The table shows the thermodynamic data for a reaction. Thermodynamic Data Energy of the Reactants Energy of the Products Activat
ion Energy 160 kJ 370 kJ 260 kJ Which of the following statements explains if the reaction is endothermic or exothermic? The activation energy is lower than the change in enthalpy, so it is an exothermic reaction. The activation energy is higher than the change in enthalpy, so it is an endothermic reaction. The change in enthalpy is −210 kJ, so it is an exothermic reaction. The change in enthalpy is +210 kJ, so it is an endothermic reaction.
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= 24.3
The average atomic mass of X is the <em>weighted average</em> of the atomic masses of its isotopes.
We multiply the atomic mass of each isotope by a number representing its <em>relative importance</em> (i.e., its % abundance).
Thus,
0.790 × 24 u = 18.96 u
0.100 × 25 u = 2.50 u
0.110 × 26 u = <u>2.86 u</u>
TOTAL = 24.3 u
∴ The relative atomic mass of X is 24.3.