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VladimirAG [237]
3 years ago
13

PLEASE HELP ASAP I EILL GIVE 100 POINTS!!! Kristy is on the track team. She runs the one kilometer race by going four times arou

nd the circular track. How does Kristy velocity change.
A. Her velocity changes countinually since her direction constantly changes
B. Her velocity depends on only on how she paces herself during the race
C. Her velocity is the same as her speed
D. Her speed changes at the same rate as velocity
Chemistry
1 answer:
qaws [65]3 years ago
5 0

Answer:A

Explanation:

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Answer:

0.6749 M is the concentration of B after 50 minutes.

Explanation:

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Half life of the reaction = t_{1/2}=25 minutes

Rate constant of the reaction = k

For first order reaction, half life and half life are related by:

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{25 min}=0.02772 min^{-1}

Initial concentration of A = [A]_o=0.900 M

Final concentration of A after 50 minutes = [A]=?

t = 50 minute

[A]=[A]_o\times e^{-kt}

[A]=0.900 M\times e^{-0.02772 min^{-1}\times 50 minutes}

[A] = 0.2251 M

The concentration of A after 50 minutes = 0.2251 M

The concentration of B after 50 minutes = 0.900 M - 0.2251 M = 0.6749 M

0.6749 M is the concentration of B after 50 minutes.

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