Question

下列化肥中，氮的質(zhì)量分?jǐn)?shù)最大的是（　�。�

A．（NH4）2SO4

B．NH4HCO3

C．KNO3

D．CO（NH2）2

Answer 1

元素的質(zhì)量分?jǐn)?shù)等于該元素原子量的和與其相對(duì)分子質(zhì)量之比．
A、硫酸銨的含氮量=

2×14

2×14+8+96

×100%=21.2%
B、NH₄HCO₃的含氮量=

14

14+5+12+16×3

×100%=17.1%
C、硝酸鉀的含氮量=

14

39+14+16×3

×100%=13.86%
D、尿素的含氮量=

2×14

(14+2)×2+12+16

×100%=47%
故選D