When mgo reacts with h2o at 25 ˚c and 1 atm, the volume change is –4. 6 ml•mol–1. Mgo(s) h2o(l) → mg(oh)2(s) what is the value of ∆h - ∆e for this reaction?.

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b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.