Question

. What is the molecular formula of this The empirical formula of a compound is CH,O and its molar mass is 160.21 compound? Select the correct answer below: O CHO OC,H,O, OC,H,O, OC,H,O,

Answer 1

Correct option: C₅H₂₀O₅

Explanation:

Let us say that the molecular formula of the compound = (CH₄O)_n     (where, n is an integer)

Molar mass of C = 12 g/mol

Molar mass of H = 1 g/mol

Molar mass of O = 16 g/mol

Molar mass of the compound from the molecular formula = n x (1 x 12 g/mol + 4 x 1 g/mol + 1 x 16 g/mol)

                                                                                           = 32n g/mol

Actual molar mass of the compound = 160.21 g/mol

Thus,

32n g/mol = 160.21 g/mol

or, n = 5

Hence, the molecular formula of the compound = (CH₄O)_n

                                                                            = (CH₄O)₅

                                                                            = C₅H₂₀O₅