3. Vanillin is the main component of vanilla flavorings. It percentage compositi

Question

3. Vanillin is the main component of vanilla flavorings. It percentage composition is 63.2% carbon, 5.26% hydrogen, and 31.6% oxygen. What is its empirical formula? The empirical formula of p-xylene is C4Hs; the molar mass of p-xylene is 106g/mole. What is the molecular formula for p-xylene? What is the total number of atoms present in a 20.00g sample of this substance? The plastic pipe used for most of the water and sewer lines is made of a polymer called PVC. The compound used to synthesize PVC has a general formula CxHyE This substance is composed of 38.4% C and 4.8% H. What is the identity of element E? What is the empirical formula of this compound? 4. 5.

Explanation / Answer

3.

Element   Mass    Number of moles      Division by small number    Nearest whole number

C               63.2    63.2 / 12 = 5.27             5.27 / 1.975 = 2.67          2.67 * 3 = 8.00

H                5.26    5.26 / 1 = 5.26             5.26 / 1.975 = 2.67           2.67 * 3 = 8.00

O              31.6     31.6 / 16 = 1.975          1.975 / 1.975 = 1              1 * 3 = 3.00

Therefore,

Emperical formula = C8H8O3

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