What is a half life?

The time taken for half of a given amount of radioactive substance to decay.

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The gases X & Y react with each other to produce gas Z according to the equation: 2X + Y ->2Z. 100cm3 of gas X was mixed with 10cm3 of gas Y, in a freely moving sealed gas syringe The reaction went to completion. What was the final volume of the syringe?


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