Benzene has the empirical formula and an empirical formula weight of 13.0 amu. If the molecular weight is 78.0 amu, what is the molecular formula? (Enter the elements in the order: C, H.)

Molecular formula for benzene is C₆H₆

Explanation:

Benzene has this empirical formula → CH

Empirical weight = 13 amu

12 amu from C + 1 amu from H = 13 amu

To determine the molecular formula we can think this equation:

12 amu X, from C + 1 amu X from H = 78 amu

13 amu X = 78 amu

X = 78 amu / 13 amu = 6 → Molecular formula for benzene is C₆H₆

The empirical formula indicates what proportion of atoms there is for a given compound. Sometimes it can match the molecular formula of the compound

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.