Chemistry In Focus
7th Edition
ISBN: 9781337399692
Author: Tro, Nivaldo J.
Publisher: Cengage Learning,
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Textbook Question
Chapter 3, Problem 61E
Why does Avogadro’s number have such an odd value? Why not pick a nice round number like
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What if you discovered Avogadro’s number was not 6.02 3 1023 but 3.01 3 1023? Would this affect the relative masses given on the periodic table? If so, how?
Do you round before or after multiplying the molecular mass of an element for example I multiplied C12 which is 12*12.011 and got 144.32 (amu) but the correct answer was 144.12 (amu) and that was found by doing 12*12.01 ?
How many moles of aluminum do 5.80×1024 aluminum atoms represent?
Express your answer using three significant figures.
Chapter 3 Solutions
Chemistry In Focus
Ch. 3 - Determining the Number of Protons and Electrons in...Ch. 3 - Prob. 3.2YTCh. 3 - Determining Protons, Neutrons, and Electrons How...Ch. 3 - Calculating Atomic Mass Magnesium has three...Ch. 3 - The Mole Concept A diamond, which is pure carbon,...Ch. 3 - The Mole Concept II Calculate the number of atoms...Ch. 3 - Your friend tells you about an article that he...Ch. 3 - Prob. 2SCCh. 3 - Prob. 3SCCh. 3 - Copper is composed of two naturally occurring...
Ch. 3 - Prob. 5SCCh. 3 - Which pair of elements do you expect to be most...Ch. 3 - Which statement is true of the quantum mechanical...Ch. 3 - Why is it important to understand atoms?Ch. 3 - Prob. 2ECh. 3 - What defines an element? How many naturally...Ch. 3 - Prob. 4ECh. 3 - Prob. 5ECh. 3 - Prob. 6ECh. 3 - Prob. 7ECh. 3 - Prob. 8ECh. 3 - Prob. 9ECh. 3 - Prob. 10ECh. 3 - Explain the quantum mechanical model for the atom....Ch. 3 - Give two examples of each: a. alkali metal b....Ch. 3 - Which elements exist as diatomic molecules?Ch. 3 - Explain the difference and similarity between...Ch. 3 - Prob. 15ECh. 3 - Determine the charge of each of the following: a...Ch. 3 - Determine the number of protons and electrons in...Ch. 3 - Determine the number of protons and electrons in...Ch. 3 - Give the atomic number (Z) and the mass number (A)...Ch. 3 - Prob. 20ECh. 3 - The following isotopes have applications in...Ch. 3 - The following isotopes are important in nuclear...Ch. 3 - 14C is used in carbon dating of artifacts....Ch. 3 - 40K is used to measure the age of Earth. Determine...Ch. 3 - Prob. 25ECh. 3 - Prob. 26ECh. 3 - Give electron configurations according to the Bohr...Ch. 3 - Give electron configurations according to the Bohr...Ch. 3 - Prob. 29ECh. 3 - How many valence electrons are in each element of...Ch. 3 - Prob. 31ECh. 3 - Draw electron configurations for each of the...Ch. 3 - Which two of the following elements would you...Ch. 3 - Group the following elements into three similar...Ch. 3 - We have seen that the reactivity of an element is...Ch. 3 - What is the electron configuration of Mg2+? How...Ch. 3 - Classify each of the following elements as a...Ch. 3 - Classify each of the following as a metal, a...Ch. 3 - Calculate the atomic mass of neon (Ne), which is...Ch. 3 - An element has two naturally occurring isotopes....Ch. 3 - A fictitious element has two naturally occurring...Ch. 3 - Copper has two naturally occurring isotopes. Cu-63...Ch. 3 - How many moles of titanium are present in 124 g of...Ch. 3 - Prob. 44ECh. 3 - How many moles are there in each sample? a. 45 mg...Ch. 3 - How many moles are there in each sample? a. 55.0 g...Ch. 3 - What is the mass of each sample? a.1.8 mol S...Ch. 3 - What is the mass of each sample? a.2.75 mol Fe...Ch. 3 - Determine the number of atoms in each sample....Ch. 3 - Determine the number of atoms in each sample....Ch. 3 - How many Ag atoms are present in a piece of pure...Ch. 3 - How many platinum atoms are in a pure platinum...Ch. 3 - A pure gold necklace has a volume of 1.8cm3. How...Ch. 3 - A titanium bicycle component has a volume of...Ch. 3 - An iron sphere has a radius of 3.4 cm. How many...Ch. 3 - Calculate the number of atoms in the universe. The...Ch. 3 - The introduction to this chapter states that...Ch. 3 - Suppose the absolute value of the charge of the...Ch. 3 - When we refer to doughnuts or cookies, we often...Ch. 3 - Prob. 60ECh. 3 - Why does Avogadros number have such an odd value?...Ch. 3 - Prob. 62ECh. 3 - Prob. 63ECh. 3 - Prob. 64ECh. 3 - Here are three fictitious elements and a molecular...Ch. 3 - Prob. 66ECh. 3 - Gather any two of the following items, measure...
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- How many protons and electrons are there in a neutral atom of each of the following elements? manganese Express your answer as an integer. Np=Ne= iodine Express your answer as an integer. Np=Ne= phosphorus Express your answer as an integer. Np=Ne=arrow_forwardIn 1961, scientists agreed that the atomic mass unit (amu) would be defined as 1/ 12 the mass of an atom of 12C. Before then, it was defined as 1 /16 the average mass of an atom of naturally occurring oxygen (a mixture of 16O, 17O, and 18O). The current atomic mass of oxygen is 15.9994 amu. (a) Did Avogadro’s number change after the definition of an amu changed and, if so, in what direction? (b) Did the definition of the mole change? (c) Did the mass of a mole of a substance change? (d) Before 1961, was Avogadro’s number 6.02x1023 (to three significant figures), as it is today?arrow_forwardConversion If you could count individual atoms at the rate of one atom per second, about how many years would be required to count 6.02 x 10^23 atoms?arrow_forward
- Gallium is composed of two naturally occurring isotopes: Ga−69 (60.108%) and Ga−71. The ratio of the masses of the two isotopes is 1.0290. What is the mass of Ga−69Ga−69? Express your answer with the appropriate units.arrow_forwardWhy would the collective mass of twenty pennies not be equal to ‘20 x’ the mass of any individual penny?arrow_forwardFind the mass of 1 molecule of NaH in gram. a. 12 b. 3.98 x10-23 c. 23.99 d. 3.98 x1023arrow_forward
- What is the mass in 3.52 x 10^23 water molecules?arrow_forwardEach atom in a crystal of aluminum metal occupies a theoretical cube that is 0.255 nm on a side. If the density of the aluminum crystal is 2.70 g/cm3, what is the experimental value of Avogadro's number?arrow_forward1. Determine the number of atoms in 0.475 g of palladium (Pd). atoms 2. Determine the mass of 139 protons of palladium.arrow_forward
- I am confused on which periodic table to go by since right now I am determining the molecular mass of an element for example 3 oxygen or O3. Would I do 3 x 16.00 or 3 x 15.9994 ? Thank you!arrow_forwardAssume a 1.2 kg sample of a compound contains 0.9 kg of carbon. to one decimal place there are how many kilograms of carbon contained in a different 1.2 kg sample of the same compound?arrow_forwardCalculate the mass of 8.4 x 1 0 24 molecules of carbon dioxide (dry ice) (Hint: first calculate the number of molecules.) [ans: 6.1 x io 2 g]arrow_forward
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