Confusion : ( the oxidation of copper(i) oxide, cu2o(s), to copper(ii) oxide, cuo(s), is an exothermic process,
2 cu2o + o2 --> 4cuo the change in enthalpy upon reaction of 75.30 g of cu2o(s) is -76.83 kj. calculate the work, w, and energy change, δurxn, when 75.30 g of cu2o(s) is oxidized at a constant pressure of 1.00 bar and a constant temperature of 25°
c.
here's my line of reasoning.. but it's been marked wrong. you in advance.
converting 75.3g of cu2o to moles of cuo, i got 1.0525mol cuo
w=-delta(n)rt = -(1.0525mol)(8.3144j/molk)(25+273.1 5)= -2.609 kj
energy change = -2.609kj+ - 76.83kj = -79.439kj

the answer is c i took the test

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.