How much remains?

Substance X decomposes. It is found that 50% of X remains in 100 minutes. How much X remains after 200 minutes if the reaction is a zero order?

HOw would I figure out how much remains?

Answer:
It's half life is 100 minutes. So, every 100 minutes, it loses half of its mass. After 200 minutes it will have (0.5)(0.5) = 0.25 of the original.
100 precent=200 min
answer =0

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