جميلة طوط
09-11-2011, 06:45 AM
Salamou3alaikoum,
Please i need help with this problem because i have to submit it tommoro morning
In this lab, you will conduct two such investigations. In the first one we will examine the combustion of magnesium. The burning of magnesium can be represented by the equation:
Mg(s) + ½O2(g) ----> MgO(s)
This equation can be obtained by manipulating the three reactions shown below:
(1) MgO(s) + 2 HCl(aq) ----> MgCl2(aq) + H2O
(2) Mg(s) + 2 HCl(aq) -----> MgCl2(aq) + H2(g)
(3) H2(g) + ½O2(g) ---------> H2O(l)
We did an experiment for reactions 1 and 2, with mass of Mg= 0.21g, initial temperature:
23C, Final temp: 33C; and mass MgO=0.64g, Initial temp:23C, Final temp: 28C
How would you find the molar enthalpy of combustion of magnesium
when i did it i got a value of about -20 kJ/mol; however this is very low compared to the accepted value which is -601.6 KJ/mol
Please i need help with this problem because i have to submit it tommoro morning
In this lab, you will conduct two such investigations. In the first one we will examine the combustion of magnesium. The burning of magnesium can be represented by the equation:
Mg(s) + ½O2(g) ----> MgO(s)
This equation can be obtained by manipulating the three reactions shown below:
(1) MgO(s) + 2 HCl(aq) ----> MgCl2(aq) + H2O
(2) Mg(s) + 2 HCl(aq) -----> MgCl2(aq) + H2(g)
(3) H2(g) + ½O2(g) ---------> H2O(l)
We did an experiment for reactions 1 and 2, with mass of Mg= 0.21g, initial temperature:
23C, Final temp: 33C; and mass MgO=0.64g, Initial temp:23C, Final temp: 28C
How would you find the molar enthalpy of combustion of magnesium
when i did it i got a value of about -20 kJ/mol; however this is very low compared to the accepted value which is -601.6 KJ/mol