2和4的题目是英文的 如果看不懂可以电脑翻译下 1.求如下摩尔质量 a.p2o5 b.ca3(po4)2 c.na2hpo4 2.求上题的a b c 3中 how many moles of compound are present in 1g of each of the compounds. 3.求第一题a b c中每5mol有多少克化合物 4.求第一题a b c中how many atoms of phosphorus are present in 1g of each of the compounds 如果不能全答 答一道也行!