3 years ago

I Need help ASAP

Chemistry

1 answer:

Ksenya-84 [330]3 years ago

5 0

Answer:

242X

I HOPE I'M CORRECT THANKS

You might be interested in

Why a common measuring system is important

Gekata [30.6K]

So scientist around the world can share there info without having to convert and doing extra work.

6 0

3 years ago

If 12.5 grams of the original sample of cesium-137 remained after 90.6 years, what was the mass of the original sample?

myrzilka [38]

Answer:

Mass of original sample = 100 g

Explanation:

Half life of cesium-137 = 30.17 years

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac{\ln2}{t_{1/2}}$

$k=\frac{\ln2}{30.17}\ year^{-1}$

The rate constant, k = 0.02297 year⁻¹

Time = 90.6 years

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

Initial concentration $[A_0]$ = ?

Final concentration $[A_t]$ = 12.5 grams

Applying in the above equation, we get that:-

$12.5\ g=[A_0]e^{-0.02297\times 90.6}$

$[A_0]=\frac{12.5}{e^{-0.02297\times 90.6}}\ g=100\ g$

<u>Mass of original sample = 100 g</u>

8 0

3 years ago

Someone help please , I’ll give brain . Question 10 !

Rudik [331]

Answer:it’s c

Explanation:

I just know it is

4 0

3 years ago

An adiabatic Turbine has R-134a as the working fluid. The inlet has a pressure of 200 kPa and a temperature of 20°C while the ou

Reptile [31]

Hey there!:

Detailed solution is shown below ask if any doubt :

3 0

3 years ago

HELP ASAP <br><br>GIVING BRIANALST TO THE FRIST TO ANSWER

Kisachek [45]

Answer:

yes the ones u chose are correct.

Explanation:

8 0

3 years ago