An 80.0 g sample of iodine-131 was placed in a sealed vessel forty days ago. Only 2.5 g of this isotope is now left. What is its half-life?

How many grams of Fe is needed to react with 35.0 g of sulfuric acid in the following reaction? 3H2SO4 + 2Fe - > Fe2 (SO4) 3 + 3H2

Over-the-counter hydrogen peroxide solutions are 3% (w/v). What is this concentration in moles per liter?

4Fe (s) + 3O (g) = 2Fe2O3 (s) If one mole of Fe reacts with excess O2, how many miles of Fe2O3 are produced?

An airplane circling in preparation for a landing

Which project can be used to determine whether a substance is a liquid or plasma

What particle is the only one that determine the type of element you have

Wetlands provide habitats for many living things because of their sheltered waters and

What reaction would the chemical equation 2H2O - - > 2H2+O2 represent? A) Replacement Of Water B) Combustion of water c) decomposition of water d) formation of water

He standard reduction potentials of lithium metal and chlorine gas are as follows: reaction reduction potential (v) li + (aq) + e-→li (s) - 3.04 cl2 (g) + 2e-→2cl - (aq) + 1.

Carbon-13 is an isotope. It has 6 protons and 13 neutrons 7 neutrons 7 electrons 13 electrons