How many total "elements" are in the chemical equation? H2 + O2 + H2 → H2O + H2O

1
6
12
2

Use the standard enthalpies of formation for the reactants and products to solve for the δhrxn for the following reaction. (the δhf of c2h4 is 52.26 kj/mol, co2 is -393.509 kj/mol, and h2o is -241.818 kj.) c2h4 (g) + 3o2(g) 2co2 (g) + 2h2o(g) δhrxn = the reaction is .

In one or two grammatically correct sentences, write a definition for the term molecule geometry

Salt in oceans comes from and of rocks