1.下列物质各1mol,质量最小的是:A.CO2 (44g/mol) B.N2 (28g/mol) C.O2 (32g/mol) D.NaCl (58.5g/mol) 2.

问题描述:

1.下列物质各1mol,质量最小的是:A.CO2 (44g/mol) B.N2 (28g/mol) C.O2 (32g/mol) D.NaCl (58.5g/mol) 2.

B.N2 (28g/mol)8.下列溶液中,溶液的pH=5的是:A. [H +] =10-8mol/L B.[OH-] =10-9mol/L C. [H +] =10-7mol/L D. [H +] =10-10mol/L