Thermodynamics question

[grannysmith]

Hey guys, this question has got me stumped :/

Use these reactions, and the standard enthalpies as shown:
 
M(s) + CO2(g)  →  CO(g) + MO(s)                  ΔH° =  –140.0 kJ
3 MO(s) + CO2(g)  → CO(g) + M3O4(s)          ΔH° =  +1.20 kJ
2 M3O4(s) + CO2(g)  →  CO(g) + 3 M2O3(s)    ΔH° =  –380.0 kJ
M2O3(s) + CO2(g)  →  CO(g) + 2 MO2(s)        ΔH° =  –121.8 kJ
2 MO2(s) + CO2(g)  →  CO(g) + M2O5(s)        ΔH° =  +344.5 kJ
 
to find the value for:
3 M2O5(s) + 7 CO(g)  →  7 CO2(g) + 2 M3O4(s)

Thanks

[grannysmith]

DW guys, got it. Sorry if anyone was already in the midst of writing up a solution!

[ultimatelel]

oh my god i had that question too and just massvely couldn't be bothered doing it
how'd you get it?