It has taken a radioactive isotope 16.2 years to decay to a mass of 2.5g. The half-life of the radioisotope is 3.24 years. What was the original mass of the isotope?
a.) 10. g
b.) 20. g
c.) 40. g
d.) 80. g

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the answer is a! (2.9 x 10^-18 j) hope i could someone. : )

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.