If we are sure that the formula represents the actual makeup of one molecule of the substance, the term molecular mass may be used as well. In some cases the formula represents an ionic lattice and no discrete molecule exists, as in the case of table salt, NaCl, or the formula merely represents the simplest ratio of the combined substances and not a molecule of the substance. For example, CH2 is the simplest ratio of carbon and hydrogen united to form the actual compound ethylene, C2H4. This simplest ratio formula is called the empirical formula, and the actual formula is the true formula . The formula mass is determined by multiplying the atomic mass units (as a whole number) by the subscript for that element and then adding these values for all the elements in the formula.
甚麼是molecular mass 要怎麼計算 跟formula mass有甚麼不同還是一樣?
what do the term onic lattice and no discrete molecule mean?他說 In some cases the formula represents an ionic lattice and no discrete molecule exists. 公式 formula 要怎麼表示 ionic lasttice and no discrete moelcule exist?
nacl 為甚麼是ionic compound not molecule 要怎麼分辨ionic compound 和molecule?
actual formula and true formula 是甚麼 是指實驗式嗎?
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