Which of the following laboratory procedures best illustrates the law of conservation of mass? A) Recording the rise in water level when a 25g piece of wood is placed in 200mL of water B) synthesizing 36g of h20 by combining 4g of H2 and 32g of O2
C) Heating 32g of S and 56g of Fe to form 80g of FeS
D) Measuring precisely .495g of sulfur powder

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

bcde is the incorrect answer it is a

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.