There is 0.25 g of U-235, because when a half-life passes, you need to divide by 2. Since two half-lives have passed, you need to divide by 4.
Answer:
0.25 g of U-235 isotope will left .
Explanation:
Formula used :
[tex]N=\frac{N_o}{2^n}[/tex]
where,
N = amount of U-235 left after n-half lives = ?
[tex]N_o[/tex] = Initial amount of the U-235 = 1.00 g
n = number of half lives passed = 2
[tex]N=\frac{1.00 g}{2^{2}}=0.25 g[/tex]
0.25 g of U-235 isotope will left .
