Attempt 4 a 5.60 mol sample of solid a was placed in a sealed 1.00 l container and allowed to decompose into gaseous b and c. the concentration of b steadily increased until it reached 1.10 m, where it remained constant. a(s)↽−−⇀b(g)+c(g) then, the container volume was doubled and equilibrium was re‑established. how many moles of a remain?

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

the correct answer to this question is 2

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.