Jawabanmu

2014-05-10T14:29:57+07:00
Jumlah mol CH4 = 1,23 liter/22,4 = 0,o5 mol

dengan rumus ideal => V=nRT/P=0,05x0,082,298/1 = 12,218 liter

2014-05-10T15:54:09+07:00
Diket: v =1,23 liter
         t = 25 drjt celcius + 273 = 298 drjt kelvin
         p = 1 atm
         mr CH4=16
dit: massa?
p x v = n x R x t
1 x 1,23 = n x 0,082 x 298
1,23 = n x 24,436
n = 24,436/1,23 =19,86 mol
n = massa/mr
19,86 = massa/ 16
massa = 16 x 19,86
           = 317,76 gram

Ganbatte !!!