Which of the following is true about sodium chloride?
Which of the following is true about sodium chloride?
Molecular mass \(=58.5 \mathrm{amu}\)
Formula mass \(=58.5 \mathrm{amu}\)
Molecular mass \(=5.85 \mathrm{amu}\)
Formula mass \(=5.85 \mathrm{amu}\)
Solution
Sodium chloride is an ionic crystal of rock salt structure in which \(4 \mathrm{NaCl}\) units are present in one unit cell of coordination number, \(\mathrm{Na}^{+}: \mathrm{Cl}^{\circ}=6: 6\) So, actual molecule of sodium chloride is not \(\mathrm{NaCl}, \mathrm{NaCl}\) is the molecular formula of formula mass \(=(23+35.5)=58.5 \mathrm{amu}\)