Answer only number 2 II. Reaction Stoichiometry1. Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCI according tothe following equation:2Ga + 6HCI→→ 2GaCl₂ + 3H₂(a) Outline the steps necessary to determine the number of moles and mass of galliumchloride.(b) Perform the calculations outlined.2. Silver is often extracted from ores such as K[Ag(CN)₂] and then recovered by the reaction2K[Ag(CN)₂] (aq) + Zn (s) 2Ag (s) + Zn(CN)2 (aq) + 2KCN (aq)(a) How many molecules of Zn(CN)2 are produced by the reaction of 35.27 g ofK[Ag(CN)₂]?(b) What mass of Zn(CN)₂ is produced?3. Carborundum is silicon carbide, SiC, a very hard material used as an abrasive on sandpaperand in other applications. It is prepared by the reaction of pure sand, SiO2, with carbon at hightemperature. Carbon monoxide, CO, is the other product of this reaction. Write the balancedequation for the reaction, and calculate how much SiO₂ is required to produce 3.00 kg of SiC.4. Urea, CO(NH2)2, is manufactured on a large scale for use in producing urea-formaldehydeplastics and as a fertilizer. What is the maximum mass of urea that can be manufactured fromthe CO₂ produced by combustion of 1.00 x 10³ kg of carbon followed by the reaction?CO₂ (g) + 2NH3(g) CO (NHz)z (s) + H2O (I)

This can be solved using the concept of stoichiometry with unitry method as shown.

2. Silver is often extracted from ores such as K[Ag(CN)₂] and then recovered by the reaction 2K[Ag(CN)₂] (aq) + Zn (s) 2Ag (s) + Zn(CN)2 (aq) + 2KCN (aq) (a) How many molecules of Zn(CN)2 are produced by the reaction of 35.27 g K[Ag(CN)₂]? (b) What mass of Zn(CN)2 is produced?

2. Silver is often extracted from ores such as K[Ag(CN)₂] and then recovered by the reaction 2K[Ag(CN)₂] (aq) + Zn (s) 2Ag (s) + Zn(CN)2 (aq) + 2KCN (aq) (a) How many molecules of Zn(CN)2 are produced by the reaction of 35.27 g K[Ag(CN)₂]? (b) What mass of Zn(CN)2 is produced?

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter15: Acid–base Equilibria

Section: Chapter Questions

Problem 98AP

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

Answer only number 2

II. Reaction Stoichiometry
1. Gallium chloride is formed by the reaction of 2.6 L of a 1.44 M solution of HCI according to
the following equation:
2Ga + 6HCI→→ 2GaCl₂ + 3H₂
(a) Outline the steps necessary to determine the number of moles and mass of gallium
chloride.
(b) Perform the calculations outlined.
2. Silver is often extracted from ores such as K[Ag(CN)₂] and then recovered by the reaction
2K[Ag(CN)₂] (aq) + Zn (s) 2Ag (s) + Zn(CN)2 (aq) + 2KCN (aq)
(a) How many molecules of Zn(CN)2 are produced by the reaction of 35.27 g of
K[Ag(CN)₂]?
(b) What mass of Zn(CN)₂ is produced?
3. Carborundum is silicon carbide, SiC, a very hard material used as an abrasive on sandpaper
and in other applications. It is prepared by the reaction of pure sand, SiO2, with carbon at high
temperature. Carbon monoxide, CO, is the other product of this reaction. Write the balanced
equation for the reaction, and calculate how much SiO₂ is required to produce 3.00 kg of SiC.
4. Urea, CO(NH2)2, is manufactured on a large scale for use in producing urea-formaldehyde
plastics and as a fertilizer. What is the maximum mass of urea that can be manufactured from
the CO₂ produced by combustion of 1.00 x 10³ kg of carbon followed by the reaction?
CO₂ (g) + 2NH3(g) CO (NHz)z (s) + H2O (I)

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