A student is asked how many moles are in 3 grams of Hydrogen gas. The student answers that there are 3 moles of Hydrogen gas in 3 grams of Hydrogen gas.
Construct a response to each of the following prompts:

Explain why 3 grams does not equal 3 moles

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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.