初三和高一化学题目求解
维生素药片包含维生素500g,所以其中包含了多少摩尔和多少分子的维生素?
Asampleofnitrogengashasavolumeof1.75LatSTP.HowmanymoleofN2arepresent?
CalculatethemoleculesofeachofthefollowinggaswsallatSTP.
a.0.2molH2 b.0.2gO2 c.0.2LN2
4. Calculatethe volumeofeachofthefollowinggaswsallatSTP
a.4.4gCO2 b.0.71gCL2 C.3.2gCH4
5.Asampleofgashasadensity(密度)of1.96g/LatSTP.Determineitsmolarmass(摩尔质量)
6.WhatmassofHeisrequiredtofilla1.5LballoonatSTP?(He-4)