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Aluminium carbide reacts with water according to the following equation: Al 4 Cl 3 + 12H 2 O gives 4Al 2 (OH) 3 + 3CH 4 (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 AlCl 3 =144; Al(OH) 3 =78]

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]

Grade:10

1 Answers

Arun
25763 Points
3 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
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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