HELP ME!! If a water molecule (H20) has two hydrogen atoms and one oxygen atom, how would you describe the make-up of a carbon dioxide molecule (C02)?

1 carbon atom, 1 oxygen atom

1 carbon atom, 2 oxygen atoms

2 carbon atoms, 2 oxygen atoms

2 carbon atoms, 1 oxygen atom

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

0.88m hope i am correct : )

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.