Chemistry Molar Volume Of Hydrogen Lab Answers

Chemistry Molar Volume Of Hydrogen Lab Answers Chemistry Molar Volume of Hydrogen Lab Answers This lab aims to determine the molar volume of hydrogen gas which is the volume occupied by one mole of hydrogen gas at a specific temperature and pressure We will achieve this by reacting magnesium metal with hydrochloric acid producing hydrogen gas We can then measure the volume of hydrogen gas produced and calculate its molar volume using the ideal gas law Theory The ideal gas law states that the pressure P multiplied by the volume V of a gas is proportional to the number of moles n and the absolute temperature T of the gas PV nRT Where R is the ideal gas constant 00821 LatmmolK In this experiment we will measure the volume of hydrogen gas produced at a specific temperature and atmospheric pressure By knowing the mass of magnesium used and the balanced chemical equation for the reaction we can calculate the moles of hydrogen gas produced Then using the ideal gas law we can calculate the molar volume of hydrogen Materials Magnesium ribbon approximately 01 g 1 M hydrochloric acid HCl solution Graduated cylinder 100 mL Beaker 250 mL Thermometer Barometer Electronic balance Safety goggles Gloves Stirring rod Distilled water Procedure 2 1 Set up the experiment Fill the graduated cylinder with water and invert it into a beaker filled with water Make sure the graduated cylinder is completely submerged and no air bubbles are present Measure and record the atmospheric pressure using a barometer Record the room temperature using a thermometer 2 Prepare the magnesium ribbon Measure and record the mass of a small piece of magnesium ribbon Cut the magnesium ribbon into small pieces and place them in a clean beaker 3 React the magnesium Add 10 mL of 1 M HCl solution to the beaker containing the magnesium ribbon Observe the reaction and note the hydrogen gas bubbles forming Allow the reaction to proceed until all the magnesium has reacted 4 Measure the hydrogen gas volume While the reaction is occurring carefully raise the graduated cylinder until the water level inside the cylinder is the same as the water level in the beaker This ensures the pressure inside the cylinder is equal to the atmospheric pressure Read and record the volume of hydrogen gas collected in the graduated cylinder 5 Calculate the molar volume of hydrogen Calculate the moles of hydrogen gas produced using the mass of magnesium and the stoichiometry of the reaction Mgs 2 HClaq MgCl2aq H2g Convert the temperature from Celsius to Kelvin TK TC 27315 Substitute the known values for pressure volume temperature and moles of hydrogen into the ideal gas law equation PV nRT to calculate the molar volume of hydrogen Data and Calculations Data Value Unit Mass of magnesium ribbon g Atmospheric pressure atm Room temperature C Volume of hydrogen gas collected mL Calculations 1 Moles of hydrogen gas produced Use the mass of magnesium and the molar mass of magnesium to calculate the moles of 3 magnesium Use the stoichiometry of the reaction to determine the moles of hydrogen gas produced 2 Molar volume of hydrogen Convert the volume of hydrogen gas from mL to L Use the ideal gas law PV nRT to calculate the molar volume of hydrogen gas Results and Discussion 1 Report the molar volume of hydrogen gas you calculated 2 Compare your calculated molar volume to the theoretical molar volume of hydrogen at standard temperature and pressure STP which is 224 Lmol Explain any discrepancies between your result and the theoretical value 3 Discuss the sources of error in your experiment and explain how they might have affected your results 4 Explain how this experiment demonstrates the relationship between the volume and moles of a gas at constant temperature and pressure Conclusion This experiment successfully demonstrated the determination of the molar volume of hydrogen gas using the ideal gas law By understanding this relationship we can better predict and analyze the behavior of gases in different conditions Further Investigation Repeat the experiment using different concentrations of hydrochloric acid Investigate the effect of temperature on the molar volume of hydrogen gas Compare the molar volumes of different gases Safety Precautions Wear safety goggles and gloves at all times during the experiment Handle hydrochloric acid with care as it is corrosive Work in a wellventilated area Do not inhale the hydrogen gas This lab provides a handson approach to understanding the relationship between volume and moles of a gas while also highlighting the importance of careful measurements and error analysis in scientific experiments 4