117.0g of NaCl have

Explanation

Option A is correct.To calculate the number of formula units of NaCl in 117.0g of NaCl, we can use the following steps: Calculate the number of moles of NaCl in 117.0g of NaCl. Multiply the number of moles of NaCl by Avogadro's number (6.022 x 10^23 atoms/mol) to get the number of formula units of NaCl. Step 1: Calculate the number of moles of NaCl in 117.0g of NaCl. The molar mass of NaCl is 58.5g/mol. This means that 1 mole of NaCl weighs 58.5g. Number of moles of NaCl = mass of NaCl / molar mass of NaCl Number of moles of NaCl = 117.0g / 58.5g/mol Number of moles of NaCl = 2.0 moles Step 2: Multiply the number of moles of NaCl by Avogadro's number to get the number of formula units of NaCl. Number of formula units of NaCl = number of moles of NaCl * Avogadro's number Number of formula units of NaCl = 2.0 moles * 6.022 x 10^23 atoms/mol Number of formula units of NaCl = 1204 x 10^23 formula units Therefore, 117.0g of NaCl have 12.04 x 10^23 formula units of NaCl.