Calcium carbide (CaC_2) reacts with water to produce acetylene (C_2H_2): CaC_2 (

Question

Calcium carbide (CaC_2) reacts with water to produce acetylene (C_2H_2): CaC_2 (s) + 2H_2O (g) rightarrow Ca(OH)_2 (s) + C_2H_2 (g) The complete reaction of 57.4 g of CaC_2 requires consumption of _____ g of H_2O. A) 0.895 B) 64.1 C) 32.3 D) 1.79 E) 18.0 Determine the theoretical yield of HCl if 60.0 g of BCl_3 and 37.5 g of H_2O are reacted according to the following balanced reaction. A possibly useful molar mass is BCl_3 = 117.16 g/mol. BCl_3(g) + 3 H_2O(l) rightarrow H_3BO_3(s) + 3 HCl(g) A) 75.9 g HCl B) 132 g HCl C) 187 g HCl D) 56.0 g HCl E) 25.3 g HCl

Explanation / Answer

Ans 31. C. 32.3

1 mole or 64 g of CaC2 reacts with 2 moles or 36.03 g of water

So 57.4 g of CaC2 will require ( 57.4 x 36.03) / 64

= 32.3 grams of water

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