Q37 / 160 · AP EAMCET 2020 (18 Sep Shift 2) · Chemistry

Which of the following is true about sodium chloride?

  • A
    Molecular mass \(=58.5 \mathrm{amu}\)
  • Correct answer
    B
    Formula mass \(=58.5 \mathrm{amu}\)
  • C
    Molecular mass \(=5.85 \mathrm{amu}\)
  • D
    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 \(=(23+35.5)=58.5 \mathrm{amu}\)

Hence, the correct answer is option: 'B'.

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