Please Help me please

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.

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.