nNaCl=5,8523+35,5=0,1(mol)nNaCl=5,8523+35,5=0,1(mol)

Ta có:

ACl=35⋅a+37⋅(100−a)100=35,5=>a=75%=>%37Cl=25%ACl=35⋅a+37⋅(100−a)100=35,5=>a=75%=>%37Cl=25%

n37Cl=25%⋅0,1=0,025(mol)n37Cl=25%⋅0,1=0,025(mol)

Số nguyên tử của 37Cl=0,025⋅6,22⋅1023=1,505⋅1022

Ta có:  

(3√2−√3).(√3+3√2)=(3√2−√3).(3√2+√3)=(3√2)2−(√3)2=9.2−3=18−3=15

Last year I used to stay up late. Now I eo to bed early.
Last year 1 used to watch TV late. Now I don’t watch TV late.
Last year I used to study badly. Now I study hard.
Last year I used to play table tennis. Now I seldom play table tennis; I play
the guitar.