Which statement about balanced chemical equations is true? O A. The total mass of the reactants equals the total mass of the
products.
B. The mass of the new atoms that are formed equals the mass of
the atoms that made up the reactants.
O C. The mass of the products is greater than the mass of the
reactants when the number of moles increases.
D. The total number of moles of products equals the total number of
moles of reactants.
Thing

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.