If the half life of iridium-182 is 15 years, how much of a 3 gram sample is left after 2 half-lives? A) .57 grams
B) .70 grams
C) 2.25 grams
D) .75 grams

D. 0.75 grams

Explanation:

The data given on the iridium 182 are;

The half life of the iridium 182, = 15 years

The mass of the sample of iridium, N₀ = 3 grams

The amount left, N(t) after two half lives is given as follows;

For two half lives, t = 2 ×

∴ t = 2 × 15 = 30

∴ The amount left, N(t) = 0.75 grams

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

2b2t

explanation:

2b2t