A student performs an experiment by placing aluminum foil into a solution of copper chloride. In this reaction, 54 grams of aluminum should produce 108 grams of copper. After the reaction was finished, 150 grams of copper had been produced. What was the percent yield?

the volume increases

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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.