Répondre :
m(1 goutte) = 6,28/120 = 0,052g
b) M = 3x12+8x1+3x16 = 92 g/mol
c) %massique de O = 100x3x16/92 = 52,2%
% massique de H = 100x8/92 = 8,7%
% massique de C = 100x3x12/92 = 39,1%
b) M = 3x12+8x1+3x16 = 92 g/mol
c) %massique de O = 100x3x16/92 = 52,2%
% massique de H = 100x8/92 = 8,7%
% massique de C = 100x3x12/92 = 39,1%