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lidiya [134]
3 years ago
8

PLEASE HELP MEEEE! WILL MARK BRAINLIEST IF CORRECT!

Chemistry
2 answers:
Mrac [35]3 years ago
8 0

Answer:

the last one

Explanation:

Tanzania [10]3 years ago
3 0

Answer:

the answer is A

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Many grasses and few trees characterize ____________ (tundras/temperate grasslands).
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How many grams of iron metal do you expect to be produced when 275 grams of an 65.5 percent by mass iron (II) nitrate solution r
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Iodine-131 half life 8.040 how long will it take for a 40 gram sample of iodine-131 to decay to 0.75 grams
otez555 [7]

Answer:

See explanation below

Explanation:

To get this, we need to apply the general expression for half life decay:

N = N₀e(-λt)    (1)

Where:

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t: time required to decay

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λ = t₁₂/ln2   (2)

And we have the value of half life, so, replacing we have:

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Now, we can replace in (1) and then, solve for t:

0.75 = 40 exp(-11.6t)

0.75 / 40 = exp(-11.6t)

ln(0.01875) = -11.6t

-3.9766 = -11.6t

t = -3.9766 / -11.6

<h2>t = 0.34 days</h2><h2></h2>
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3 years ago
A 775 mL sample of NO2 is at STP. if he volume changes to 615 mL and the temperature changes to 25.0, what will be the new press
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Yes you can use that 1 equation.. P1V1/(n1T1) = P2V2/(n2T2) for ALL of your two state ideal gas law type problems. Use it in place of boyles, charles, avogadros, combined, etc laws...just like I showed you above 
<span>(1).. write down P1V1/(n1T1) = P2V2/(n2T2) </span>
<span>(2).. rearrange for your desired unknown </span>
<span>(3).. determine what is constant and what varies.. cancel the constants </span>
<span>(4).. plug and chug.. don't forget Temperature must be on an absolute scale.. R or K.. never °F nor °C </span>
4 0
3 years ago
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