BIUA O D O三。三三New.. -201. What does the average atomic mass of an element represent? What unit is used foraverage atomic mass?2. Define molar mass. Using K,0 as an example, calculate the molar mass from theatomic masses of the elements.3. What is meant by the percent composition by mass for a compound? Determine thepercent composition by mass for water.4. For 5.00-g samples of each of the following substances, calculate the number of molesof the substance present, as well as the number of atoms of each type present in thesample:a. Cu(s)b. NH,(g)c. KCIO,(s)d. Ca(OH),(s)5. For the compounds in question 4, calculate the percent by mass of each elementpresent in the compounds.6. Define, compare, and contrast what are meant by the empirical and molecularformulas for a substance. Give an example of each.SAMSUNG口

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1. What does the average atomic mass of an element represent? What unit is used for average atomic mass? 2. Define molar mass. Using K,O as an example, calculate the molar mass from the

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter8: Chemical Composition

Section: Chapter Questions

Problem 128CP: itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is...

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Considering your answer to Exercise 79, which type of formula, empirical or molecular, can be obtained from elemental analysis that gives percent composition?
Find the item in column 2 that best explains or completes the statement or question in column 1. l type="a"> Column 1 i>1 amu 1008 amu mass of the “average” atom of an element number of carbon atoms in 12.01 g of carbon 6.0221023 molecules total mass of all atoms in 1 mole of a compound smallest whole-number ratio of atoms present in a molecule formula showing actual number of atoms present in a molecule product formed when any carbon-containing compound is burned in O2 i>have the same empirical formulas, but different molecular formulas Column 2 msp;6.0221023 i>atomic mass mass of 1000 hydrogen atoms benzene, C6H6 , and acetylene, C2H2 i>carbon dioxide empirical formula 1.661023g i>molecular formula molar mass 1 mole
High-density lipoprotein (HDL) cholesterol is the good cholesterol because adequate levels reduce the risk of heart disease and stroke. HDL levels between 40. and 59 mg/dL are typical for a healthy individual. What is this range of HDL cholesterol in units of mol/L? The formula for cholesterol is C27H46O.
In chemistry, what is meant by the term mole? What is the importance of the mole concept?
One chocolate chip used in making chocolate chip cookies has a mass of 0.324 g. (a) How many chocolate chips are there in one mole of chocolate chips? (b) If a cookie needs IS chocolate chips, how many cookies can one make with a billionth (1109) of a mole of chocolate chips? (A billionth of a mole is scientifically known as a nanomole.)
itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is C63H88CoN14O14P . A lack of this vita min in the diet can lead to anemia. Cyanocohalamin is the form of the vitamin found in vitamin supplements. l type='a'> What is the molar mass of cyanocobalamin to two decimal places? How many moles of cyanocohalamin molecules are present in 250 mg of cyanocobalamin? What is the mass of 0.60 mole of cyanocobalamin? How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? What is the mass of 1.0107 molecules of cyanocobalamin? What is the mass (in grams) of one molecule of cyanocobalamin?
erhaps the most important concept in introductory chemistry concerns what a mole of a substance represents. The mole concept will come up again and again in later chapters in this book. What does one mole of a substance represent on a microscopic, atomic basis? What does one mole of a substance represent on a macroscopic, mass basis? Why have chemists defined the mole in this manner?
Suppose Avogadro’s number was 1000 instead of 6.0221023 . How, if at all, would this affect the relative masses on the periodic table? How, if at all, would this affect the absolute masses of the elements?
substance A2B is 60% A by mass. Calculate the present B (by mass) for AB2 .
f an average sodium atom weighs 22.99 amu, how many sodium atoms are contained in 1.981013 amu of sodium? What will 3.011023 sodium atoms weigh?
Silver is often extracted from ores such as K[Ag(CN)2] and then recovered by the reaction 2K[Ag(CN)2](aq)+Zn(s)2Ag(s)+Zn(CN)2(aq)+2KCN(aq) (a) How many molecules of Zn(CN)2 are produced by the reaction of 35.27 g of K[Ag(CN)2]? (b) What mass of Zn(CN)2 is produced?
a How many molecules are in 3.61g F2? b How many atoms are in 3.61g F2? c How many atoms are in 3.61g F? d What is the mass of 3.611023 F atoms? e What is the mass of 3.611023 F2 molecules?