Introductory Chemistry: A Foundation
8th Edition
ISBN: 9781285199030
Author: Steven S. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 15ALQ
Estimate the length of time it would take you to count to Ayogadro’s number. Provide mathematical support.
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Mole is the term used to express the quantities of substances involved in a chemical reaction. Mole is defined as the amount of a substance that contains Avogadro's number of particles
(atoms, ions, molecules, etc.). Avogadro's number is defined as the number of atoms present in 12 g of carbon-12 isotope, with a numerical value equal to 6.022 x 1023. The mole is a
unit similar to a dozen; one dozen
equivalent to 12 the same way that one mole is equivalent to 6.022 x 1023.
You could use this information to write equalities:
12 molecules of H2O = 1 dozen of H2O
6.022 x 1023 molecules of H2O = 1 mol of H2O
For example, if I had 18 molecules of water, I would have
18 molecules of water x
dozen of water
= 1.5 dozen of water
12 molecules of water
Molar mass is the mass in grams of 1 mol of substance numerically equal to molecular weight in amu (atomic mass unit). Mass is a measure of quantity, and when you use a balance to
weigh a sample, the scale is using a set of standards to determine…
you are to determine the molecular formula for a molecular compound consisting of only carbon & hydrogen. The molar mass of this compound is 42.08 g/mol.
Part D:
The empirical formula has a molar mass of 14.026 g/mol (this is called the empirical molar mass). Divide the molar mass for the total compound given above by the empirical formula molar mass.
This will give you a number for multiplying the carbon atoms and hydrogen atoms in the empirical formula.
What is the multiplication value?
Without using a calculator, which has the greater mass: One mole of carbon atoms or one mole of chlorine atoms? Explain your reasoning. What is the benefit of using moles when working with atoms and molecules in a lab setting? How does this relate to the concept of molarity?
Chapter 8 Solutions
Introductory Chemistry: A Foundation
Ch. 8.2 - ercise 8.1 Calculate the mass of a sample that...Ch. 8.2 - Prob. 8.2SCCh. 8.3 - at if you were offered $1 million to count from 1...Ch. 8.3 - at if you discovered Avogadro’s number was not...Ch. 8.3 - ercise 8.3 Chromium (Cr) is a metal that is added...Ch. 8.5 - ercise 8.4 Polyvinyl chloride (called PVC), which...Ch. 8.5 - ercise 8.5 Calculate the molar mass for sodium...Ch. 8.5 - ercise 8.6 The substance Teflon, the slippery...Ch. 8.6 - ercise 8.7 Penicillin, an important antibiotic...Ch. 8.8 - ercise 8.8 In a lab experiment it was observed...
Ch. 8.8 - trong>Exercise 8.9 Sevin, the commercial name for...Ch. 8.8 - e part of the problem-solving strategy for...Ch. 8.8 - ercise 8.10 The most common form of nylon...Ch. 8.9 - Exercise 8.11 A compound used as an additive for...Ch. 8 - n chemistry, what is meant by the term mole? What...Ch. 8 - hat is the difference between the empirical and...Ch. 8 - substance A2B is 60% A by mass. Calculate the...Ch. 8 - ive the formula for calcium phosphate and then...Ch. 8 - ow would you find the number of “chalk molecules”...Ch. 8 - 0.821 -mol sample of a substance composed of...Ch. 8 - ow many molecules of water are there in a 10.0-g...Ch. 8 - hat is the mass (in grams) of one molecule of...Ch. 8 - onsider separate 100.0-g samples of each of the...Ch. 8 - A molecule has a mass of 4.651023 g. Provide two...Ch. 8 - Differentiate between the terms atomic mass and...Ch. 8 - Consider Figure 4.19 in the text. Why is it that...Ch. 8 - Why do we need to count atoms by weighing them?Ch. 8 - The