After 55 seconds, what mass (in g) remains of a 200.0 g sample of a reactant with a half-life of 10.0 seconds?

After 55 seconds, what mass (in g) remains of a 200.0 g sample of a reactant with a half-life of 10.0 seconds?

a. 51 g

b. 0.22 g

c. 170 g

d. 4.4 g

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