Question

Use the formula to find the number of moles in

2.5 X 10 ^-6 dm³ of a 8.0 X 10 ^-6 moldm^-3 solution of potassium   permanganate.

(a)           Evaluate showing your working out without calculator use:-     

           2.6x10⁷ x 3x10^-4      

                        1.3 x 10³               

Answer 1

(a) $2.5*10^{-6}*8*10^{-6}=20*10^{-12}=2*10^{-11}\; mol.$

(b) $2.6*10^7*3*10^{-4}=7.8*10^3=7800.$

$1.3*10^3=1300.$