4 years ago

How many atoms are there in 2.59 mol of carbon monoxide (CO)?

1 answer:

7 0

A mole of matter is 6.022*10^23 molecules. And there are 3 atoms in a CO2 molecule (one carbon atom and two oxygen atoms).

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Answer:

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3 years ago

How many molecules are in 8.2 moles of CO3

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I believe the answer is 50.5 molecules

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3 years ago

If a radioactive isotope has a half-life of 26.5 days, how many days does it take for a sample of the isotope to decrease by 35.

dangina [55]

Answer:

16.5 days

Explanation:

Given that:

Half life = 26.5 days

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

Where, k is rate constant

So,

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

$k=\frac {ln\ 2}{26.5}\ days^{-1}$

The rate constant, k = 0.02616 days⁻¹

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

Given:

35.0 % is decomposed which means that 0.35 of $[A_0]$ is decomposed. So,

$\frac {[A_t]}{[A_0]}$ = 1 - 0.35 = 0.65

t = 7.8 min

$\frac {[A_t]}{[A_0]}=e^{-k\times t}$

$0.65=e^{-0.02616\times t}$

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3 years ago

Which statement about caves and polluted groundwater is true? A. Cave rock neutralizes the pollutants in the groundwater. B. Wel

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Cave rock neutralizes pollutants in groundwater.

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3 years ago

Please answer correctly !!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!!!

igomit [66]

Answer:

it is a

Explanation:

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3 years ago

Read 2 more answers