The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in a tightly closed building to decrease to 2.8 % of its original value? O a. 8.9 O b. 1.0 17.8 d. 14

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multiple choice. answer both. please.

The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in a tightly closed building
to decrease to 2.8 % of its original value?
O a. 8.9
O b. 1.0
C.
17.8
O d. 14
Transcribed Image Text:The half-life of radon-222 is 2.8 days. How many days would it take for the activity due to radon in a tightly closed building to decrease to 2.8 % of its original value? O a. 8.9 O b. 1.0 C. 17.8 O d. 14
A 1.75 m aqueous solution boils at 101.1°C. Which of the following would be the best identity of solute? (Kb H20 = 0.514°C
m')
Select one:
O A. CH3COOH
B. Glucose
ОС. Са(ОН)2
D. KNO3
Transcribed Image Text:A 1.75 m aqueous solution boils at 101.1°C. Which of the following would be the best identity of solute? (Kb H20 = 0.514°C m') Select one: O A. CH3COOH B. Glucose ОС. Са(ОН)2 D. KNO3
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