To find the number of moles in 6.7 grams of NaCl, divide the mass by the molar mass of NaCl to get 0.072 mol NaCl. This amount of NaCl, once dissociated, will yield 0.14 mol ions.
Converting Grams of NaCl to Moles and Ions
To determine how many moles are in 6.7 grams of NaCl (sodium chloride), follow these steps:
Convert from grams to moles of NaCl using the molar mass of NaCl in the unit conversion factor. Given that the molar mass of NaCl is approximately 58.44 g/mol, the calculation is as follows: (6.7 grams NaCl) / (58.44 g/mol) = 0.072 mol NaCl.
Determine the number of moles of ions present in the solution. Since NaCl dissociates into two ions - Na+ and Cl- - for every mole of NaCl, there are 2 moles of ions. Using the number of moles of NaCl calculated in step 1, we have: 0.072 mol NaCl × (2 mol ions/1 mol NaCl) = 0.14 mol ions.
Therefore, 6.7 grams of NaCl equals 0.072 moles of NaCl, which results in 0.14 moles of ions when dissolved.