If 5 moles of Cl_2 react completely with excess Na according to the equation 2 Na + Cl_2 → 2 NaCl, how many moles of NaCl are produced?

• A. 10 moles
• B. 2.5 moles
• C. 20 moles
• D. 5 moles

Answer: (A)

Verified step by step guidance

1. Identify the balanced chemical equation: \$2\ Na + Cl_2 \rightarrow 2\ NaCl$. This tells us the mole ratio between reactants and products.
2. Determine the mole ratio between \(Cl_2\) and \(NaCl\) from the balanced equation. For every 1 mole of \(Cl_2\), 2 moles of \(NaCl\) are produced.
3. Given that 5 moles of \(Cl_2\) react completely, use the mole ratio to find the moles of \(NaCl\) produced by multiplying 5 moles of \(Cl_2\) by the ratio \(\frac{2\ moles\ NaCl}{1\ mole\ Cl_2}\).
4. Set up the calculation: \$5\ moles\ Cl_2 \times \frac{2\ moles\ NaCl}{1\ mole\ Cl_2}\( to find the moles of \)NaCl$ produced.
5. Perform the multiplication to find the number of moles of \(NaCl\) produced (do not calculate the final number here, just set up the expression).