What is the cobalt-57 decay reaction

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

How many neutrons does an element have if its atomic number is 50 and its mass number is 166