Which of these statements is true of plant cells?

Iknow the answer is a but i don't know why

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Kc = 0.040 for the system below at 450oc. if a reaction is initiated with 0.40 mole of cl2 and 0.40 mole of pcl3 in a 2.0 liter container, what is the equilibrium concentration of cl2 in the same system? pcl5(g) ⇄ pcl3(g) + cl2(g)