Given the thermochemical equations:
A(g) ⟶B(g)ΔH=90kJmolB(g) ⟶C(g)ΔH=−140kJmolA(g) ⟶B(g)ΔH=90kJmolB(g) ⟶C(g)ΔH=−140kJmol
Find the enthalpy changes for three given reactions.
3A(g)⟶ 3B(g)3A(g)⟶ 3B(g)
ΔH=ΔH= kJ/mol
B(g)⟶A(g)B(g)⟶A(g)
ΔH=ΔH= kJ/mol
A(g)⟶C(g)A(g)⟶C(g)
ΔH=ΔH= kJ/mol
∆H
us an extensive property and can be added , subtracted , multiplied
or divided as well .
Given the thermochemical equations: A(g) ⟶B(g)ΔH=90kJmolB(g) ⟶C(g)ΔH=−140kJmolA(g) ⟶B(g)ΔH=90kJmolB(g) ⟶C(g)ΔH=−140kJmol Find the enthalpy changes for three given...
Given the thermochemical equations: A(g)⟶B(g)Δ?=60 kJ B(g)⟶C(g)Δ?=−110 kJ find the enthalpy changes for each reaction. 3A(g)⟶3B(g)Δ?=______kJ B(g)⟶A(g)Δ?=_______kJ A(g)⟶C(g)Δ?=_______kJ
Given the thermochemical equations A(g) — Bg AH = 70 kJ B(g) — C(g) AH = -140 kJ find the enthalpy changes for each reaction 3 A(g) — 3Bg AH = B(g) Ag) AH = A(g) -C(O) AH =
V Hint Check Answer < Question 20 of 27 > Given the thermochemical equations A(g) B(g) AH = 80 kJ B(g) (g) AH = -150 kJ find the enthalpy changes for each reaction. 3 A(g) — 3B(g) AH B(g) A(g)
From the following enthalpy changes in equations (1) and (2), find the ΔH° for equation (3). (1) 2P(s) + 3Cl2(g) →2PCl3 (l) ΔH° = -640 kJ (2) 2P(s) + 5Cl2 (g) → 2PCl5 (s) ΔH° = -886 kJ (3) PCl3(l) + Cl2 (g) → 2PCl5 (s)
Given the standard enthalpy changes for the following two reactions: (1) 4C(s) + 5H2(g)-------> C4H10(g)...... ΔH° = -125.6 kJ (2) C2H2(g) ----> 2C(s) + H2(g)......ΔH° = -226.7 kJ what is the standard enthalpy change for the reaction: (3) 2C2H2(g) + 3H2(g)--------->C4H10(g)......ΔH° = ? kj
Thermochemical equations 5. Given 2NO → N2 + O2 ∆H= -180.7 determine the enthalpy of the reverse reaction? Is the reverse reaction endothermic or exothermic? 6. Given H2 + F2 → 2HF ∆H= -537 kJ a) How much heat is required to react 9.5 g F2 with H2? b) What mass of H2 is needed to react with F2 with -294 kJ of energy? Hess Law State Hess’s Law 8. Use the standard reaction enthalpies given below to determine ΔH°...
Calculate ΔH for the following reaction, CaO(s) + CO2(g) → CaCO3(s) given the thermochemical equations below. 2 Ca(s) + O2(g) → 2 CaO(s) ΔH = -1270.2 kJ C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ 2 Ca(s) + 2 C(s) + 3 O2(g) → 2 CaCO3(s) ΔH = -2413.8 kJ A compound contains C, H and O as the elements. A 20.0 g-sample is comprised of 1.34 g H and also 8.00 g of C. What...
Given the standard enthalpy changes for the following two reactions: (1) Ni(s) + Cl2(g)------->NiCl2(s)...... ΔH° = -305.3 kJ (2) Pb(s) + Cl2(g)------->PbCl2(s)......ΔH° = -359.4 kJ what is the standard enthalpy change for the reaction: (3) Ni(s) + PbCl2(s)------->NiCl2(s) + Pb(s)......ΔH° = ? __________kJ
Determine the standard enthalpy of formation of calcium carbonate from the thermochemical equations given below.Ca(OH)2(s) → CaO(s) + H2O()ΔrH° = 65.2 kJ/mol-rxnCa(OH)2(s) + CO2(g) → CaCO3(s) + H2O()ΔrH° = −113.8 kJ/mol-rxnC(s) + O2(g) → CO2(g)ΔrH° = −393.5 kJ/mol-rxn2 Ca(s) + O2(g) → 2 CaO(s)ΔrH° = −1270.2 kJ/mol-rxna.−1712.3 kJ/mol-rxnb.−1207.6 kJ/mol-rxnc.−980.6 kJ/mol-rxnd.−849.6 kJ/mol-rxne.−441.8 kJ/mol-rxn
The enthalpy of combustion (ΔH°c) of 1,1,2,2,-tetramethylcyclopropane (C7H14) is -4635.62 kJ/mol. a-Using the appropriate information given below, calculate the enthalpy of formation (ΔH°f), in kJ/mol, for 1,1,2,2,-tetramethylcyclopropane. Report your answer to two decimal places. ΔH°f (CO2 (g)) = -393.51 kJ/mol ΔH°f (H2O (l)) = -285.83 b- Determine the mass (in g) of 1,1,2,2,-tetramethylcyclopropane produced, if ΔH° was determined to be -35.93 kJ during an experiment in which 1,1,2,2,-tetramethylcyclopropane was formed. Report your answer to three significant figures.