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Bezzdna [24]
2 years ago
5

The half-life of tritium (h) is 12 years. How long does it take for 16. 0 ng of tritium to decay to the point where 2. 0 ng rema

ins?
Chemistry
1 answer:
kumpel [21]2 years ago
6 0

Answer:

36 years

Explanation:

2 =  16   *   (1/2)^n          where n is the number of half lives

2/16 = (1/2)^n

1/8 =  (1/2)^n

log (1/8)  = log (1/2^n)

log(1/8) =  n log (1/2)

log ( 1/8 ) / log(1/2) = n = 3  half lives

each half life is 12 years    so  3 * 12 = 36 years      

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Tanya [424]

Answer:

V=23.9mL

Explanation:

Hello!

In this case for the solution you are given, we first use the mass to compute the moles of CuNO3:

n=2.49g*\frac{1mol}{125.55 g}=0.0198mol

Next, knowing that the molarity has units of moles over liters, we can solve for volume as follows:

M=\frac{n}{V}\\\\V=\frac{n}{M}

By plugging in the moles and molarity, we obtain:

V=\frac{0.0198mol}{0.830mol/L}=0.0239L

Which in mL is:

V=0.0239L*\frac{1000mL}{1L}\\\\V=23.9mL

Best regards!

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