解析:n=0.7mol M=18g/mol
m=nM=0.7*18=12.6(g)
N(H2O)=nNA=0.7NA
N(H)=1.4NA
m(O)=n(O)*M(O)=0.7*16=11.2(g)
N(质子)=10*n(H2O)*NA=7NA