posted by mala .
if enthalpies for formation of p4o10, h2o and h3po4 are -2984, -285.9 and -1279 respectively calculate the enthalpy change using hess's law
Two or three points here.
1. You can't get lazy in chemistry and not use the caps key. Those symbols don't mean anything to me.
2. -2984, -285.9, -1279 what units.
3. Calculate enthalpy change for what?