Question

4) Determine o número de moles abaixo: a) 5.0 gramas de NO; B) 8 Ogramasde SO3 5) Calcule a massa em gramas: a) 2,0 moles de CO b) 3,0 moles de SO2​

Answer 1

Resposta:

Let p be the vapour pressure of pure octane. The vapour pressure of solution will be

100

80

p=0.8 p.

Molar mass of solute (M) and octane (m) are 40 g/mol and 114 g/mol respectively. Mass of octane, w is 114 g.

p

p−p

′

=

Mw

Wm

p

p−0.8p

=

40×114

W×114

W=8g

Hence, 8 g of solute are required.