The molecular weight of salicylic acid, \text{C}_7 \text H_{6} \text O_3C 7 H 6 O 3 start text, C, end text, start subscript, 7, end subscript, start text, H, end text, start subscript, 6, end subscript, start text, O, end text, start subscript, 3, end subscript, is 138.12\,\dfrac{\text g}{\text{mol}}138.12 mol g

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

since electrons are negative the answer is neagtaive

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms