How many atoms are in 8 gram of helium

How many moles are in 79.85g Fe2O3?

Calculate the number of molecules and atoms present in 124 g of phosphorus

Which is the most active nonmetallic element in group 16?

What would happen if there was no green house effect

When two hydrogen atoms combine with an oxygen atom, they form water. This combination is known as: A. an atom. B. a molecule. C. a chemical. D. a complex system.

Sodium chloride is stirred into water to form a solution. in this case, what are sodium chloride and the water?

What can form as a result of a chemical reaction?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.