已知3.2g某气体中所含的分子数约为3.01×1022,此气体的摩尔质量为(  ) A.64g/mol B.64mol C.64g D.32g/mol

问题描述:

已知3.2g某气体中所含的分子数约为3.01×1022,此气体的摩尔质量为(  )
A. 64g/mol
B. 64mol
C. 64g
D. 32g/mol

M=

mNA
N
=
3.2g×6.02×1023/mol
3.01×1022
=64g/mol,
故选A.