Precise measurements give the following masses: nuclide 238, 92 234, 90 4 238. 92 U He U mass 238.05079 u Th 234.04360 u 4.00260 u particle on 0 ·le Is energy released or absorbed by this reaction? Now consider the following nuclear reaction: 234 Th + He 90 -4 5.4858 × 10 u mass 1.0086649 u -4 5.4858 × 10 u If you said energy was released or absorbed, calculate how much energy is released or absorbed. Give your answer in both kJ/mol and MeV. Round each of your answers to 3 significant digits. Note: take particular care to keep enough digits in any intermediate calculation, and use enough digits in any scientific constants you need, since the data with which you are working are very precise. O released absorbed neither released nor absorbed O I need more information to decide. ☐kJ/mol MeV

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**Precise measurements give the following masses:**

| nuclide       | mass        |
|---------------|-------------|
| \(_{92}^{238}\text{U}\) | 238.05079 u  |
| \(_{90}^{234}\text{Th}\) | 234.04360 u  |
| \(_{2}^{4}\text{He}\)   | 4.00260 u    |

| particle       | mass              |
|----------------|-------------------|
| \(_0^1\text{n}\) | 1.0086649 u       |
| \(_{-1}^0\text{e}\) | \(5.4858 \times 10^{-4}\) u |
| \(_1^0\text{e}\)  | \(5.4858 \times 10^{-4}\) u |

**Now consider the following nuclear reaction:**

\[
_{92}^{238}\text{U} \rightarrow _{90}^{234}\text{Th} + _{2}^{4}\text{He}
\]

**Is energy released or absorbed by this reaction?**

- ☐ released
- ☐ absorbed
- ☐ neither released nor absorbed
- ☐ I need more information to decide.

**If you said energy was released or absorbed, calculate how much energy is released or absorbed.**

Give your answer in both kJ/mol and MeV. Round each of your answers to **3 significant digits**.

*Note:* take particular care to keep enough digits in any intermediate calculation, and use enough digits in any scientific constants you need, since the data with which you are working are very precise.

☐ kJ/mol

☐ MeV
Transcribed Image Text:**Precise measurements give the following masses:** | nuclide | mass | |---------------|-------------| | \(_{92}^{238}\text{U}\) | 238.05079 u | | \(_{90}^{234}\text{Th}\) | 234.04360 u | | \(_{2}^{4}\text{He}\) | 4.00260 u | | particle | mass | |----------------|-------------------| | \(_0^1\text{n}\) | 1.0086649 u | | \(_{-1}^0\text{e}\) | \(5.4858 \times 10^{-4}\) u | | \(_1^0\text{e}\) | \(5.4858 \times 10^{-4}\) u | **Now consider the following nuclear reaction:** \[ _{92}^{238}\text{U} \rightarrow _{90}^{234}\text{Th} + _{2}^{4}\text{He} \] **Is energy released or absorbed by this reaction?** - ☐ released - ☐ absorbed - ☐ neither released nor absorbed - ☐ I need more information to decide. **If you said energy was released or absorbed, calculate how much energy is released or absorbed.** Give your answer in both kJ/mol and MeV. Round each of your answers to **3 significant digits**. *Note:* take particular care to keep enough digits in any intermediate calculation, and use enough digits in any scientific constants you need, since the data with which you are working are very precise. ☐ kJ/mol ☐ MeV
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