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What is the molecular formula of a compound that contains 10.0g carbon, 1.68g hydrogen, and 13.4g oxygen the molar mass of this compound is 180g/mol

Sagot :

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Answer:

CH2O

Explanation:

                       Carbon                      Hydrogen                   Oxygen

mass(g)            10.0                            1.68                            13.4

no. of                10/12 = 0.83333      1.68/1 = 1.68            13.4/16=0.8375

moles  

ratio          0.83333/0.83333=1   1.68/0.8333≈2        0.8375/0.83333≈1

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to find number of moles, divide mass by element's mass number

to find ratio, divide number of moles of each element by the element with the smallest number of moles (in this case, carbon)

ratio will give you empirical/molecular formula, CH2O

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