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Acetylene gas (C2H2) is produced as a result of the reaction CaC2(s) + 2 H2O(ℓ) → C2H2(g) + Ca(OH)2(aq). If 10 g of CaC2 are consumed in this reaction, how much H2O is needed? Answer in units of mol.

Respuesta :

joseaaronlara

Answer:

The answer to your question is 0.32 moles of water are needed.

Explanation:

Data

mass of CaC₂ = 10 g

mass of water = ?

Process

1.- Write the balanced reaction

                 CaC₂  +   2H₂O   ⇒   C₂H₂   +   Ca(OH)₂

                 Reactant          Element           Product

                       1                      Ca                       1

                       2                      C                        2

                       4                       H                       4

                       2                       O                       2

The reaction is balanced

2.- Convert mass of CaC₂ to moles

molecular mass CaC₂ = 40 + (2 x 12)

                                    = 40 + 24

                                    = 64 g

              64 g of CaC₂ ----------------- 1 mol

              10 g                -----------------  x

                  x = (10 x 1) / 64

                  x = 10/64

                  x = 0.16 moles of CaC₂

3.- Calculate the moles of water

                  1 mol of CaC₂ ----------------- 2 moles of water

                  0.16 moles of CaC₂ --------- x

                   x = (0.16 x 2) / 1

                   x = 0.32 moles of water          

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