Textbook Question
Calculate the following quantities: (d) number of N atoms in 0.410 mol NH3
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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement140
- Ch.2 - Atoms, Molecules, and Ions192
- Ch.3 - Chemical Reactions and Reaction Stoichiometry172
- Ch.4 - Reactions in Aqueous Solution156
- Ch.5 - Thermochemistry151
- Ch.6 - Electronic Structure of Atoms137
- Ch.7 - Periodic Properties of the Elements127
- Ch.8 - Basic Concepts of Chemical Bonding143
- Ch.9 - Molecular Geometry and Bonding Theories167
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces97
- Ch.12 - Solids and Modern Materials129
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics175
- Ch.15 - Chemical Equilibrium107
- Ch.16 - Acid-Base Equilibria127
- Ch.17 - Additional Aspects of Aqueous Equilibria133
- Ch.18 - Chemistry of the Environment88
- Ch.19 - Chemical Thermodynamics140
- Ch.20 - Electrochemistry137
- Ch.21 - Nuclear Chemistry99
- Ch.22 - Chemistry of the Nonmetals66
- Ch.23 - Transition Metals and Coordination Chemistry69
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry11
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 3, Problem 35b
Calculate the following quantities: (b) moles of Zn(NO3)2 in 143.50 g of this substance
Verified step by step guidance1
First, determine the molar mass of Zn(NO3)2. To do this, add the atomic masses of all the atoms in the formula: Zn, N, and O. Use the periodic table to find these values: Zn = 65.38 g/mol, N = 14.01 g/mol, and O = 16.00 g/mol.
Calculate the molar mass of Zn(NO3)2 by adding the atomic masses: 1 Zn atom, 2 N atoms, and 6 O atoms. The formula is: Molar mass = (1 * 65.38) + (2 * 14.01) + (6 * 16.00).
Once you have the molar mass, use it to convert grams to moles. The formula to use is: moles = mass (g) / molar mass (g/mol).
Substitute the given mass of Zn(NO3)2, which is 143.50 g, and the calculated molar mass into the formula to find the number of moles.
Perform the division to find the moles of Zn(NO3)2 in 143.50 g. This will give you the quantity in moles.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a chemical formula. For zinc nitrate, Zn(NO3)2, the molar mass can be determined by adding the atomic mass of zinc (Zn) and twice the sum of the atomic masses of nitrogen (N) and three times the atomic mass of oxygen (O).
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Moles
A mole is a unit in chemistry that represents 6.022 x 10^23 entities, such as atoms or molecules. It provides a bridge between the atomic scale and macroscopic quantities, allowing chemists to count particles by weighing them. The number of moles of a substance can be calculated using the formula: moles = mass (g) / molar mass (g/mol).
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Stoichiometry
Stoichiometry is the area of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows chemists to predict the amounts of substances consumed and produced in a reaction based on balanced chemical equations. In this context, stoichiometry is essential for converting mass to moles, which is crucial for understanding the composition of compounds like Zn(NO3)2.
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