Calculate the number of representative particles in 11.5 molecules of kbr

            The number of representative particles in 11.5 moles of potassium bromide are 6.92 × 10²⁴ formula units of KBr.

Solution:
             As we know that 1 mole of any substance exacly contains 6.022 × 10²³ particles. Mathematically;

             Moles  =  Number of Particles ÷ 6.022 × 10²³

Solving for Number of Particles,

             Number of Particles  =  Moles × 6.022 × 10²³

Putting values,

             Number of particles  =  11.5 mol × 6.022 × 10²³ particles.mol⁻¹

             Number of Particles  =  6.92 × 10²⁴ formula units of KBr

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

Particle exchange energy though elastic collision , hope this .