Atoms of what two elements are in every organic compound?
a. calcium and helium
b. carbon and oxygen
c. cobalt and hydrogen
d. carbon and hydrogen

d. carbon and hydrogen

Explanation:

Hello,

In organic chemistry, it is said that the main atom, it means the atom that must be present in all the compounds classified as organic, is the carbon due to its straightforwardness to form very stable compounds in addition to the presence of hydrogen because all the organic compounds have at least one hydrogen in their structure. Remember that in organic chemistry there are aliphatic and aromatic hydrocarbons, alcohols, ketones, aldehydes, carboxylic acids, anhydrides and others and all of them have carbon and hydrogen in common.

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- lead + phosphoric acid = hydrogen + lead(ii) phosphate

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.