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JulsSmile [24]
3 years ago
12

Thorium-234 has a half life of about 25 days. What percent of the thorium will remain after 125 days

Chemistry
1 answer:
solong [7]3 years ago
4 0

Answer:

3.125% will remain after 125 days

Explanation:

Given data:

Half life of Th-234 = 25 days

Percent of thorium remain after 125 days = ?

Solution:

Number of half lives = T elapsed / half life

Number of half lives = 125 days / 25 days

Number of half lives = 5

At time zero =100%

At 1st half life = 100%/2 = 50%

At second half life = 50%/2 = 25%

At third half life = 25%/ 2 = 12.5%

At 4th half life = 12.5% /2 = 6.25%

At 5th half life = 6.25% /2 = 3.125%

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telo118 [61]

Answer:

Primero debes usar los gramos de co2 y luego buscar su peso molecular, luego de eso usar la relación de moles entre CO2 y H2O y por último buscar el pm del H2O pata ver cuantos gramos de produce.

Explanation:

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9. For each reaction listed, identify the proton donor (or acid) and the proton acceptor(or base).
Talja [164]

Answer:

Explanation:

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Conjugate acid <> H₃0 +

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Conjugate base <>NO₃⁻

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3 years ago
calcium has atomic number of 20 how many electrons of a calcium atom are involved in chemical bonding
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The answer is 2 electrons.


The electron configuration of calcium is 2:8:8:2

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Calcium is a metal. When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms forming ions. The resulting compound is known  as an ionic compound.

For example, when calcium metal reacts with chlorine gas,   calcium gives up its two valence electrons and Chlorine accepts them resulting in a new substance called calcium chloride in which the two elements have ended up forming ionic bonds.

 


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3 years ago
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2 years ago
Citric acid (right) is concentrated in citrus fruits and plays a central metabolic role in nearly every animal and plant cell.
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<h3>What is citric acid?</h3>

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brainly.com/question/10796161

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