Question

How many molecules of NaCl are in 2.45g of NaCl?

Answer 1

Answer:

6.023*10^23 atoms of Na = 1 mol of Na. 6.023*10^23 atoms of Cl = 1 mol of Cl. 6.023*10^23 molecules of NaCl = 1 mol of NaCl.

Answer 2

Given:

The mass of NaCl = 2.45 gm

To Find:

The no molecules of NaCl in the given amount.

Calculation:

- The molar mass of NaCl = 58.5 gm/mol

- No of moles of NaCl = 2.45/58.5 = 0.0419

- No of molecules = 0.0419 × 6.022 × 10²³

⇒ n = 0.2523 × 10²³

⇒ n = 2.523 × 10²²

- So, the no of molecules of NaCl in 2.45 gm is 2.523 × 10²².