Bantu jawabb ya, caranya juga

laju = v = delta [M] / delta [ t ]
kita cari M awalnya dulu ( Mo ) dan M akhir ( Ma )
Mo = Mol / v = 0,1 / 2 = 0,05M
Ma = Mol / v = 0,05 / 2 = 0,025M
Maka lajunya =v = delta [M] / delta [ t ]
v = delta [ Mo - Ma ] / delta [ t ]
v =  [0,05 - 0,025 ] /  [ 10 ]
v = [ 0,025 ]/[10]
v= 0,0025 M/s
v = 2,5 X 10^-3 M/s
jawabnya C