Question

cati neutroni se gasesc in 36g de apă​

Answer 1

1 molecula de apa contine 2 at de H + 1 at. O (H2O)

A(H) = 1 si Z = 1 , stim ca A = Z + n

=> n(H) = 0

A(O) = 16 si Z = 8, stim ca A = Z + n

=> n(O) = 8

=> 1 molecula de apa contine 8 neutroni, in total

=> 1 mol de apa contine 8x6,022x10la23 neutroni

masa moleculara apa = M(H2O) = 18 g/mol

nr. moli = masa/M = 36/18 = 2 moli apa

=>

1 mol de apa contine 8x6,022x10la23 neutroni

2 moli............................ a

=> a = 2x8x6,022x10la23 = 9,635x10la24 neutroni