Naturally occurring uranium contains 0.72 percent of the isotope uranium-235. What is the mass of uranium-235 in 2,000 kg of naturally-occurring uranium?

Md Ariful Islam

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Md Ariful Islam

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We can use our percentage to find it as:
$0.72/100*2,000=14.4kg$
Percentage represents a fraction of $100$ so we can say that:
if in $100$ we have $0.72$ then in $2,000$ we'll have $x$; or using fractions:
$100/0.72$ has to be the same as $2,000/x$
i.e.
$100/0.72=(2,000)/x$
rearranging:
$x=0.72/100*2,000$

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