The conservation of matter can be demonstrated by using chemical equations. Which chemical equation demonstrates the conservation of matter? A 2Sn + 4HNO3 → SnO2 + 4NO2 + H2O
B l2 + 5Cl2 + 6H2O + 2HIO3 + 10HCI
с Cl + 4Na + 4NaCl
D 4P + 5HNO3 → 5NO + 3H3PO4​

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.