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The male sex hormone testosterone contains 79.12% C, 9.79% H and the rest is O. Ecah molecule contains two O atoms. What is the molecular formula and molecular weight of testosterone?

Sagot :

Elements - Molecular Mass - Formula Mass- Mole - Mole Ratio
    C              79.12 g                  12.0 g        6.59       10                           
    H                9.79 g                   1.0 g         9.79       14
    O              11.09 g                  16.0 g        0.69         1
Empirical Formula = C₁₀H₁₄O × 2(Because each molecule has two Oxygen atoms) = C₂₀H₂₈O₂
Molecular Formula = C₂₀H₂₈O₂
Formula Weight = (12·10) + (1·14) + (16·1)
                        = 120+14+16
                        = 150 g
Molecular Weight = (12·20) + (2·14) + (16·2)
                          = 240+28+32
                          = 300 g