Niobium pentachloride (11.5 g) was added to a stirred suspension of lithium dimethylamide （0.215 g-equiv）in pentane. A slow reaction occurred with the development of an orange color. The misture was kept stirred at room temperature for 20 hours and was then filtered to remove insoluble lithium salts. Evaporation of pentane from the filtrate left a light brown solid (13.8 g; calc. for Nb(NMe2)5, 13.3 g).、
请问g-equiv是什么单位？既不是0.215 g，也不是0.215当量。谢谢！
