From calculations of moles, C moles - 0.317 H moles - 0.826, O moles - 0.413 fin

Question

From calculations of moles, C moles - 0.317 H moles - 0.826, O moles - 0.413

find the simpliest whole number mole ratio of C, H, and O. and enter this empirical formular for the sample, using just 5 characters such as, C2H30, C3H20, etc.

Compare the moles of C, moles of H and moles of O and determine which value is the smallest. Now take the moles of each atom (C, H, and O) and divide each by the smallest value. The whole number that you get for each atom will give you the empirical formula for the sample.

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Does the calculated result give the correct empirical formula for the sample?

Pick 1-

A- The molecular fornula of the sample is C5H4 (OH)2 and this is also the empirical formula

B- The molecular formula of the sample is C5H4 (OH)2 and this gives an empirical formula of C3H30

C- The molecular formula of the sample is C5H4 (OH)2 and this gives an empiricial formula of C3H20

D- The molecular formula of the sample is C5H4 (OH)2 but the empirical formula cannot be determined from this information.

Explanation / Answer

C = 0.317 moles

H = 0.826 moles

O = 0.413 moles

Divide by smallest factor,

C = 0.317/0.317 = 1

H = 0.826/0.317 = 2.5

O = 0.413/0.317 = 1.3

the empirical formula thus becomes,

C2H5

The calculated result does not give correct empirical formula for the sample

D- The molecular formula of the sample is C5H4 (OH)2 but the empirical formula cannot be determined from this information.

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