Question

Calculati masa in grame pentru:
a)30,115•10²³ atomi N.
b) 4 moli atomi Na.
c) un atom de S
d) 2 k moli atomi de fe.
Va roog ajutatima!

Answer 1

a)γ=N/Na=30.115*10²³/6.02*10²³=5 mol

m=M*γ=28g/mol*5mol=140g

b)m=M*γ=23g/mol*4mol=92g

c)γ=N/Na=1/6.02*10²³=0.166*10⁻²³ mol

m=32*0.166*10⁻²³ mol=5.3*10⁻²g

d)m=M*γ=56*2=112 g