Chemistry, 18.03.2020 23:32 emilyy4757
When one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon tetrafluoride gases are formed and 2496.7 kJ of heat is given off. What is ΔHf° for CF4(g)?
Answers: 1
is -678.82 kJ/mol![\Delta H^o_{rxn}=\sum [n\times \Delta H_f_{(product)}]-\sum [n\times \Delta H_f_{(reactant)}]](/tpl/images/0552/8549/e893d.png)
![\Delta H_{rxn}=[(4\times \Delta H_f_{(HF(g))})+(2\times \Delta H_f_{(CF_4(g))})]-[(1\times \Delta H_f_{(C_2H_4(g))})+(6\times \Delta H_f_{(F_2(g))})]](/tpl/images/0552/8549/34d0c.png)
![-2496.7=[(4\times (-271.7))+(2\times \Delta H_f_{(CF_4(g))})]-[(1\times (52.26))+(6\times (0))]\\\\\Delta H_f_{(CF_4(g))}=-678.82kJ/mol](/tpl/images/0552/8549/b7383.png)
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When one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon tetraflu...
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