Acertain system absorbs 350 joules of heat and has 230 joules of work done on it what is the value of

According to the law of conservation of mass, the amount of BARIUM present of the reactants is the same as the amount present in the products (the precipitate). 

(11.21 g BaSO4) / (233.4 g/mol BaSO4) = 0.0480 mol BaSO4 and original barium salt 

(10.0 g) / (0.0480 mol) = 208.3 g/mol 

So it must have been BaCl2, because the molar mass of Barium is 137 which leave 71 grams left. Since Barium is a +2 charge, it means the atom next to it must be twice. Chlorine mass is 35, which twice is 71

C) ideal gas law the ideal gas law. the volume (v) occupied by n moles of any gas has a pressure (p) at temperature (t) in kelvin. the relationship for these variables, p v = n r t, where r is known as the gas constant, is called the ideal gas law or equation of state.