我怎么算的是5kg啊Both man and woman need 150 mg of iodine (碘) per day.If a brand of table salt contains 0.005% by mass of potassium iodate (KIO3),how much this salt contains the necessary daily amount of iodine for a person?A.0.05gB.0.5gC.5gD.0.05kgE.0.5kg
问题描述：
我怎么算的是5kg啊
Both man and woman need 150 mg of iodine (碘) per day.If a brand of table salt contains 0.005% by mass of potassium iodate (KIO3),how much this salt contains the necessary daily amount of iodine for a person?
A.0.05g
B.0.5g
C.5g
D.0.05kg
E.0.5kg
答
数据有疑问
答
你题目有没有错啊？
答
KIO3 - I
214 127
X 150mg
X=150/127 * 214 = 253 mg
253mg/ 0.005%= 5*10^6 mg = 5Kg
就是5KG,要不你的题目打错了
答
150mg=0.15g KIO3中I的质量分数127/(127+39+3*16) *100% =59.3458%
则所需KIO3=0.15/59.3458%
进而所需的盐=0.15/59.3458%/0.005%=5.055kg
囧