Let us consider the reaction: C2H6 + O2H2O + CO2(unbalanced)
What is the percentage yield if 30.0 grams of C2H6(with excess oxygen) yields 30.7 grams of water?
How many grams of water can be theoretically formed?

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.