Stoichiometry Chemistry Example 4

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Example 4

medium
How many grams of NaCl\text{NaCl} form from 0.500.50 mol of Cl2\text{Cl}_2 reacting with excess sodium? (2Na+Cl2→2NaCl2\text{Na} + \text{Cl}_2 \rightarrow 2\text{NaCl}; molar mass of NaCl=58.44 g/mol\text{NaCl} = 58.44\,\text{g/mol})

Solution

  1. 1
    Use the mole ratio from the balanced equation: 11 mol Cl2\text{Cl}_2 produces 22 mol NaCl\text{NaCl}, so 0.500.50 mol Cl2\text{Cl}_2 produces 1.001.00 mol NaCl\text{NaCl}.
  2. 2
    Convert product moles to mass: 1.00×58.44=58.4 g1.00 \times 58.44 = 58.4\,\text{g}.

Answer

58.4 g of NaCl58.4\,\text{g of } \text{NaCl}
Stoichiometry uses the coefficients in a balanced equation as mole ratios. Once the product moles are known, convert to grams with the molar mass.

About Stoichiometry

The branch of chemistry that uses balanced chemical equations and mole ratios to calculate the precise quantities of reactants consumed and products formed in chemical.

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More Stoichiometry Examples

Example 1 medium

How many grams of [formula] are needed to completely burn [formula] g of [formula]? ([formula])

Example 2 hard

How many grams of [formula] can be produced from [formula] g of [formula] and excess [formula]? ([fo

Example 3 medium

How many moles of [formula] are produced when [formula] mol of [formula] reacts with excess [formula

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