Question

Is anyone good at chemistry if so Is it possible could someone help me please

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Answer 1

344.0 / 68.8 = 5 (no.of half life that have elapsed)

Mass remains = (1/2)^n × (original mass)

= (1/2)^5 × 200

= (0.5) ^5 × 200

= 0.03125 × 200

= 6.25 grams