Find, using Hess's law, the overall enthalpy change of the reaction below. Determine whether the reaction is endothermic or exothermic. 2N2 + 5O2 → 2N2O5 Refer to the following reactions. 1) 2H2O → O2 + 2H2 ∆H= +572 kJ 2) N2O5 + H2O → 2HNO3 ∆H= -78 kJ 3) N2 + 3O2 + H2 → 2HNO3 ∆H= -349 kJ

Predict the enthalpy change for the reaction below using the thermochemical equations provided. 2 C2H2 + 5 O2 --> 4 CO2 + 2 H2O 4 C + 2 H2 --> 2 C2H2        Δ Hrxn = + 226.7 kJ/mol C + O2 --> CO2                   Δ Hrxn = - 393.5 kJ/mol 2 H2 +  O2 --> 2 H2O         Δ Hrxn = - 571.6 kJ/mol Group of answer choices -2372 kJ/mol -1192 kJ/mol -1919 kJ/mol -738.4 kJ/mol

For the reaction below (which will be labeled reaction A), the reaction enthalpy is unknown:                                                   2 B    + 3 H2    B2H6    HA  = ? Use the following thermochemical data to calculate the reaction enthalpy ΔHA: Reaction 1:       4 B + 3 O2 → 2 B2O3                               ΔH1 = –2509 kJ Reaction 2:       2 H2 + O2 → 2 H2O                          ΔH2 = –572 kJ Reaction 3:       B2H6 + 3 O2 → B2O3 + 3 H2O   ΔH3 = –2,159 kJ Calculate the enthalpy of reaction A (in kJ) and enter the numerical value in the answer box. Do not write units in the answer box. Clearly show on a paper how each reaction can be combined to equal reaction A  (multiply or reverse  each of the above reactions).complete work must be uploaded

What is the enthalpy change when  2.00 mol of oxygen (O2) react? C12H22O11(s)   + 12 O2(g) →    12 CO2(g)  +    11 H2O(l)        ΔH = -5644 kJ

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MISSED THIS? Read Section 7.6 (Pages 281- 284), Watch IWE 7.7 View Available Hint(s) Nitromethane (CH,NO2) burns in air to produce significant amounts of heat via the following reaction Hint 1. Calculate the number of moles of nitromethane 2CH,NO, (1) +O2(g)→ 2CO2(g) +3H,O(1) + N2(g) The value of AH is related to the balanced chemical equation by the number of moles of nitromethane. Calculate the number of moles of nitromethane in a 2.73-kg sample. AHn -1418 kJ Express your answer in moles. mol CH, NO2 44.72 Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Convert the mass of nitromethane from kg to g. Then use the molar mass of nitromethane as a conversion factor to obtain a value in mol HA Value Units = b

Consider the following reaction carried out under constant pressure         5Cl2(g) + 2P(s) → 2PCl5(g)         Δ Hrxn = -749.8 kJCalculate the heat associated with the complete reaction of 84.0 g of Cl2 with 20.6 g of P. -6.15×102 kJ -1.78×102 kJ -4.99×102 kJ -8.88×102 kJ -2.50×102 kJ

In the following reaction, what is the quantity of heat (in kJ) released when 4.93 moles of CH₄ are burned? CH₄ (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) ∆H° = -802 kJ/mol

2. The decomposition of ammonia gas into nitrogen gas and hydrogen gas is endothermic:   2 NH3 (g) → N2 (g) + 3 H2 (g)     ΔH = 92 kJ/mol   If 762 mL of hydrogen gas, measured at 325°C and 792 mmHg, is formed in the reaction above, how much heat will be absorbed?

In the following reaction, what is the quantity of heat (in kJ) released when 4.03 moles of CH₄ are burned? CH₄ (g) + 2 O₂ (g) → CO₂ (g) + 2 H₂O(g) ∆H° = -802 kJ/mol