Calculate the molecular mass of carbon monoxide (co) by adding the atomic mass of carbon (c) and the atomic mass of oxygen (o): *

 The   molecular   mass  of carbon monoxide (CO)  is  28 g/mol

   calculation

The  molecular  mass  of CO =  atomic mass  of C + atomic  mass  of O

From  periodic table the atomic  mass  of  C = 12 g/mol and for O = 16 g/mol

Therefore the molecular  mass   of Co = 12 g/mol + 16 g/mol = 28 g/mol

the answer would be a

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!

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~ trueboss72