Chemistry In Focus
6th Edition
ISBN: 9781305084476
Author: Tro, Nivaldo J., Neu, Don.
Publisher: Cengage Learning
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Chapter 3, Problem 17E
Determine the number of protons and electrons in each of the following ions:
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Boron (B;Z=5) has two naturally occurring isotopes. Find the percent abundances of ¹²B and ¹¹B given the atomic mass of B=1081 amu,the isotopic mass = B= 10.0129 amu, and the isotopic mass of ¹¹B=11.0093 amu.
Element X has two stable isotopes:
35X - 75.77%, 34.97 amu
37X - 36.97%, 36.97 amu
a. Calculate the average atomic mass of X. Report your answer to 4 significant figures.
b. Using the periodic table, identify element X.
A 7.08 gsample of copper is contaminated with an additional 0.80 gof zinc. Suppose an atomic mass measurement was performed on this sample.
Part A What would be the measured atomic mass?Express your answer to four significant figures and include the appropriate units.
A=
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 - Prob. 1SCCh. 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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- Radon is a radioactive gas that can cause lung cancer. It has been detected in the basement of some homes. In an atom of Rn-220, (a) how many protons are there? (b) how many neutrons are there?arrow_forwardSeveral compounds containing sulfur and fluorine are known. Three of them have the following compositions: i. 1.188 g of F for every 1.000 g of S ii. 2.375 g of F for every 1.000 g of S iii. 3.563 g of F for every 1.000 g of S How do these data illustrate the law of multiple proportions?arrow_forwardHow many platinum atoms are in a pure platinum ring weighing 4.32 g?arrow_forward
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