Question

将Na2O和Na2O2的混合物14g溶解在足量的水中,充分反应之后,收集到的气体在标准状况下体积为1.12...

Answer 1

(1)

2Na2O2+2H2O==4NaOH+O2↑

n(O2)=1.12/2.4=0.05mol

n(Na2O2)=0.1mol

m(Na2O2)=7.8g

Na2O质量分数=(14-7.8)/14=44.3%

(2)

n(Na2O)=(14-7.8)/62=0.1mol

n(NaOH)=2*0.1+2*0.1=0.4mol

c=0.4/0.2=2mol/L