Using standard heats of formation, calculate the standard enthalpy change for the following reaction. H2(g) + F2(g)^2HF(g) ANSWER: kJ

When a chemist burns ammonia according to the reaction below she finds that the reaction releases heat. (It is exothermic.) 4NH3(g) + 3O2(g) 2N2(g) + 6H2O(g) The enthalpy of the reaction DH = -1267 kJ. What is the enthalpy change (in kJ) when 3 grams of ammonia are burned?

* formation, using Standard heats of calculate the Standard enthalpy change for the following reaction. 2 H₂O(l) → 2H₂(g) + O₂ (9) 7 ANSWER: IRJ clo C

Using standard heats of formation, calculate the standard enthalpy change for the following reaction. N₂(g) + O₂(g) →→→2NO(g) ANSWER: kJ

Determine the enthalpy change, ΔHrxn, for the combustion reaction shown, using the heats of formation, ΔHf, that follow. C6H12O6(s)+6O2(g)=6CO2(g)+ 6H2O(g) Compound ΔHf (kJ/mol) C6H12O6(s) –1271 CO2(g) –393.5 H2O(g) –241.8

In the laboratory, a student dilutes 17.8 mL of a 9.80 M hydrobromic acid solution to a total volume of 125.0 mL. What is the concentration of the diluted solution? Concentration = 0.78 M

Using standard heats of formation, calculate the standard enthalpy change for the following reaction.2H2S(g) + 3O2(g)2H2O(g) + 2SO2(g)

Using standard heats of formation, calculate the standard enthalpy change for the following reaction.H2S(g) + 2H2O(l)3H2(g) + SO2(g)

Using Enthalpies of formation provided on the exam determine the change in enthalpy (kJ/mol) for the following reaction.  Do not type units into your answer.   CH4(g) + 2 O2(g) ⟶⟶ CO2(g) + 2 H2O(l)     Δ?=?ΔH=?