Use the standard enthalpies of formation for the reactants and products to solve for the ΔH rxn for the following reaction. (The ΔH f of C 2 H 4 is 52.26 kJ/mol, CO 2 is -393.509 kJ/mol, and H 2 O is -241.818 kJ.) C 2 H 4 (g) + 3O 2 (g) 2CO 2 (g) + 2H 2 O(g)

ΔH rxn =
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The reaction is
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.

a) the particles of the chair are strongly held together.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.