A gas expands and does PV work on its surroundings equal to 336 J. At the same time, it absorbs 114 J of heat from the surroudings. Calculate the...

A gas expands and does PV work on its surroundings equal to 336 J. At the same time, it absorbs 114 J of heat from the surroudings. Calculate the change in energy of the gas Note: PV work means work done by a changing volume against constant pressure. Enter your answer in scientific notation.

________ x10^___ J

Calculate the heat evolved when 471 g of white phosphorous (P4) burns in air according to the equation

P4(s) + 5O2(g) à P4O10(s)   Delta H=-3013 kJ/mol

____ kJ