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1. What is the mass of 7.200 × 1025 formula units of salt (NaCl)?

Question

  1. What is the mass of 7.200 × 1025 formula units of salt (NaCl)?
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Solution

To answer this question, we need to follow these steps:

  1. Determine the molar mass of NaCl. The atomic mass of Na (Sodium) is approximately 23 g/mol and the atomic mass of Cl (Chlorine) is approximately 35.5 g/mol. So, the molar mass of NaCl is 23 g/mol + 35.5 g/mol = 58.5 g/mol.

  2. Convert the number of formula units to moles. We know that one mole of any substance contains Avogadro's number (6.022 x 10^23) of formula units. So, 7.200 x 10^25 formula units of NaCl is (7.200 x 10^25) / (6.022 x 10^23) = 1196.27 moles.

  3. Finally, calculate the mass. The mass of the substance in grams is the number of moles times the molar mass. So, the mass of 7.200 x 10^25 formula units of NaCl is 1196.27 moles * 58.5 g/mol = 69991.58 g or approximately 70 kg.

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