24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.79 have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

What is the chemical formula of the following compound

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%

Which element is the least metallic between cadmium, silver, zinc, or iron?