Gas Stoichiometry Past Paper PDF

Gas Stoichiometry Review Glucose is combusted during cellular respiration. A) What chemical amount (moles) of water is produced from the combustion of 0.500moles glucose? Balanced chemical equation Coefficients = moles Convert moles glucose into moles water –Molar ratio ...

Gas Stoichiometry Review Glucose is combusted during cellular respiration. A) What chemical amount (moles) of water is produced from the combustion of 0.500moles glucose? Balanced chemical equation Coefficients = moles Convert moles glucose into moles water –Molar ratio  What mass of oxygen is consumed by the combustion of 0.325moles glucose? – Convert moles glucose into moles oxygen Molar ratio – Convert moles oxygen into mass oxygen Molar mass oxygen  What mass of carbon dioxide is produced by the combustion of 50.0g of glucose? – Convert mass glucose into moles glucose Molar mass glucose – Convert moles glucose into moles water Molar ratio – Convert moles water into mass water Molar mass water  What VOLUME of carbon dioxide is produced by the combustion of 50.0g of glucose? – What approaches could you take to solve for volume? – What other information do you need? – Molar volume (mol gas volume gas) @ STP / SATP – Ideal gas law V = nRT / P – Combining volumes Must start with volume gas / end with volume of gas Gas Stoichiometry Volume may be starting point or ending point Gas stoichiometry requires… – Gas volumes (L) – Pressure (kPa) – Temperature (K)  A) What volume of O2 (g) is required to completely burn 275g of ethane (C2H6 (g)) in a BBQ @ STP? – Convert 275g ethane into moles ethane – Convert moles ethane into moles O2 – @ STP Convert moles O2 into volume of O2 –Use molar volume  B) What volume of CO2 (g) is produced to completely burn 275g of butane (C4H10 (g)) in a lighter at a pressure of 98.0kPa and a temperature of 90.0ºC? – Convert mass butane into moles butane – Convert moles butane into moles of CO2 – Convert moles of CO2 into volume of CO2 NOT @ STP/SATP Use ideal gas law (PV = nRT)