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notsponge [240]
3 years ago
8

Consider a radioactive sample with a half-life of one week. How much of the original sample will be left at the end of the third

week?
Chemistry
1 answer:
Masteriza [31]3 years ago
7 0
Radioactive always means first order reaction
the half life of a first order reaction is t(1/2)=ln(2)/k. addtional info is needed to complete the calculations but this will determine the rate constant k. then for a first order reaction: <span>ln[A] = ln[Ao] - kt where [A] is the final amount left after time t (3 weeks) and [Ao] is the inital amount. </span>
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What do you understand by the term positron?
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A positron is a subatomic particle with the same mass as an electron and a numerically equal but positive charge.

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Which statement about anaerobic respiration is true? Anaerobic respiration prevents muscle fatigue. Anaerobic respiration genera
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Anaerobic respiration is used commercially in the production of beer, wine, bread, yogurt, and cheese.

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6 0
3 years ago
What is the ph of a 0.45 m solution of aniline (c6h5nh2)? (pkb  9.40)?
mote1985 [20]

Answer is: pH of aniline is 9.13.<span>
Chemical reaction: C</span>₆H₅NH₂(aq)+ H₂O(l) ⇌ C₆H₅NH₃⁺(aq) + OH⁻(aq).

pKb(C₆H₅NH₂) = 9.40.

Kb(C₆H₅NH₂) = 10∧(-9.4) = 4·10⁻¹⁰.

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c(C₆H₅NH₃⁺) = c(OH⁻) = x.

c(C₆H₅NH₂) = 0.45 M - x.

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pH = 14 - 4.87 = 9.13.

7 0
4 years ago
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