Final answer:
To find the mass of 6.5 x 10–25 molecules of NaCl, convert the number of molecules to moles using Avogadro's number, then multiply by the molar mass of NaCl. After performing the calculations, round to the nearest hundredths place to get the final answer.
Step-by-step explanation:
To calculate the mass of 6.5 x 10–25 molecules of NaCl, first, we need to determine the number of moles of NaCl that 6.5 x 10–25 molecules represent. Avogadro's number (6.022 x 1023 molecules/mol) is the conversion factor between the number of molecules and moles. Applying the calculations, the number of moles of NaCl is given by: moles = 6.5 x 10–25 molecules / 6.022 x 1023 molecules/mol
Using the formula mass of NaCl (58.44 g/mol), we can convert moles to grams:mass = moles x 58.44 g/mol
After calculating these steps, we round the final mass to the hundredths place to find the closest answer.