求0.8克ca,03克mg,0.2克cu,0.01克fe的物质的量之比
问题描述：
求0.8克ca,03克mg,0.2克cu,0.01克fe的物质的量之比
答
2000:1250:312.5:18
答
0.8克ca:0.8/40=0.02mol
03克mg:0.3/24=0.0125mol
0.2克cu:0.2/64=0.003125mol
0.01克fe:0.01/56=0.00018mol
自己比吧