The bolded number in front of the formula is the coefficient. Multiply the coefficient by each element in the formula and determine the correct number of atoms for each element.
3 NaC₂H₂O2
Please help I don’t understand!!

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

27. =3,500,000 x 4,000 = 14,000,000,000

Heating it up with cause a quicker reaction time

Ansa leaf changing color in autumn;