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stira [4]
2 years ago
11

a radioactive isotope of the element potassium decays to produce argon. if the ratio of argon to potassium is found to be 7:1, h

ow many half-lives have occurred? group of answer choices
Chemistry
1 answer:
spayn [35]2 years ago
5 0

3; REVIEWS: If the ratio of argon to potassium atoms is 7:1, three half-lives have elapsed.

<h3>Do potassium's half-lives last a long time?</h3>

For potassium atoms, the image result is 7:1, meaning three half-lives have passed. details

A radioactive potassium isotope with a long half-life of 1.25 billion years is known as potassium-40 (40K). About 0.012% (120 ppm) of the total potassium present in nature is contained in it.

<h3>How much of a sample is still there after three half-lives?</h3>

One eighth (12.5%) of the initial sample is still present after three half-lives. The period of time needed for one-half of a sample to traverse through...

To learn more about ' half-life' refer to

brainly.com/question/8154625

#SPJ4

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What ketones would be formed from the acid-catalyzed hydration of 3-heptyne?
blagie [28]

The answer would be heptan-3-one and heptan-4-one.

The acid-catalyzed hydration of a balanced alkyne gives a ketone.

R-C≡C-R + H₂O → R-CH₂-CO-R

If the alkyne is uneven, you get a combination of two ketones, since the O can increase to either of the alkyne C atoms.

R-C≡C-R' + H₂O → R-CH₂-CO-R' + R-CO-CH₂-R'

So, for CH₃CH₂CH₂-C≡C-CH₂CH₃, the products are

CH₃CH₂CH₂-CH₂-CO-CH₂CH₃ and CH₃CH₂CH₂-CO-CH₂-CH₂CH₃

Their terms are heptan-3-one and heptan-4-one,

6 0
3 years ago
How many moles of sulfur are found in 2.86 * 10^21 atoms of sulfur?
wlad13 [49]

Answer:

4.75x10^{-3}mol

Explanation:

Hello!

In this case, since the Avogadro's number is a large one that help us to figure out 1 mole of any substance contains 6.022x10²³ particles, say atoms, molecules or ions, in this case, for the given amount of atoms of sulfur, the corresponding moles are obtain down below:

2.86x10^{21}atoms*\frac{1mol}{6.022x10^{23}}\\\\4.75x10^{-3}mol

Best regards!

3 0
3 years ago
What would be the new pressure if 250. сm of gas at 25.0°C and 730. mmHg pressure
IrinaVladis [17]

Answer:

2340mmHg

Explanation:

P1V1/n1T1=P2V2/n2T2

n1=n2 T1=25+271=298k

T2=300+273=573k

730×250/298=P2×150/573

P2=2340mmHg

5 0
3 years ago
The size of the chosen symbols on a graph may be used to indicate the:
Tresset [83]
Uncertainty of the data  hope its help you

6 0
3 years ago
Homes may be heated by pumping hot water through radiators. What mass of water will provide the same amount of heat when cooled
dolphi86 [110]

Answer:

mass of water is 7.43 g

Explanation:

q = mc∆T

qsteam = 100 g × 1.864 J/(g °C) × (110 – 100) °C = 1864 J

qwater = mwater× 4.184 J/(g °C) × (95 – 35) °C = mwater× 251.04 J/g = qsteam = 1864 J

mwater = 1864 J / 251.04 J/g = 7.43 g

3 0
3 years ago
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