How many significant figures are there? and explain why 1) 99178 light-years 2) 2000 flowers 3) 220.00 V 4) R= 6.1789 J/mol.L 5) 2.0002 x 10^-3

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A: formulas are for first order reaction: ln [A]0[A]t=K × t half life = 0.693K

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