Question

How many molecules are in 2.5 mol of NaCl?

(a) 1.51×10^24
(b) 146
(c) 1.51×10^23
(d) 4.15​

Answer 1

1.51 x 10²⁴molecules

Step-by-step explanation:

Given parameters:

Number of moles of NaCl = 2.5moles

Unknown:

Number of molecules = ?

Solution:

The number of molecules that can be found in a given mole is given as the Avogadro's constant;

1 mole of substance = 6.02 x 10²³ molecules

2.5 mole of NaCl = 2.5 x 6.02 x 10²³ molecules

= 1.51 x 10²⁴molecules