How many totals atoms are present in the compound : Mg(OH)2

A. 3
B. 4
C. 5
D. 7

Write two balanced equations 1. dissolving of solid sodium hydroxide in water 2. the reaction of sodium hydroxide solution with hydrochloric acid

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?