高考问答在这条公路上行驶:化学问题
来源：百度文库 编辑：高考问答 时间：2024/05/09 20:02:23
在天平两边分别放一杯等溶质的质量分数等质量的稀盐酸,平衡后,左边加入锌片,右边加入碳酸钙,起完全反应后天平仍然平衡(固体无剩余),则锌和碳酸钙的质量比是?
原则:产生气体质量相同,则天平平衡.
左边:
Zn+2HCl==ZnCl2+H2
65`````````````````````2
右边:
CaCO3+2HCl==CaCl2+H2O+CO2
100`````````````````````````````````44
x`````````````````````````````````````2
x=50/11
Zn:CaCO3=65:50/11=143:10
0.681绝对！