英语翻译very often we wish to work out the mass of one reactantt
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Very often we wish to work out the * of one * that * exactly with a certain * of * *-

我们往往（常常）都想求出,一大组***的****中,其中一种***（具体有）多少参加了该**. or how much * is formed when ** of **.

或者说,（我们想算出）一大组***发生****,究竟**多少**. This can be done by calculating the numbers of each * or * present in a particular * or, much more simply, by the **.

根据**（旧：***子——***）的**,通过计算在该组***中、各参与**的**或**数量,就极易求得. 供参

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