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Q1mediummcqChemistryChemistry

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C(s) + 2 H_{2} (g) \to CH_{4} (g); Δ H = - 74.8 kJ mol^{- 1} . Which of the following diagrams gives an accurate representation of the above reaction? [R \to reactants; P \to products]

Q2mediummcqChemistryChemistry

Consider the following reactions:(i) H^{+} (a q) + OH^{-} (a q) = H_{2} O (l), Δ H = - x_{1} kJmol^{- 1} (ii) H_{2} (g) + \frac{1}{2} O_{2} (g) = H_{2} O (l), Δ H = - x_{2} kJmol^{- 1} (iii) CO_{2} (g) + H_{2} (g) = CO (g) + H_{2} O (l), Δ H = - x_{3} kJmol^{- 1} (iv) C_{2} H_{2} (g) + \frac{5}{2} O_{2} (g) = 2 CO_{2} + H_{2} O (l), Δ H = - x_{4} kJmol^{- 1} The enthalpy of formation of H_{2} O (l) is:

Q3mediummcqChemistryChemistry

Bond dissociation enthalpy of H_{2}, Cl_{2} and HCl are 434, 242 and 431 kJ/mol respectively. Enthalpy of formation of HCl is:

How many Enthalpy of Formation questions come in Chemistry?▼

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