following claim is made in your text: 1 mole...Ch. 8 - Estimate the length of time it would take you to...Ch. 8 - Suppose Avogadro’s number was 1000 instead of...Ch. 8 - Estimate the number of atoms in your body and...Ch. 8 - Consider separate equal mass samples of magnesium,...Ch. 8 - You have a 20.0-g sample of silver metal. You are...Ch. 8 - How would you find the number of “ink molecules”...Ch. 8 - True or false? The atom with the largest subscript...Ch. 8 - Which of the following compounds have the same...Ch. 8 - The percent by mass of nitrogen is 46.7% for a...Ch. 8 - Prob. 24ALQCh. 8 - Give the empirical formula for each of the...Ch. 8 - erchants usually sell small nuts, washers, and...Ch. 8 - he “Chemistry in Focus” segment Plastic That Talks...Ch. 8 - efine the amu. What is one amu equivalent to in...Ch. 8 - hat do we mean by the average atomic mass of an...Ch. 8 - sing the average atomic masses for each of the...Ch. 8 - sing the average atomic masses for each of the...Ch. 8 - Prob. 7QAPCh. 8 - The atomic mass of bromine is 79.90 amu. What...Ch. 8 - here are _________ iron atoms present in 55.85 g...Ch. 8 - There are 6.0221023 zinc atoms present in g of...Ch. 8 - Suppose you have a sample of sodium weighing 11.50...Ch. 8 - Consider a sample of silver weighing 30OE0 g. How...Ch. 8 - What mass of hydrogen contains the same number of...Ch. 8 - What mass of cobalt contains the same number of...Ch. 8 - If an average sodium atom has a mass of 3.821023...Ch. 8 - Ifan average fluorine atom has a mass of 3.161023...Ch. 8 - Which has the smaller mass, 1 mole of He atoms or...Ch. 8 - Which weighs less, 0.25 mole of xenon atoms or 2.0...Ch. 8 - Use the average atomic masses given inside the...Ch. 8 - Use the average atomic masses given inside the...Ch. 8 - Use the average atomic masses given inside the...Ch. 8 - Use the average atomic masses given inside the...Ch. 8 - Using the average atomic masses given inside the...Ch. 8 - Using the average atomic masses given inside the...Ch. 8 - The _________ of a substance is the mass (in...Ch. 8 - Prob. 26QAPCh. 8 - Give the name and calculate the molar mass for...Ch. 8 - Give the name and calculate the molar mass for...Ch. 8 - Write the formula and calculate the molar mass for...Ch. 8 - Prob. 30QAPCh. 8 - Calculate the number of moles of the indicated...Ch. 8 - Prob. 32QAPCh. 8 - Prob. 33QAPCh. 8 - Calculate the number of moles of the indicated...Ch. 8 - Calculate the mass in grams of each of the...Ch. 8 - Calculate the mass in grams of each of the...Ch. 8 - Calculate the mass in grams of each of the...Ch. 8 - Calculate the mass in grams of each of the...Ch. 8 - Calculate the number of molecules present in each...Ch. 8 - Calculate the number of molecules present in each...Ch. 8 - Calculate the number of moles of carbon atoms...Ch. 8 - Calculate the number of moles of sulfur atoms...Ch. 8 - The mass fraction of an element present in a...Ch. 8 - If the amount of a sample doubles, what happens to...Ch. 8 - lculate the percent by mass of each element in the...Ch. 8 - Calculate the percent by mass of each element in...Ch. 8 - Calculate the percent by mass of the element...Ch. 8 - Calculate the percent by mass of the element...Ch. 8 - Prob. 49QAPCh. 8 - What is the mass percent of oxygen in each of the...Ch. 8 - For each of the following samples of ionic...Ch. 8 - For each of the following ionic substances,...Ch. 8 - Prob. 53QAPCh. 