Domanda del libro di testo
Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. (a) Write a balanced chemical equation for the reaction.
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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
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Brown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 66b
Brown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 66bCapitolo 3, Problema 66b
Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas. (b) How many grams of calcium hydride are needed to form 4.500 g of hydrogen?
Guida verificata passo dopo passo1
Write the balanced chemical equation for the reaction: \( \text{CaH}_2 + 2\text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + 2\text{H}_2 \).
Determine the molar mass of hydrogen gas (\( \text{H}_2 \)) using the periodic table. Hydrogen has an atomic mass of approximately 1.01 g/mol, so \( \text{H}_2 \) is about 2.02 g/mol.
Calculate the number of moles of hydrogen gas produced using the given mass (4.500 g) and the molar mass of hydrogen gas: \( \text{moles of } \text{H}_2 = \frac{4.500 \text{ g}}{2.02 \text{ g/mol}} \).
Use the stoichiometry of the balanced equation to find the moles of calcium hydride (\( \text{CaH}_2 \)) needed. According to the equation, 1 mole of \( \text{CaH}_2 \) produces 2 moles of \( \text{H}_2 \).
Calculate the mass of calcium hydride required using its molar mass. First, find the molar mass of \( \text{CaH}_2 \) (Ca: 40.08 g/mol, H: 1.01 g/mol), then use the moles of \( \text{CaH}_2 \) from the previous step to find the mass: \( \text{mass of } \text{CaH}_2 = \text{moles of } \text{CaH}_2 \times \text{molar mass of } \text{CaH}_2 \).
Concetti chiave
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Stoichiometry
Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows chemists to calculate the amounts of substances consumed and produced in a reaction based on balanced chemical equations. Understanding stoichiometry is essential for determining how much of a reactant is needed to produce a desired amount of product.
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01:16
Stoichiometry Concept
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 molecule. Knowing the molar mass of calcium hydride (CaH2) is crucial for converting between grams and moles, which is necessary for stoichiometric calculations in the given reaction.
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02:11Molar Mass Concept
Balanced Chemical Equation
A balanced chemical equation represents a chemical reaction with equal numbers of each type of atom on both sides of the equation. It ensures the law of conservation of mass is upheld. For the reaction between calcium hydride and water, the balanced equation is CaH2 + 2H2O → Ca(OH)2 + H2, which provides the necessary ratios of reactants and products to perform stoichiometric calculations.
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01:32Balancing Chemical Equations
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Automotive air bags inflate when sodium azide, NaN3, rapidly decomposes to its component elements: 2 NaN31s2¡2 Na1s2 + 3 N21g2 (c) How many grams of NaN3 are required to produce 10.0 ft3 of nitrogen gas, about the size of an automotive air bag, if the gas has a density of 1.25 g/L?
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