1. Moles of magnesium 2. Mass of magnesium chloride 3. Mass of chloride in magne
ID: 580254 • Letter: 1
Question
1. Moles of magnesium 2. Mass of magnesium chloride 3. Mass of chloride in magnesium chloride 4. Moles of chloride in magnesium chloride. 5. % Mg in magnesium chloride 6, % Cl in magnesium chloride 7. Ratio moles Cl/moles Mg 8. Actual formula of magnesium chloride is MgClz. From this formula (and the atomic masses of Mg and Cl), calculate the actual % composition of the compound Determine the % error in your results (use the % Mg you determined in #5) 9. o Mgtheoretical VoM Jactual % Mg theoretical % error X 100 Conclusion: Summarize your results and explain your %error.Explanation / Answer
1.
Moles of Mg= (0.62/mol wt of Mg)= 0.62/24
= .02583
2.
Mass of MgCl2= final wt of dish - inital wt of dish
= 41.47-39.63
=1.84 g
3.
Mass of Mg = .62g
Mas of MgCl2 = 1.84
Mass of Chloride = 1.84-.62
=1.22 g
4.
moles of Chloride= 1.22/35.5
= .0345 moles
5.
% Magnesium in MgCl2= (.62/1.84)*100
= 33.69%
6.
% Chloride in MgCl2 = 100 - % Magnesium in MgCl2
=100- 33.69
=66.31%
7.
Mg moles = 0.02583
Cl moles = .0345
ratio = .0345/.02583
=1.33
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