Question

VA ROG!!URGENT!!DAU COROANA!!!!!!!Calculează numărul de molecule și numărul total total de atomi din:
a)3 moli de amoniac
b)49 g acid sulfuric
c)1 kmol neon
d)88 g dioxid de carbon

Answer 1

a) M3NH3=3(14+3)=51g/mol
nr molecule = n*NA(nr lui Avogadro) = 3*6.022*10^23=18.066*10^23 molecule
nr atomi 3NH3=3:9=1:3
b)MH2So4=98g/mol
n=m/M=49/98=0.5 moli
nr molecule = 0.5*6.022*10^23=3.011*10^23 molecule
nr atomi H2SO4=2:1:4
c)1 kmol =1000moli
nr molecule = n*NA=1*6.022*10^23=6.022*10^23 kmoli/molecule
nr atomi = 1
c)KCo2=44g/mol
n=m/M=88/44=2 moli Co2
nr molecule = n*NA= 2*6.022*10^23=12.044*10^23 molecule
nr atomi = 1:2