biochemmathecon
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#1
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How do you work out MCQ's that give each step of a reaction and then an overall one???
For example:

Using the data below, which is the correct value for the standard enthalpy of formation for TiCl4(l)?

C(s) + TiO2(s) + 2Cl2(g) → TiCl4(l) + CO2(g) ∆H = −232 kJ mol−1
Ti(s) + O2(g) → TiO2(s) ∆H = −912 kJ mol−1
C(s) + O2(g) → CO2(g) ∆H = −394 kJ mol−1

A −1538 kJ mol−1
B −1094 kJ mol−1
C −750 kJ mol−1
D +286 kJ mol−1
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biochemmathecon
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#2
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More examples attached;
Attachment 749880749882
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TarekHelmy
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you have to draw a enthalpy change triangle you will get -750
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TarekHelmy
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questions such as this you will HAVE to draw an enthalpy change triangle
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TarekHelmy
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