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poizon [28]
3 years ago
13

If a concentration had X number of compounds and its concentration was 7 mol/L, if

Chemistry
1 answer:
Andreyy893 years ago
7 0

Answer:I think the answer would be 2 mol/L

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If nitrogen-13 has a half life of 2.5 years, how much remains from a 100g sample after 7.5 years
Sonbull [250]

Answer:

12.50g

Explanation:

T½ = 2.5years

No = 100g

N = ?

Time (T) = 7.5 years

To solve this question, we'll have to find the disintegration constant λ first

T½ = In2 / λ

T½ = 0.693 / λ

λ = 0.693 / 2.5

λ = 0.2772

In(N/No) = -λt

N = No* e^-λt

N = 100 * e^-(0.2772*7.5)

N = 100*e^-2.079

N = 100 * 0.125

N = 12.50g

The sample remaining after 7.5 years is 12.50g

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3 years ago
What will be the charge of an atom containing eight protons, nine neutrons, and 10 electrons?
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The charge would be -2 because there are 2 more electrons than protons, and electrons have a negative charge.
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Water that fills the cracks and spaces in underground soil and rock layers is calleda. salt water.
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The answer is groundwater
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Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular the
Dmitriy789 [7]
That they are random, constant, and straight -line motion.
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Which atoms were needed to form the sodium nitrite?
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Answer:

Molecular Formula : NaNO2 or NNaO2 and Molecular Weight:

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Explanation:

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