molecular mass的用法和樣例：
例句
- The influence of solvents,molecular weight and the content of polyethersulfone on the membrane performances was studied.
研究了聚醚碸的溶劑和相對分子質量及含量對膜性能的影響。 - The structural formula, including relative and absolute stereochemistry, the molecular formula, and the relative molecular mass should be provided.
應當提供結構分子式，包括相對和絕對立體化學分子式，分子式，相對分子質量等。
