Author Question: The half-life of 131I is 0.220 years. How much of a 500.0 mg sample remains after 24 hours? A) ... (Read 141 times)

WWatsford · **on:** Aug 27, 2018

The half-life of 131I is 0.220 years. How much of a 500.0 mg sample remains after 24 hours?

A) 496 mg
B) 560 mg
C) 219 mg
D) 405 mg
E) 337 mg

Question 2

The vapor pressure of pure ethanol at 60 C is 0.459 atm. Raoult's Law predicts that a solution prepared by dissolving 10.0 mmol naphthalene (nonvolatile) in 90.0 mmol ethanol will have a vapor pressure of ________ atm.

A) 0.498
B) 0.413
C) 0.790
D) 0.367
E) 0.0918