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Multiple Choice
Consider the unbalanced equation: Na + Cl₂ → NaCl. What mass of NaCl can be produced from 25.0g of Cl₂ and excess Na? Solve using dimensional analysis.
A
58.5 g
B
50.0 g
C
25.0 g
D
41.0 g
Verified step by step guidance
1
Start by balancing the chemical equation: Na + Cl₂ → NaCl. The balanced equation is 2Na + Cl₂ → 2NaCl.
Identify the molar masses of the substances involved. The molar mass of Cl₂ is approximately 70.9 g/mol, and the molar mass of NaCl is approximately 58.5 g/mol.
Convert the given mass of Cl₂ to moles using its molar mass. Use the formula: \( \text{moles of Cl}_2 = \frac{\text{mass of Cl}_2}{\text{molar mass of Cl}_2} \).
Use the stoichiometry of the balanced equation to find the moles of NaCl produced. According to the equation, 1 mole of Cl₂ produces 2 moles of NaCl.
Convert the moles of NaCl to grams using its molar mass. Use the formula: \( \text{mass of NaCl} = \text{moles of NaCl} \times \text{molar mass of NaCl} \).