... etylic xỳc tỏc H 2SO4 c 140oC thu c a gam cht hu c Khi hiu xut 75% a bng: A 9,2500g B 13,8750g C 6,9375g D 18,5000g 38: Cho hh A: 0,15 mol Mg , 0, 35 mol Fe p vi V lit ddHNO3 1M; thu c ddB, hhG ... D HO- C5H8O2-COOH 46: Dung dch KOH 0,02M cú pH bng: A 12 B 13,7 C 12 ,02 D 11,3 47: 1,68 lớt hn hp A: CH4, C2H4 (kc) cú KLPTTB bng 20 t chỏy hon ton hhA; thu x gam CO2 Vy x bng: A 3,3g B 4,4g ... K2CO3 vaứ Na2CO3 vaứo 12g dd H 2SO4 98% Khi lng dung dich cú giỏ tr: A 22,6g B 19,96g C 18,64g D.17,32 g 49: Trn 100ml dung dch H 2SO4 0,4M vi 200ml dung dch NaOH 0,4M thu dung dch mui cú pH l: A...