Chemistry In Focus
Chemistry In Focus
6th Edition
ISBN: 9781305084476
Author: Tro, Nivaldo J., Neu, Don.
Publisher: Cengage Learning
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Textbook Question
Chapter 3, Problem 48E

What is the mass of each sample?

a.2.75 mol Fe

b.0.115 mol Al

c.125 mol Si

d.1 Ni atom

Expert Solution & Answer
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Interpretation Introduction

Interpretation:

The mass of each sample is to be calculated.

Concept Introduction:

 A mole is a unit of amount of substance. It relates the number of particles to the molar mass.

 One mole of a substance contains Avogadro’s number that is 6.022×1023 particles. The number remains constant regardless of the nature of the substance. One mole of an atom contains 6.022×1023 atoms. One mole of molecules contains 6.022×1023 molecules.

 It also relates to the molar mass of a substance in grams. One mole of a substance weighs that amount in grams which is equal to its molar mass.

Answer to Problem 48E

a) 154 g

b) 3.10 g 

c) 35.1×103 g 

d) 9.746×1023 g

Explanation of Solution

a) 2.75 mole Fe

The mass of Fe is calculated as follows:

The molar mass of Fe is 55.84 g.

Mass of 1 mole of Fe = 55.84 gMass of 2.75 mole of Fe = 55.84 g1mole ×2.75mole                                      = 154 g 

Therefore, the mass of Fe is 154 g 

b) 0.115 moles Al

The mass of Al is calculated as follows:

The molar mass of Al is 27 g.

Mass of 1 mole of Al = 27 gMass of 0.115 moles of Al = 27 g1mole ×0.115mole                                      = 3.10 g 

Thus, the mass of Al is 3.10 g.

c) 125 moles Si

The mass of Si is calculated as follows:

The molar mass of Si is 28.1 g.

Mass of 1 mole of Si = 28.1 gMass of 125 moles of Si = 28.1 g1mole ×125mole                                      = 35.1×103 g 

Hence, the mass of Si is 35.1×103 g .

d) 1 Ni atom

The mass of Ni is calculated as follows:

The molar mass of Ni is 58.7 g.

6.022 ×1023 atoms of Ni = 1 mole of Ni1 atoms of Ni =  1 mole6.022×1023 atoms×1 atoms                     =  1.67 × 10-24 molesMass of 1 mole of Ni = 58.7 gMass of 1.67 ×10-24 moles of Ni = 1 atom Ni1×1 mol Ni6.022×1023 atom×58.69 g1 mole                                                     = 9.746×1023 g

Hence, the mass of Ni is 9.746×1023 g.

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Chapter 3 Solutions

Chemistry In Focus

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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