Nightfall123
contestada

The half-life of barium-131 is 12.0 days. How many grams of
131Ba remain after 60.0 days if the initial 131Ba sample had a
mass of 10.0 g?
4

Respuesta :

Let's see

[tex]\\ \rm\Rrightarrow A=A_o(0.5)^{\frac{t}{H}}[/tex]

  • H is half-life

[tex]\\ \rm\Rrightarrow A=10(0.5)^{\frac{60}{12}}[/tex]

[tex]\\ \rm\Rrightarrow A=10(0.5)^5[/tex]

[tex]\\ \rm\Rrightarrow A=10(0.03125)[/tex]

[tex]\\ \rm\Rrightarrow A=0.3125g[/tex]

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