Question

Acetylene reacts with moist silver(I) oxide to form water and a compound composed of silver and carbon. If HCl is added to the compound, producing acetylene and AgCl, what is the mass of acetylene formed?

a) 0.2352 g
b) 0.2822 g
c) Greater than 0.2822 g
d) Less than 0.2822 g

Answer 1

The mass of acetylene formed is 0.00367 moles.

Step-by-step explanation:

In the given reaction, CaC₂ (s) + 2 H₂O (l) → C₂H₂ (g) + Ca(OH)₂ (s), 1 mole of CaC₂ reacts to produce 1 mole of C₂H₂. Therefore, the mass of 1 mole of CaC₂ is equal to the molar mass of CaC₂, which is 64.1 g/mol. To find the mass of acetylene formed, we need to determine the amount of CaC₂ used.

Assuming that the entire sample of the compound of silver and carbon (0.2352 g) is CaC₂, we can calculate the moles of CaC₂ by dividing the mass by the molar mass: 0.2352 g / 64.1 g/mol = 0.00367 mol. Since the stoichiometry is 1:1, the moles of C₂H₂ formed is also 0.00367 mol.