A rock from an asteroid contains 2 57 g of 238 92 U and 3 83 g of 206 82 Pb The molar mass of 206 82 Pb is 205 974 46 g mol, the molar mass of 238 92 U is 238 029 g mol, and the halflife of 238 92 U is 4 46 10 9 years Assume that all the 206 82 Pb came from the radioactive decay of the 238 92 U (a)...

a b c d 1 mol 232U 92 238 238029 g U 257 ...

A rock from an asteroid contains 2.57 g of 238 92 U and 3.83 g of 206

Question:

A rock from an asteroid contains 2.57 g of ²³⁸₉₂U and 3.83 g of ²⁰⁶₈₂Pb. The molar mass of ²⁰⁶₈₂Pb is 205.974 46 g/mol, the molar mass of ²³⁸₉₂U is 238.029 g/mol, and the halflife of ²³⁸₉₂U is 4.46 × 10⁹ years. Assume that all the ²⁰⁶₈₂Pb came from the radioactive decay of the ²³⁸₉₂U.