Answer:
Molecular formula = C₅H₁₀O₄
Explanation:
Given data:
Percentage of hydrogen = 7.52%
Percentage of carbon = 44.77%
Percentage of oxygen = 47.71%
Molecular formula = ?
Solution:
Number of gram atoms of H = 7.52 / 1.01 = 7.445
Number of gram atoms of O = 47.71 / 16 = 2.982
Number of gram atoms of C = 44.77/ 12 = 3.731
Atomic ratio:
C : H : O
3.731/2.982 : 7.445/2.982 : 2.982/2.982
1.25 : 2.5 : 1
C : H : O = 1.25 : 2.5 : 1
C : H : O = 4(1.25 : 2.5 : 1 )
Empirical formula is C₅H₁₀O₄
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 5×12 + 10×1.01 + 4×16 = 134.1
n = 134.13/ 134.1
n = 1
Molecular formula = n (empirical formula)
Molecular formula = 1 (C₅H₁₀O₄)
Molecular formula = C₅H₁₀O₄
