Question

Substance X has half life of 30min if 10 g remain after 2hours what was orginal amount

Answer 1

160 grams

Simply derive through rate law or use logical method I used logical method and 160 gm was Initial amount

Answer 2

Answer:

The original amount = 160 grams

Explanation:

given:

element X has half-life of 30 mins

and after 2 hours the substance = 10 g

Let M be the original amount of the substance

$M \frac{30 mins}{}> \frac{M}{2}\frac{60 mins ( 1hour )}{}>\frac{M}{4}\frac{90 mins ( 1\frac{1}{2} hour) }{}>\frac{M}{8}\frac{120 mins( 2 hours )}{}>\frac{M}{16}$

so we found that ,   $\frac{M}{16} = 10 grams$

M = 10×16

M = 160 grams

Thus you got the answer !

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