A substance has twice the number of particles as 12 grams of carbon-12. How many moles are in the substance?

What is the formula that this ionic compounds could form sr2+p3-o2-

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?