Question

30 POINTS

Calculate the number of moles of EACH element (number of moles of Na & number of moles of Cl) in NaCl in the sample. (Use your answer from Part A as your starting point.) Show your work.

Known:
-17.44g (NaCl sample)
-Molar Mass = 58.44 (both)

17.44g NaCl * 1 mol NaCl/58.44g Nacl = 0.298 (mol of NaCl)

Answer 1

Answer: It contains 0.298 mole of Na and 0.298 mole of Cl.

Step-by-step explanation:

• To get the number of moles of each element in NaCl we should know that every mole of NaCl contains 1.0 mole of Na and 1.0 mole of Cl:

NaCl → Na + Cl

• It is clear that each mole of NaCl contains one mole of Na and one mole of Cl.

• Using cross multiplication:

1.0 mol NaCl → 1.0 mol Na

0.298 mol NaCl → ??? mol Na

• The number of moles of Na atoms in NaCl = (1.0 mol Na x 0.298 mol NaCl) / (1.0 mol NaCl) = 0.298 mol of Na atoms.

• By the same way; the number of moles of Cl atoms = (1.0 mol Cl x 0.298 mol NaCl) / (1.0 mol NaCl) = 0.298 mol of Cl atoms.