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The compound noradrenaline contains 56.79% C,6.56% H,28.37%

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The compound noradrenaline contains 56.79% C,6.56% H,28.37% O,and 8.28% N by mass.What is the e
The compound noradrenaline contains 56.79% C,6.56% H,28.37% O,and 8.28% N by
mass.What is the empirical formula for noradrenaline?
The compound noradrenaline contains 56.79% C,6.56% H,28.37%
化合物去甲肾上腺素（noradrenaline）从质量上看含了56.79%的碳元素,6.56%的氢元素,28.37%的氧元素,8.28%的氮元素.问noradrenaline的化学式是什么? 
已经知道了有4种元素了,只要知道每个有几份就行了,
假设
C->a, H->b,O->c,N->d
C的质量好像是12,H是1,O是16,N是14
化合物的质量就是12a+b+16c+14d
所以
12a/(12a+b+16c+14d)=56.79%
b/(12a+b+16c+14d)=6.56%
16c/(12a+b+16c+14d)=28.37%
14d/(12a+b+16c+14d)=8.28%
算一下a,b,c,d各等于多少就行了 
最后算出来a=8,b=11,c=3,d=1
C8H11NO3
结构是这样的（图）
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