The values of \(\Delta G_{\text {f }}^{\circ}\) for the hydrogen halides become less negative with increasing atomic number. The \(\Delta G_{\mathrm{f}}^{\circ}\) of HI is slightly positive. However, the trend in \(\Delta S_{\mathrm{f}}^{\circ}\) is to become more positive with increasing atomic number. Explain.
Text Transcription:
Delta G_f^circ
Delta S_f^circ
9/19/18 Stoichiometry and the Mole: The quantitative relationship between number of reactants and products Stoichiometry helps determine the mass or number of moles of a product that can be formed from a known quantity of a reactant Mole Ratio’s: Conversion factors that relate the number of moles of each reactant or product in a reaction to the number of moles of each other reactant or product. Mole ratios can be used to find the mass of a product that will be created from a known mass of reactants Strategy for Solving Stoichiometry Problems 1. Write and balance chemical equations for the reaction in question 2. Identify what information you have and what information you need, develop a strategy 3. Calculate the moles from grams in necessary 4. Check answer to see that it is reasonable Limiting Reactant: A reactant that is completely converted to products The number of products formed from a given amount of a reactant will react, a case which is seldom true Often there will be less of one reactant than is required to fully react with another reactant Mole Ratio Method 1. Start by calculating the number of moles of each reactant that are available 2. Use mole ratios to determine how many moles of the required to fully react with each reactant 3. The limiting reactant will be the reactant that requires fewer moles of each reactant than are available Mass Method 1. Calculate the mass of products each reactant would form in an excess of the
