Ответ:
2Na+2HOH=2NaOH+H2
n(Na)=2,3:23=0,1;n(NaOH)=0,1n(H2)=0,1:2=0,05;m(NaOH)=0,1*40=4;m(H2)=0,05*2=0,1
w(NaOH)=4:(100+2,3-0,1)=4:102,2=0,039(3,9%)
Ответ:
2Na+2HOH=2NaOH+H2
n(Na)=2,3:23=0,1;n(NaOH)=0,1n(H2)=0,1:2=0,05;m(NaOH)=0,1*40=4;m(H2)=0,05*2=0,1
w(NaOH)=4:(100+2,3-0,1)=4:102,2=0,039(3,9%)