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serg [7]
3 years ago
14

During alpha emission, the mass number is reduced by ________ and the atomic number is decreased by ________.

Chemistry
1 answer:
trasher [3.6K]3 years ago
4 0
The mass number is reduced by 4 and the atomic number decreases by 2 (because the atom loses 2 protons and 2 neutrons)
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\boxed{\text{62.1 kJ}}

Explanation:

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\Delta_{\text{r}}H^{\circ} = \sum \Delta_{\text{f}} H^{\circ} (\text{products}) - \sum\Delta_{\text{f}}H^{\circ} (\text{reactants})

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\begin{array}{rcl}\Delta_{\text{r}}H^{\circ} & = & [-939.7 + 4(-92.307)] - [-763.2 + 2(-241.828)\\& = & [-939.7 - 369.228] - [-763.2 - 483.656]\\& = & -1308.928 + 1246.856\\& = & \mathbf{-62.1}\\\end{array}\\\text{The amount of heat evolved is } \boxed{\textbf{62.1 kJ}}

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