Why cant scientists use carbon -14 to determine the age of an igneous rock?

What is the molar mass of babr2? a. 217.2 g/mol b. 297.1 g/mol c. 354.5 g/mol d. 434.4 g/mol

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

In the reaction h2co3 (aq) + 3nh3 (aq) = 2 nh4+ (aq) + co3 2-, how many electrons are transferred?