Basic Stoichiometry Phet Lab Essay

Stoichiometry is a very important part of chemistry. Stoichiometry refers to calculating the masses of molecules and their products . The reactants are usually given and stoichiometry is used to find the products of the equations as well balancing the equation. An example of this would be sodium chloride (NaCl). Stoichiometry will say that if there are ten thousand atoms of sodium and one atom of chlorine, only one molecule of sodium chloride can be made and that fact can never be changed.

Mole of chlorine : 1.0217g - .221g - .3946 g = .4061 g of chlorine

In chemical reactions, the significance of knowing the limiting reactant is high. In order to increase the percent yield of product, increasing the limiting reactant, possibly, is the most effective. In this experiment we were able to calculate limiting reactants from the reaction of CaCl2. 2H2O + K2C2O4.H2O(aq).

1. Suppose that you have an unlimited supply of copper (II) sulfate to react with iron. How many moles of copper would be

By definition, chemistry is the scientific branch concerned with atoms, molecules, chemical elements and how they form compounds and undergo reactions.

9. How many moles of NaOH would be needed to completely react with all of the excess HCl determined in problem 8?

If the relative amount of reactants is altered, then the limiting reactant may change accordingly. For example, a balanced chemical equation of a certain reaction specifies that an equal number of moles of two substances A and B is required. If there are more moles of B than of A, then A is the limiting reactant because it is completely consumed when the reaction stops and there is an excess of B left over.

In-depth Discussion about Stoichiometry Moles and Avogadro’s Number Numbers are conveniently measured in units of moles of atoms. A mole of an atom of any element is the same as the number of atoms in 12 grams of the isotope Carbon-12. Amedeo Avogadro determined that the number of atoms in one mole of atoms of any element is 6.022 x1023 atoms. This number is called Avogadro’s number, in honor of the chemist that discovered this.

Stoichiometry is a method scientists use to presume how two or more substances will react together. In order to do so successfully, the reactants are positioned on the left and the products on the right. The most important part of successfully

A mole is a standardized internationally unit of measurement used in chemistry. This measurement is based on something reproducible. Like a dozen cinnamon rolls, or dozen apples is reproducible with a known amount of 12. A mole is an amount of anything that has the same number of particles found in 12 grams of carbon 12. That number is 6.022x10^23 which we call Avogadro's number. This is an important concept because it provides a unit of measurement with a consistency in performing calculations in chemistry and easily converts grams to moles. We use moles (a known amount or proportion) to measure the amount of reactants and amount product from a chemical reaction.

Stoichiometry has many uses in the real world. In the chemical industry and in professional scientific experiments, scientists use stoichiometry to save money. Scientists use stoichiometric calculations to determine the amount of a substance they need to purchase for a specific reaction. There are four possible reactions that can occur when sodium bicarbonate thermally decomposes. In this lab, stoichiometry was used to find out which balanced chemical equation out the four best represents the thermal decomposition of sodium bicarbonate.

A chemical formula is a way to show chemical symbols and numbers to represent a substance.

* Size- If one of the reactants is a solid it will have a smaller

f 241.8 kJ/mol Note that I usually will not have you calculate Hfº on homeworks or tests – so you generally don’t have to worry about normalizing your answer to a per mole basis. Hess 's Law -- Adding Reactions

Stoichiometry is known as the proportional relationship between substances during a chemical reaction. Stoichiometry helps to determinate how much of a product will be needed, or maybe how much you started with. The limiting reactant is the substance that is totally used when the chemical reaction is complete. In a chemical experiment when two substances are reacting, one reactant will be consumed first then the other one and it will be call the Limiting Reactant. The excess reactant is the substance that is not used up completely in a reaction. The theoretical yield of a reaction is the amount of product that would be produced in a complete reaction, whereas the amount actually produced of a product is the actual yield. The Percent Yield gives