Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 154.9 kg of SiO2 is allowed to react with 78.0 kg of carbon to produce 66.0 kg of silicon.

1. Determine the limiting reactant for the reaction (SiO2 or C)

2. Determine the theoretical yield for the reaction

3. Determine the percent yield for the reaction

SiO2 is the limiting reactant

The theoretical yield is is 72286.76g

% yield= 91%

Explanation:

The first step is to put down the balanced reaction equation which serves as a guide to solving any problem of this sort. Then we check the relative amounts of SiO2 and carbon in order to determine the limiting reactant as shown. It can clearly be seen that SiO2 is the limiting reactant. It is now used to calculate the theoretical yield of silicon.

The ratio shows that 1 mole of SiO2 produces 1 mole of Silicon. The percentage yield can then be calculated as shown in the image attached.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.