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Nataliya [291]
3 years ago
15

What % of original U238 remains after three half lives? 1-50 2-25 3-12.5 4-6.25

Chemistry
1 answer:
Grace [21]3 years ago
7 0

Answer:

12.5

Explanation:

After three half-lives, one eighth (1/2 x 1/2 x 1/2) of the uranium-238 will remain. One-eighth equals 12.5%

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6 0
3 years ago
The equilibrium constant, Kc, for the reaction N2O4(g)⇌2NO2(g) is 5.0×10−3. If the equilibrium mixture contains [NO2] = 0.050 M
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Answer:

0.50 M is the molar concentration of N_2O_4.

Explanation:

The equilibrium constant of the reaction = K_c=5.0\times 10^{-3}

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[NO_2]=0.050 M

Equilibrium concentration of N_2O_4 = ?

[N_2O_4]= x

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K_c=\frac{[NO_2]^2}{[N_2O_4]}

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0.50 M is the molar concentration of N_2O_4.

4 0
4 years ago
Balance the following DECOMPOSITION chemical reaction:
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