Question

How many ions are present in 5.85 gram of sodium chloride?

Answer 1

Mol. wt of NaCl= 23+35.5=58.5 g

58.5 g of Na Cl = 1 mole

5.85 g ofNaCl = 1 X 5.85/58.5 = 0.1 mole

Each molecule of NaCI contains one Na ion and one Cl ion = 2 ions

Total moles of ions in 0.1 mole of NaCI = 2 x 0.1 = 0.2 moles

No. of ions = 0.2 x 6.022 x 1023 = 1.2044 x 10^23 ions