The table shows the chemical formulas for four substances. c8h18https://staarbank. schoolobjects. com/eduphoria_webcontrols/tests/Tes tImage. aspx?bnk=staarbank&aid=9b51137e -2d09-457a-bd71-6bc1f7bd5bb8&mo de=edit
Which substances have the same number of carbon atoms?
A. Substances 1 and 2
B. Substances 1 and 3
C. Substances 2, 3, and 4
D. Substances 2 and 3 only

Using this reversible reaction, answer the questions below: n2o4 2no2 (colorless) (reddish-brown) -as the temperature increased, what happened to the n2o4 concentration? -was the formation of reactants or products favored by the addition of heat? -which reaction is exothermic? right to left or left to right? -if the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct? n2o4 2no2 + 14 kcal n2o4 2no2, hr = +14 kcal n2o4 + 14 kcal 2no2 n2o4 2no2, hr = -14 kcal