QAP Problem 77QAP: A binary compound of boron and hydrogen has the following percentage composition: 78.14% boron.... Problem 78QAP: A compound with empirical formula CH was found by experiment to have a molar mass of approximately... Problem 79QAP: A compound with the empirical formula CH2 was found to have a molar mass of approximately 84 g. What... Problem 80QAP: A compound with empirical formula C2H5O was found in a separate experiment to have a molar mass of... Problem 81QAP: A compound having an approximate molar mass of 165170 g has the following percentage composition by... Problem 82QAP: A compound containing only sulfur and nitrogen is 69.6% S by mass. The molar mass is 184 g/mol. What... Problem 83AP: Use the periodic table shown in Fig. 4.9 to determine the atomic mass (per mole) or molar mass of... Problem 84AP: Complete the following table. l> Mass of Sample Moles of Sample Atoms in Sample 5.00 g AI td>... Problem 85AP: Complete the following table. l> Mass of Sample Moles of Sample Molecules in Sample Atoms in Sample... Problem 86AP: Consider a hypothetical compound composed of elements X, Y, and Z with the empirical formula X2YZ3 .... Problem 87AP: A binary compound of magnesium and nitrogen is analyzed, and 1.2791 g of the compound ¡s found to... Problem 88AP: When a 2.11 8-g sample of copper is heated in an atmosphere in which the amount of oxygen present is... Problem 89AP: Hydrogen gas reacts with each of the halogen elements to form the hydrogen halides (HF,HCl,HBr,HI) .... Problem 90AP: Calculate the number of atoms of each element present in each of the following samples. l type='a'>... Problem 91AP: Calculate the mass in grams of each of the following samples. l type='a'> 10,000,000,000 nitrogen... Problem 92AP: Calculate the mass of carbon in grams, the percent carbon by mass, and the number of individual... Problem 93AP: Find the item in column 2 that best explains or completes the statement or question in column 1. l... Problem 94AP: You have a sample of copper (Cu) and a sample of aluminum (Al). You have an equal number of atoms in... Problem 95AP: Calculate the number of grams of cobalt that contain the same number of atoms as 2.24 g of iron. Problem 96AP: A compound was analyzed and found to contain the following percentages of elements by mass: carbon,... Problem 97AP: Calculate the number of grains of lithium that contain the same number of atom as 1 .00 kg of... Problem 98AP: Given that the molar mass of carbon tetrachloride, CCl4 , is 153 g, calculate the mass in grams of 1... Problem 99AP: Calculate the mass in grains of hydrogen present in 2.500 g of each of the following compounds. l... Problem 100AP: f you have equal mole samples of NO2 and F2 , which of the following must be true? l type='a'> The... Problem 101AP: strikingly beautiful copper compound with the common name “blue vitriol” has the following elemental... Problem 102AP: certain transition metal ion (Mn+) forms a compound with oxygen (MxOy) . The molar mass of the... Problem 103AP Problem 104AP Problem 105AP Problem 106AP: f an average sodium atom weighs 22.99 amu, how many sodium atoms are contained in 1.981013 amu of... Problem 107AP Problem 108AP Problem 109AP Problem 110AP Problem 111AP Problem 112AP Problem 113AP: alculate the number of moles of the indicated substance present in each of the following samples. l... Problem 114AP: f you have equal-mole samples of each of the following compounds, which compound contains the... Problem 115AP Problem 116AP Problem 117AP: alculate the number of moles of hydrogen atoms present in each of the following samples. l type='a'>... Problem 118AP: ow many anions are there in 5.00 g of calcium bromide? Problem 119AP Problem 120AP Problem 121AP: 1.2569-g sample of a new compound has been analyzed and found to contain the following masses of... Problem 122AP: hat mass of sodium hydroxide has the same number of oxygen atoms as 100.0 g of ammonium carbonate? Problem 123AP: hen 2.004 g of calcium is heated in pure nitrogen gas. The sample gains 0.4670 g of nitrogen.... Problem 124AP: opical hydrocortisone is often used to treat a variety of skin conditions, such as insect bites,... Problem 125AP: hen 1.00 g of metallic chromium is heated with elemental chlorine gas. 3.045 g of a chromium... Problem 126AP: hen barium metal is heated in chlorine gas, a binary compound forms that consists of 65.95% Ba and... Problem 127CP Problem 128CP: itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is... Problem 129CP Problem 130CP: . How many atoms of carbon are present in 1 .0 g of CH4O ? How many atoms of carbon are present in... Problem 131CP: onsider samples of phosphine (PH3) , water (H2O) . Hydrogen sulfide (H2S) , and hydrogen fluoride... Problem 132CP: he chemical formula for aspirin is C9H8O4 . What is the mass percent for each element in 1 mole of... Problem 133CP Problem 134CP: compound with molar mass 180.1 g/mol has the following composition by mass: 40.0% 6.70% 53.3%... format_list_bulleted