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solong [7]
3 years ago
10

what percent of a sample of a radioactive element whose half life=5.0 years will decay after 25 years?

Chemistry
1 answer:
Sholpan [36]3 years ago
4 0

Answer:

Calculate the rate of decay constant for U-238 if its half-life is 4.468 × 109 years. Answer: If the problem is referring to the half-life, then the ratio of = 0.5 because half of the original sample has already undergone decay.

Explanation:

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How many moles are there in 2.00 x 1023 molecules of LiOH?​
Tanya [424]

Answer:

Moles de LiOH= 0.33212 Moles

Explanation:

1 Mol of LiOH -->6.022*10^23 molecules of LiOH

therefore

2*10^{23}~molecules ~of~LiOH=\frac{2*10^{23}}{6.02*10^{23}}Moles~of#LiOH

5 0
3 years ago
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andrezito [222]

Answer:

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Explanation:

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What mass of water is produced from the complete combustion of 4.70×10−3 g of methane?
otez555 [7]
Since the equation is balanced we can use the molar ratios to jump between amounts of substances. 
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1.You can use a molar ratio to convert between mols methane to mols CO2: 
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2. You can do the same technique with the water. 
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3. You can do the same technique with the O2. 
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8 0
4 years ago
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1. Which statement describes the properties of both elements that have just one valence electron and elements that have seven va
FromTheMoon [43]
Q1. They are highly reactive. Q2. High reactivity, nonmetallic. Q3. Oxygen has an ion charge of -2. Q4. LiCl I believe. Q5. How electrons are shared. Q6 1. Q7. Share 2 valence electrons, I believe.
3 0
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Example for Conceptual
Vedmedyk [2.9K]

Answer:

The definition of conceptual is something having to do with the mind, or with mental concepts or philosophical or imaginary ideas. An example of conceptual is when you formulate an abstract philosophy to explain the world which cannot be proven or seen. "Conceptual."

Explanation:

7 0
4 years ago
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