Question

which of the following is the correct way to describe the ratio of particles of the substances in the chemical equation? 2na(s) + cl₂(g) → 2nacl(s) 2 molecules na : 1 formula unit cl₂ : 3 moles nacl 1 atom na : 2 molecules cl₂ : 1 formula unit nacl 1 mole na : 2 moles cl₂ : 1 mole nacl 2 atoms na : 1 molecule cl₂ : 2 formula units nacl

Explanation:

Step1: Analyze the chemical equation coefficients

The given chemical equation is \(2Na(s)+Cl_{2}(g)\to2NaCl(s)\). The coefficients in a chemical equation represent the number of particles (atoms, molecules, formula units). For \(Na\), the coefficient is \(2\) (so \(2\) atoms of \(Na\)), for \(Cl_{2}\) the coefficient is \(1\) (so \(1\) molecule of \(Cl_{2}\)), and for \(NaCl\) the coefficient is \(2\) (so \(2\) formula units of \(NaCl\)).

Step2: Check each option

• Option 1: \(2\) molecules \(Na\) is wrong ( \(Na\) is an atom, not a molecule in this context), and \(3\) moles \(NaCl\) is wrong (coefficient is \(2\)).
• Option 2: Coefficients are \(2:1:2\) ( \(Na:Cl_{2}:NaCl\)), not \(1:2:1\).
• Option 3: Coefficients are \(2:1:2\) ( \(Na:Cl_{2}:NaCl\)), not \(1:2:1\).
• Option 4: Matches the coefficient ratio \(2\) atoms \(Na:1\) molecule \(Cl_{2}:2\) formula units \(NaCl\).

Answer:

2 atoms Na : 1 molecule \(Cl_{2}\) : 2 formula units NaCl