Question

Tolong bantuannya nomer 20. dengan caranya ya.

Answer 1

20.) n = gr / mr
n = 9 / 18
n = 0,5 mol

delta H = reaktan - produk
= (2H-H + O=O) - (2O-H)
= (2.436 + 500) - (2.464)
= (872 + 500) - (928)
= 1372-928
= 444

q = delta H . n
q = 444 . 0,5
q = 222