You have the equations:

2H2O(l)→2H2(g)+O2(g), △H=572 kJ

2N2(g)+3H2(g)→2NH3(g), △H=−138 kJ
2NO2(g)+7H2(g)→2NH3(g)+4H2O(l), △H=−1.18×103 kJ 2NO2(g)→2N2(g)+2O2(g), △H=□

What is the missing △H ?

−1.38×103 kJ
+99.0 kJ
+1.38 × 10³ kJ
−138 kJ

they emit helium gas that attaches to nearby planets.

they remove low-mass elements from the planets’ crust.

they cause nuclear fusion inside the inner core of planets.

they produce heavy elements such as iron and gold.

explanation:

b) mutualism

hope this : )

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

the right answer is c i just did the question.