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Grade 1010 grade science

Aluminium carbide reacts with water according to the following equation:
Al₄Cl₃ + 12H₂O gives 4Al₂(OH)₃ + 3CH₄
(1)what mass of aluminium hydroxide is formed frm 12g of aluminium carbide ?
(2)what volume of methane at s.t.p is obtained from 12g of aluminium carbide?
[Relative molecular weight of AlCl₃ =144; Al(OH)₃ =78]

meenu s nair

8 Years agoGrade 10

1 Answer

Arun

8 Years ago

According to balance equation
Al4C3 + 12 H2O → 3CH4 + 4Al(OH)3
Molar mass of aluminium carbide is 144 g mol-1
Number of moles of Aluminium carbide = 12 g/ 144 g mol-1
= 1/12 mol
1 mol of aluminium carbide produce 3 moles of methane at STP.
1 mole = 22.4 L at STP
Therefore 3 mole = 3 x 22.4 L = 67.2 L of methane at STP
Or 1 mole of Aluminium carbide produce 67.2 L of methane at STP
therefore 1/12 mol of Aluminium carbide will produce = 67.2 L/1 mol x 1/12 mol
= 5.6 L of methane

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