化学 示例

求混合气体定律中的未知值 Determine (the)(total)(pressure)(of)a(gas)(mixture)(that)(contain)(oxygen)(nitrogenandhelium)(if)(the)(pressures)(of)(the)(gasses)(are):P(O)=150(mm)Hg(P(N))=350(mmHg)(P(He))=200(mm)Hg