If 6.50 g of the unknown compound contained 0.217 mol of c and 0.433 mol of h , how many moles of oxygen, o , were in the sample?

Answer : The moles of oxygen in the sample was 0.216 mole.

Explanation : Given,

Moles of C = 0.217 mol

Moles of H = 0.433 mol

Mass of unknown compound = 6.50 g

Molar mass of C = 12 g/mol

Molar mass of H = 1 g/mol

Molar mass of O = 16 g/mol

First we have to calculate the mass of C and H.

Now we have to calculate the mass of oxygen.

Mass of oxygen = Mass of unknown compound - [Mass of C + Mass of H]

Mass of oxygen = 6.50 - [2.604 + 0.433]

Mass of oxygen = 3.463 g

Now we have to calculate the moles of oxygen.

Therefore, the moles of oxygen in the sample was 0.216 mole.

what's the question?

explanation:

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