[chq14]

Consider the following thermochemical equation
4H3PO4 (aq) -> P4O10 + 6H20(l)  H°rxn =257.2 KJ
A) rewrite the thermochemical equation including enthalpy change as a heat term in the equation
B)How much energy is needed for the reaction of 6.54 x10^23 molecules of H3PO4 to react
C) what is the enthalpy change if 127 g of P4O10 was produced

[Jorriss]

Do you have a question about them?

[chq14]

Yes any hints on how to begin letters a b and c because i havent a clue

[chq14]

C2H4 + H2O -> Ch3Ch2OH Determine the enthalpy change of this reaction given thay: (1) CH3CH3OH (l) + 3 O2(g) -> 3H2O (l) + 2 CO2(g) deltaH° = -1367kJ (2) C2H4 (g) + 3 O2 -> 2H2O + 2CO2 (g) deltaH°= -1411kJ Thank you in advance

[Schrödinger]

Its just normal algebra, equation manipulation. Write down the equations and see how to 'add' them

[Schrödinger]

How many molecules are there in a mole?