(10常州26).(3分)16g Fe2O3与184g稀H2SO4恰好完全反应,求所得Fe2(SO4

(10常州26).(3分)16g Fe2O3与184g稀H2SO4恰好完全反应,求所得Fe2(SO4)3溶液的溶质质量分数。

答案

(3分)解:设反应生成的Fe2(SO4)3的质量为x
Fe2O3+3H2SO4===Fe2(SO4)3+3H2O                            (1分)   
160              400
16g               x     
 
x="40g                                         "           (1分)   
溶质的质量分数为:               (1分)   
答:所得溶液的溶质质量分数为20%。解析:

相关题目

渔家傲 范仲淹 (8分)塞下秋来风景异,浊酒一杯家万里,
渔家傲 范仲淹 (8分)塞下秋来风景异,浊酒一杯家万里,衡阳雁去无留意。燕然未勒归无计,四面边声连角起。羌管悠悠霜满地。千嶂里,长烟落日
–Mum, I failed again in today’s examination. --Oh, ________. The world is n
–Mum, I failed again in today’s examination. --Oh, ________. The world is not _______. A. come up; at its end           B. Cheer up; in the end  C. Look up; at the end        
单项选择 My sister can play        soccer and I can play      
单项选择 My sister can play        soccer and I can play        guitar. A. /, the       B. the, the       C. a, a       D. the, /
 I want to know _____. A. what the matter is B. what matter it is C. what's t
 I want to know _____. A. what the matter is B. what matter it is C. what's the matter D. the matter is what
家鸽的全身被覆          ,前肢变成翼,有迅速飞翔的
家鸽的全身被覆          ,前肢变成翼,有迅速飞翔的能力。 
 The fellow was caught stealing and is nowin the police station. A. watching o
 The fellow was caught stealing and is nowin the police station. A. watching over                    B. watching out for C. being watched over               D. being
下列物质能跟盐酸发生中和反应的是(  ) A.锌粒 B.氢氧
下列物质能跟盐酸发生中和反应的是(  ) A.锌粒 B.氢氧化钠溶液    C.氧化铜 D.碳酸钠溶液
—Don’t smoke here, please.  —_____________.     A. No problem   
—Don’t smoke here, please.  —_____________.     A. No problem        B. Never mind    C. Sorry, I won’t       D. Sure

最新题目