Calculate E in kilojoules per mole for the following reaction: ...

[savannahhooper]

Question 1

Calculate the change in energy in kJ/mol for the transmutation of radium from the given molar masses:

Ra

→

He

+

226.0254 g/mol

4.0026 g/mol

222.0176 g/mol

 

◦ –5.2 kJ/mol
◦ –1.6 kJ/mol
◦ –4.7 × 10¹⁴ kJ/mol
◦ –4.7 × 10⁸ kJ/mol
◦ +1.6 × 10⁸ kJ/mol

Question 2

Calculate ΔE in kilojoules per mole for the following reaction:
              Th → He + Ra
Atomic masses: ²³⁰Th = 230.0332, ⁴He = 4.00260, ²²⁶Ra = 226.02544.

◦ –4.6 × 10⁸ kJ/mol
◦ –2.4 × 10⁶ kJ/mol
◦ 0
◦ +2.4 × 10⁶ kJ/mol
◦ +4.6 × 10⁸ kJ/mol

[amandalm]

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[savannahhooper]

Thanks for the timely response, appreciate it

[lcapri7]

Gracias!