Four different water samples have the same alkalinity of 2.5 mm and ph of 7.
calculate the [co2], [hco3-], [co32-], and [oh-] for each of the 4 samples respectively.
correctly match the following answers for each of the sample concentrations from the following options:
a) 0
b) 2.5 millimoles/l
c) 1.8 millimoles/l
d) 7.2 millimoles/l

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72