Calculate the theoretical yield if the actual yield is 0.00089g from a process with a 46% yield rate

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

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume