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6

Explanation:

Subscript are written at the bottom right side of the symbol of atoms. In given reaction we can see carbon subscript is 6 on right side of chemical equation.

C₆H₁₄

C = 6

Chemical equation:

C₆H₁₄(g) + O₂(g)  →   CO₂(g) + H₂O(g)

Balance chemical equation:

2C₆H₁₄(g) + 19O₂(g)  →   12CO₂(g) + 14H₂O(g)

The given reaction is burning of hexane. When hexane burn in the presence of oxygen it produced carbon dioxide and water.

The reaction also follow the law of conservation of mass. There are equal number of atoms of each element on both side of equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.