Sulfur trioxide, SO3, is commercially produced on a massive scale for use in manufacturing. It is also produced when burning fossil fuels and is an air pollutant involved in the formation of acid rain. Required:
a. Draw one of the valid Lewis electron-dot diagrams for the SO3 molecule. Be sure to include all valence electrons, including lone pairs.
b. Predict the shape of the SO3 molecule based on the diagram

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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.