Jawabanmu

2014-04-21T10:06:42+07:00
m . L + m . c . △t = P . t
40 . L + 40 . 1 . 75 = 434 . 0,24 . 60
40L + 3000 = 6249,6

40L = 3249,6
L = 81,24 kal/gr
L = 81,24 . 4,2
L = 341,208 J/gr