Answered

One uranium atom has a mass of 3.95 x 10^-22 grams.

Awork out an estimate for the number of uranium atoms in 1kg
Bis your answer to (a) an underestimate or an overestimate?

Give reason for your answer.


Please help! Thanks.

Verified Answer :

apologiabiology

remember
(ab)/(cd)=(a/c)(b/d)
and
\(\frac{x^n}{x^m}=x^{n-m}\)

1kg=1000g=110^3g
hmm, I estimate, 4 of them

x=number of attoms
mass of 1 times x=110^3
3.9510^-22 times x=110^3
divide both sides by 3.95*10^-22
x=\(\frac{1*10^3}{3.95*10^{-22}}= (\frac{1}{3.95} )( \frac{10^{3}}{10^{-22}} )\)=\(0.25316*10^{25}\)=\(2.5316*10^{24}\)
a million has 9 zeroes
so 24 zeroes is alot that is a septillion, so there are 2.5316 septillion uranium atoms in 1kg


a. 4
b. underestimate

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