The standard enthalpies of formation of ions in aqueous solutions are obtained by arbitrarily assigning a value of zero to h+ ions; that is, δh° [h f ⁺ (aq)] = 0. (a) for the following reaction hcl(g) ⟶h₂o h⁺(aq) + cl⁻(aq) δh° = −74.9 kj/mol calculate δh° for the cl f ⁻ ions. (b) given that δh° for oh f − ions is −229.6 kj/mol, calculate the enthalpy of neutralization when 1 mole of a strong monoprotic acid (such as hcl) is titrated by 1 mole of a strong base (such as koh) at 25°c.

50 pts plz what is the physical state of matter of baking soda.

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?