When solving a mass to mole problem, what is the first thing you do after balancing the equation? A) multiply by the molar mass of the known

B) multiply by the molar mass of the unknown

C) divide by the molar mass of the known

D) divide by the molar mass of the unknown

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

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.