The half-life of 222Rn is 3.80 days. If a sample contains 36.0 g ...

[kaid0807]

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

[spencer.martell]

Answer to Question 1

B

Answer to Question 2

A

[kaid0807]

Thanks for the timely response, appreciate it

[ryhom]

Excellent