What is the molarity of a solution in which 6.9mol of potassium chloride
(KCI) is dissolved in water to a final
volume of 1.8L?

3.83 mol/ L

Explanation:

Molarity is the amount of moles of a substance in a liter of solution.

1.8L 6.9 mol of KCl

1L 6.9 ÷1.8= 3.83 moles of KCl (3 s.f.)

Thus the molarity is 3.83 mol/L.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.