Examine shows that the ratio of the amount

Assignment Help Chemistry

Reference no: EM13170209

A rock sample contains traces of 238U, 235U, 232Th, 208Pb, 207Pb, and 206Pb.

Careful analysis shows that the ratio of the amount of 238U to 206Pb is 1.164.

(a) Assume that the rock originally contained no lead, and determine the age of the rock.

(b) What should be the ratios of 235U to 207Pb and of 232Th to 208Pb so that they would yield the same age for the rock?

The half-lives of the isotopes are 4.47 × 109 yr for 238U, 7.04 ×108 yr for 238U, and 1.41 × 1010 yr for 232Th.

Reference no: EM13170209

Questions Cloud

Calculate the number of excess reagent units remaining : calculate the number of excess reagent units remaining when 84 C2H4 molecules and 270 O2 molecules react?

Explain what are the principal natural sources of hydrogen : What are the principal natural sources of hydrogen? What are the principal methods for the commercial preparation of hydrogen?

What is the enthalpy of solution : a 4.5 g sample of LiCl at 25 C dissolves in 25 mL of water also at 25 C. The final equilibrium temperature of the resulting solution is 60.8 C. What is the enthalpy of solution.

Calculate the density of silver : When silver crystallizes, it forms face-centered cubic cells. The unit cell edge length is 408.7 pm. Calculate the density of silver. (Enter answer to three significant figures.)

Examine shows that the ratio of the amount : A rock sample contains traces of 238U, 235U, 232Th, 208Pb, 207Pb, and 206Pb. Careful analysis shows that the ratio of the amount of 238U to 206Pb is 1.164.

What is the molarity of the koh solution : A 33.5 mL sample of a KOH solution of unknown concentration requires 22.1 mL of 0.200 M solution to reach the end point in a titration. What is the molarity of the KOH solution?

How many options were granted during 2010 under the plan : What kind of pension plan does M&S provide its employees and what was M&S's pension expense for 2009 and 2010?

What is the value of delta h : When 414 J of heat is added to the gas, it expands and does 104 J of work on the surroundings. What is the value of delta H?

Draw the molecule by placing atoms on the grid : Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all atoms in the correct structure of ClO4-

User Account

All Pages