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Ch.3 - Mass Relationships in Chemical Reactions
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.3 - Mass Relationships in Chemical ReactionsProblema 84b
Capitolo 3, Problema 84b

The reaction of tungsten hexachloride (WCl6) with bismuth gives hexatungsten dodecachloride (W6Cl12).
WCl6 + Bi → W6Cl12 + BiCl3 Unbalanced
(b) How many grams of bismuth react with 150.0 g of WCl6?

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1
Step 1: Write the balanced chemical equation for the reaction. Start by balancing the number of tungsten (W) atoms, chlorine (Cl) atoms, and bismuth (Bi) atoms on both sides of the equation.
Step 2: Calculate the molar mass of WCl_6 using the atomic masses of tungsten (W) and chlorine (Cl).
Step 3: Convert the given mass of WCl_6 (150.0 g) to moles using its molar mass.
Step 4: Use the stoichiometry of the balanced equation to determine the moles of bismuth (Bi) required to react with the calculated moles of WCl_6.
Step 5: Calculate the mass of bismuth needed by multiplying the moles of bismuth by its molar mass.

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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 how much of each substance is needed or produced in a reaction based on balanced chemical equations. Understanding stoichiometry is essential for solving problems involving mass, moles, and the ratios of reactants and products.
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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 reactants and products is crucial for converting between grams and moles, which is necessary for stoichiometric calculations in chemical reactions.
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Balancing Chemical Equations

Balancing chemical equations involves ensuring that the number of atoms for each element is the same on both sides of the equation. This is important because it reflects the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. A balanced equation provides the correct stoichiometric ratios needed to calculate the amounts of reactants and products involved.
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The reaction of tungsten hexachloride (WCl6) with bismuth gives hexatungsten dodecachloride (W6Cl12).

WCl6 + Bi → W6Cl12 + BiCl3 Unbalanced

(c) When 228 g of WCl6 react with 175 g of Bi, how much W6Cl12 is formed based on the limiting reactant?

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The reaction of tungsten hexachloride (WCl6) with bismuth gives hexatungsten dodecachloride (W6Cl12).

WCl6 + Bi → W6Cl12 + BiCl3 Unbalanced

(a) Balance the equation.

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