8 - Explain lo a friend who has not yet taken a...Ch. 8 - Give the empirical formula that corresponds to...Ch. 8 - Which of the following pairs of compounds have the...Ch. 8 - A compound was analyzed and was found to contain...Ch. 8 - A compound was analyzed and was found to contain...Ch. 8 - A 0.59980-g sample of a new compound has been...Ch. 8 - A compound was analyzed and was found to contain...Ch. 8 - If a 1.271-g sample of aluminum metal is heated in...Ch. 8 - A compound was analyzed and was found to contain...Ch. 8 - When 3.269 g of zinc is heated in pure oxygen, the...Ch. 8 - If cobalt metal is mixed with excess sulfur and...Ch. 8 - If 1.25 g of aluminum metal is heated in an...Ch. 8 - If 2.50 g of aluminum metal is heated in a stream...Ch. 8 - A compound used ¡n the nuclear industry has the...Ch. 8 - A compound was analyzed and was found to contain...Ch. 8 - A compound has the following percentage...Ch. 8 - When lithium metal is heated strongly in an...Ch. 8 - A compound has been analyzed and has been found to...Ch. 8 - Tetraphenylporphyrin is a synthetic compound that...Ch. 8 - When 1.00 mg of lithium metal is reacted with...Ch. 8 - Phosphorus and chlorine form two binary compounds,...Ch. 8 - How does the molecular formula of a compound...Ch. 8 - Prob. 76QAPCh. 8 - A binary compound of boron and hydrogen has the...Ch. 8 - A compound with empirical formula CH was found by...Ch. 8 - A compound with the empirical formula CH2 was...Ch. 8 - A compound with empirical formula C2H5O was found...Ch. 8 - A compound having an approximate molar mass of...Ch. 8 - A compound consists of carbon and hydrogen. The...Ch. 8 - Use the periodic table shown in Fig. 4.9 to...Ch. 8 - Complete the following table. l> Mass of Sample...Ch. 8 - Complete the following table. l> Mass of Sample...Ch. 8 - Consider a hypothetical compound composed of...Ch. 8 - A binary compound of magnesium and nitrogen is...Ch. 8 - When a 2.11 8-g sample of copper is heated in an...Ch. 8 - Hydrogen gas reacts with each of the halogen...Ch. 8 - Calculate the number of atoms of each element...Ch. 8 - Calculate the mass in grams of each of the...Ch. 8 - Calculate the mass of carbon in grams, the percent...Ch. 8 - Find the item in column 2 that best explains or...Ch. 8 - Prob. 94APCh. 8 - Calculate the number of grams of cobalt that...Ch. 8 - Prob. 96APCh. 8 - Calculate the number of grains of lithium that...Ch. 8 - Given that the molar mass of carbon tetrachloride,...Ch. 8 - Calculate the mass in grains of hydrogen present...Ch. 8 - f you have equal mole samples of NO2 and F2 ,...Ch. 8 - strikingly beautiful copper compound with the...Ch. 8 - Prob. 102APCh. 8 - Prob. 103APCh. 8 - Prob. 104APCh. 8 - Prob. 105APCh. 8 - f an average sodium atom weighs 22.99 amu, how...Ch. 8 - Prob. 107APCh. 8 - Prob. 108APCh. 8 - Prob. 109APCh. 8 - Prob. 110APCh. 8 - Prob. 111APCh. 8 - Prob. 112APCh. 8 - alculate the number of moles of the indicated...Ch. 8 - Consider equal mole samples of tetraphosphorus...Ch. 8 - Prob. 115APCh. 8 - Prob. 116APCh. 8 - alculate the number of moles of hydrogen atoms...Ch. 8 - ow many anions are there in 5.00 g of calcium...Ch. 8 - Prob. 119APCh. 8 - Prob. 120APCh. 8 - 1.2569-g sample of a new compound has been...Ch. 8 - hat mass of sodium hydroxide has the same number...Ch. 8 - hen 2.004 g of calcium is heated in pure nitrogen...Ch. 8 - You find a compound composed only of element X and...Ch. 8 - hen 1.00 g of metallic chromium is heated with...Ch. 8 - hen barium metal is heated in chlorine gas, a...Ch. 8 - Prob. 127CPCh. 8 - itamin B12 , cyancobalamin, is essential for human...Ch. 8 - Prob. 129CPCh. 8 - . How many atoms of carbon are present in 1 .0 g...Ch. 8 - onsider samples of phosphine (PH3) , water (H2O) ....Ch. 8 - he chemical formula for aspirin is C9H8O4 . What...Ch. 8 - Prob. 133CPCh. 8 - compound with molar mass 180.1 g/mol has the...
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