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kherson [118]
3 years ago
10

32p is a radioactive isotope with a half-life of 14.3 days. if you currently have 38.1 g of 32p, how much 32p was present 9.00 d

ays ago?
Chemistry
1 answer:
AleksandrR [38]3 years ago
3 0
T=14.3 d
m₁=38.1 g
t=9.00 d
m₂-?

m₂=2m₁·e^[-(T-t)ln2/T]

m₂=2·38.1·e^[-(14.3-9)ln2/14.3]=58.94 g
58.94 g ³²P was present 9.00 days ago
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An insulated tank contains air at 0.5 atm pressure and 298K. The outside pressure is at 1 atm pressure and 298K. A valve is open
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Answer:

The temperature of the gas after it is filled is 596 K

Explanation:

According to Gay-Lussac law, the pressure of a gas mass is directly proportional to temperature to a constant volume. That means than if pressure rise, the temperature too. We can assume then the volume is constant because the tank is isolated. The tank will be full when pressure will be in equilibrium, that means when pressure will be 1 atm because it is environment pressure. Using the following equation:

P1 /T1 = P2 /T2 and replacing, T2 = P2  *T1 / P1 = 1 atm * 298K / 0.5 atm = 596 K.

I hope my answer helps you

4 0
3 years ago
What are some potential barriers of cleaning bleach?
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6 0
3 years ago
What are the disadvantages of the long form periodic table?
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7 0
3 years ago
Oxycodone (C18H21NO4), a narcotic analgesic, is a weak base with pKb = 5.47. Calculate the pH of a .00250 M oxycodone solution.
Montano1993 [528]

Answer: The pH of a 0.00250 M oxycodone solution is 9.96

Explanation:

C_{18}H_{21}NO_4\rightarrow C_{18}H_{20}NO_3^++OH^-

 cM                     0  M         0 M

c-c\alpha        c\alpha         c\times \alpha

So dissociation constant will be:

K_b=\frac{(c\alpha)^{2}}{c-c\alpha}

Give c= 0.00250 M and pK_b = 5.47

pK_b=-log(K_b)

K_b=3.38\times 10^{-6}

Putting in the values we get:

3.38\times 10^{-6}=\frac{(0.00250\times \alpha)^2}{(0.00250-0.00250\times \alpha)}

(\alpha)=0.036

[OH^-]=c\times \alpha

[OH^-]=0.00250\times 0.0369=9\times 10^{-5}

Also pOH=-log[OH^-]

pOH=-log[9\times 10^{-5}]=4.04

pH+pOH=14

pH=14-404=9.96

Thus pH of a 0.00250 M oxycodone solution is 9.96

5 0
3 years ago
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