Answer the supplementary question please! NSTRUCTIONS ATOMIC MASS OF MAGNESIUM P
ID: 1030837 • Letter: A
Question
Answer the supplementary question please!NSTRUCTIONS ATOMIC MASS OF MAGNESIUM PURPOSE: The objective of this experiment is to relate measurements of physical properties of a gas (through the Ideal Gas Law) to the atomic mass of a substance using a balanced chemical equation. INTRODUCTION: Magnesium is a reactive metal that easily reacts with hydrogen ions to produce hydrogen gas and magnesium ions: Mg(s) +2H+ (aq) Mg2. (aq) + H2 A solution of hydrochloric acid (HC) will be the source of the hydrogen ions The tube used to measure the volume of gas is called an eudiometer lyoo-dee-om-i-terl and works by a simple displacement of the water in the tube. After collecting the gas produced in the reaction, the volume will be measured and the number of moles of hydrogen gas will be calculated. Because the hydrogen gas is collected by bubbling it through water, the gas collected is a mixture of H2 gas and H:O vapor. Dalton's Law of Partial Pressures states that the pressure in the tube is the sum of the component pressures: tube The pressure of the water vapor can be found in the attached table; use the vapor pressure for the temperature closest to that which you measured in the experiment The pressure inside the tube will be less than the atmospheric pressure. Therefore, not all of the water that was originally in the tube will be pushed from the tube. We will correct for the pressure difference by measuring the height difference between the water level in the tube and in the beaker in units of mm of water. That pressure difference (AP) can then be converted to mm of Hg using the following approach:
Explanation / Answer
You will get lower atomic mass than expected.
From the equation PH2 = Patmosphere - PH2O - del P
If you neglect the vapour pressure of wate that vapour pressure will be added to pressure of hydrogen gas then PH2 will become PH2+PH2O , which is higher value than the real pressure due to hydrogen gas.
Now again from equation n = PV/RT, Since P is higher than real value you get higher number of moles of hydrogen which in turn higher number of moles of Magnesium.
Molar mass = mass of magnesium / moles of magnesium; since you moles of mass a higher value you will lower molar mass than expected value.
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