Anyone just wanna zo. o.m so bored if not thts ok

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

50 pts plz what is the physical state of matter of baking soda.

Asample of ammonia reacts with oxygen as shown. 4nh3(g) + 5o2(g) 4no(g) + 6h2o(g) what is the limiting reactant if 4.0 g of nh3 react with 8.0 g of oxygen? o2 because it produces only 0.20 mol of no. nh3 because it produces only 0.20 mol of no. o2 because it produces two times less no than nh3. nh3 because it produces three times more no than o2.