Author Question: The half-life of 222Rn is 3.80 days. If a sample contains 36.0 g of Rn-222, how many years will it ... (Read 67 times)

kaid0807 · **on:** Aug 27, 2018

The half-life of 222Rn is 3.80 days. If a sample contains 36.0 g of Rn-222, how many years will it take for the sample to be reduced to 1.00 mg of Rn-222?

A) 19.7
B) 0.1597
C) 8.53
D) 0.0234
E) none of the above

Question 2

What is the concentration (M) of 39.88 mL of an unknown NaOH solution if it required 46.08 mL of 0.6592 M HCl to neutralize?

A) 0.7617
B) 2788
C) 1211
D) 1.313
E) 1.211