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3 years ago

14

What is the percent of carbon-14 remaining after two half-lives?

1 answer:

Maslowich3 years ago

7 0

After one half-life, one half is remaining. After two half-lives one fourth is remaining. So that would be 25%

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Electron configurations can be represented in an abbreviated form also known as the Noble Gas configuration for an element.

stealth61 [152]

The answer is zinc= [Ar] 4s2 3d10

5 0

2 years ago

Why does ice float? ice is less dense than water. ice is denser than water. ice has a lower ph than water. ice has a higher ph t

Ivenika [448]

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8 0

3 years ago

Read 2 more answers

Express the quantity 24.2×10-5 m in mm. express your answer using three significant figures.

sergiy2304 [10]

I think you meant 2.42*10^-6
Remember, the first digit must be between 1 and 10 or - 1 and - 10.
(2.42*10^-6)(1000)
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3 0

3 years ago

A boy with pneumonia has lungs with a volume of 1.9 L that fill with 0.080 mol of air when he inhales. When he exhales, his lung

mariarad [96]

<u>Answer:</u> The number of moles of gas remaining in the lungs is 0.063 moles

<u>Explanation:</u>

The relationship of number of moles and volume at constant temperature and pressure was given by Avogadro's law. This law states that volume is directly proportional to number of moles at constant temperature and pressure.

The equation used to calculate number of moles is given by:

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$

where,

$V_1\text{ and }n_1$ are the initial volume and number of moles

$V_2\text{ and }n_2$ are the final volume and number of moles

We are given:

$V-1=1.9L\\n_1=0.080mol\\V_2=1.5L\\n_2=?$

Putting values in above equation, we get:

$\frac{1.9}{0.080}=\frac{1.5}{n_2}\\\\n_2=\frac{1.5\times 0.080}{1.9}=0.063$

Hence, the number of moles of gas remaining in the lungs is 0.063 moles

8 0

3 years ago

Although hcl(aq) exhibits properties of an arrhenius acid, pure hcl gas and hcl dissolved in a nonpolar solvent exhibit none of

Tema [17]

HCL(g) it consists of covalently molecules which are bonded and they do not ionize.
Non-polar solvent molecules do not attract molecules of HCL which cause them to be ionized.

3 0

3 years ago