In what ways could the smokestacks and the trucks cause pollution in the air?

Which of the following are correct values for the ideal gas laws constant r

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.