A certain village famine, the government decided to give households each member apotato to avoid hunger. Each box contains an equal number of 6 potatoes. They are 12 households in the village who members are 2, 3, 4, 5, 7, 8, 9, 11, 12 and 10. To determine the number of box of potatoes the government will give to the village. Are there any remaining potatoes? If yes, advise what the government can do with them.

Step 1: Molecular formula of benzene is C_6H_6. M = 6 × 12 + 6 × 1 = 72 + 6 = 78~g/mol Step 2: Mass of carbon in benzene. 6 × 12 = 72~g Step 3: Percentage of carbon. (72)/(78) × 100\% First, simplify fraction: (72 ÷ 6)/(78 ÷ 6) = (12)/(13) Then, (12)/(13) ≈ 0.9231 0.9231 × 100\% = 92.31\% Step 4: Percentage of hydrogen. 6 × 1 = 6~g (6)/(78) × 100\% = 7.69\% Step 5: Reason for sooty flame. Benzene has high carbon content (92.31\%). Oxygen is insufficient for complete combustion to CO2 and H2O, so unburnt carbon forms soot (black smoke). 92.31\%~C,~7.69\%~H