If the molecular mass of the potassium and oxygen compound in ex. 31 is 94 g/mol, what is the molecular formula for this compound?

Answer is: the molecular formula for this compound is K₂O.

M(KₓOₐ) = 94 g/mol; molecula mass of the unknown compound.

M(KₓOₐ) = x·Ar(K) + a·Ar(O) · g/mol.

94 g/mol = 39·x + 16·a · g/mol.

Only possible solution is x = 2 and a = 1.

94 g/mol = 39 · 2 + 16 · 1 · g/mol.

Ar is relative atomic mass (the ratio of the average mass of atoms of a chemical element to one unified atomic mass unit) of an element .

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explanation:

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each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i