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Below is a thermochemical equation.
2Na + 2H₂O → 2NaOH + H₂ ∆H = -x kJ/mol
What is the amount of heat released if 0.5 mol of sodium reacts with sufficient water?
The following thermochemical equation represents the formation of ammonia gas.
2N₂ + 3H₂ → 2NH₃ ∆H = -xkJ/mol
Which of the following statements are true for the reaction?
When 500 cm3 of 2.0 mol dm-3 hydrochloric acid reacts with 500 cm3 of 2.0 mol dm-3 potassium hydrogen carbonate solution the temperature decreased by yoC. What is the decrease in temperature for the reaction when 50 cm3 of 2.0 mol dm-3 hydrochloric acid reacts with 50 cm3 of 2.0 mol dm-3 potassium hydrogen carbonate solution?
C + O₂ → CO₂ ∆H = -393.5 kJ mol⁻¹
The equation above represents the reaction of formation of carbon dioxide. Find the heat released when 0.2 mole of carbon dioxide is formed.
The reaction between 100 cm³ of 2.0 mol/dm³ hydrochloric acid and 100 cm³ of 2.0 mol/dm³ sodium hydroxide solution releases 10 kJ of heat. Find the change of temperature of the mixture after the reaction. [Specific heat capacity of solution = 4.2J g⁻¹; Density of solution = 1g/cm³]
Figure above shows the energy level diagrams that represent the following chemical reaction.
A + B → C + D; ∆H = x kJ/mol
What is the value of x?
C + O₂ → CO₂ ∆H = -394 kJ mol⁻¹
The equation above represents the reaction of formation of carbon dioxide. Find the heat released when 6g of carbon is fully combusted in oxygen. [Relaive atomic mass of carbon = 12]