Which of the following statements is NOT true? Delta Hr times n is the heat of r

Question

Which of the following statements is NOT true? Delta Hr times n is the heat of reaction. An exothermic reaction gives off heat to the surroundings. Enthalpy is the sum of a system's internal energy and the product of pressure and volume. Delta Er times n is a measure of heat. A piece of iron with a mass of 17.0 g at 348 K is placed in a styrofoam coffee cup with 25.0 ml_of water at 277 K. If you assume that no heat is lost to the cup or the surroundings, what is the final temperature of the water? (specific heat capacity of iron = 0.449 J/g degree C; water = 4.18 J/g degree C)

Explanation / Answer

33) DErxn is a measure of heat.

34) heat lost by iron = heat gained by water

m*s*DT = m*s*DT

17*0.449*(348-x) = 25*4.18*(x-277)

x = 281.83 K = final temperature

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