1.)if 1.2 X 10 ^ 25 sodium atoms is given
2.)if 22.8 g nitrogen dioxide molecules is given
3.)if 13.2 g of hydrated magnesium sulphate, mgso4.7H2o is given
4.)Calculate the masses if 1.9 x 10^ 24 athane molcules , C2H6 is given
3.90 x 10^22 argon atoms is given
5.)in 67.5 g of hydrated alumnium sulphate Al2(so4)3.6H2O,calculate
the number of sulphur atoms 6.)calculate yhe number of oxgen atoms
7.) calculate the number of ions
更新1:
when a metal M is completely changed to its ion , 1.96 g of M give 3.60 x 10 ^ 22 electron. the atomic mass of M is 65.4 8.) what is the number of moles of 1.96 g of M? 9.) what is the number of moles of electrons given out ?
更新2:
10.) what is the charge on the ions of M ? For all question relative atomic masses H=1.0 C=12.0 N=14.0 O=16.0 Na = 23.0 Mg = 24.0 S= 32.0 Ar=40.0 Avogadro constant = 6.02 x 10^23 relative atomic masses H = 1.0 o =16.0 Al = 27.0 S=32.0