Which of the following is a property of carbon atoms? O They are chemically inert.
They have six valence electrons.
They readily give up two electrons.
They are found in all living things.

They give up two electrons.

Explanation:

Thiugh carbon atoms have four valency electrons, the stable oxidation state of carbon is +2 hence it gives up only two electrons in bonding situation for stability

answer: mole of the gas

answer: mole of the gasexplanation:

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.