What is the half-life of a product?

Complete this brønsted-lowry reaction placing each product by its appropriate label. hso4- + hcn

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)