Which of the following would have a standard heat of formation ΔH°f, be zero at 25°C? Group of answer choicesC3CC4C2

Calculate the heat of the following reaction:2C2H2 + 5O2 → 4CO2 + 2H2OGiven the following heats of formation:C2H2                    ΔH°f= 226.7 kJ/molO2                       ΔH°f= 0.0 kJ/molCO2                    ΔH°f= -393.5 kJ/molH2O                    ΔH°f= -241.8 kJ/molGroup of answer choices-2284.3 kJ/mol-2511 kJ/mol408.6 kJ/mol0.0 kJ/mol

Which would not have a heat of formation of 0 kJ/mol?   Group of answer choicesF2(g)H2(g)S2(g)Kr(g)

To find the enthalpy of a reaction using heats of formation…Group of answer choicessubtract the product heats of formation from reactant heats of formationsubtract the reactant heats of formation from product heats of formation

The specific heat of liquid water is _____ Jg ∘C. a 4.18 b 1.87 c 2.44 d 2.06

Which reaction below would represent the standard enthalpy of formation for CHCl3 at 25°C? Hint: The reaction must be balanced. Fractional coefficients are ok in heats of formation. All reactants must be elements in their standard state (solid, liquid, or gas) at 25°C. Remember that certain elements exist as diatomics (O2, N2, F2, H2, I2, Cl2, Br2).Group of answer choicesCHCl3(l) → C(s) + H(g) + 3 Cl(g)C(s) + H(g) + 3 Cl(g) → CHCl3(l)C(s) + 1/2 H2(g) + 3/2 Cl2(g) → CHCl3(l)2 C(s) + H2(g) + 3 Cl2(g) → 2 CHCl3(l)