The oxidation of ethanal produced 2.7 g of silver. How much acetylene will be required to obtain the required mass of ethanal?

Given:
m (Ag) = 2.7 g
Find: V (C2H2) -?
Decision:
1) Write the reaction equations:
C2H2 + H2O => CH3-COH;
CH3-COH + 2 [Ag (NH3) 2] OH => CH3-COONH4 + 2Ag ↓ + 3NH3 + H2O;
2) Calculate the amount of Ag substance:
n (Ag) = m (Ag) / M (Ag) = 2.7 / 108 = 0.025 mol;
3) Determine the amount of C2H2 substance (taking into account the coefficients in the reaction equations):
n (C2H2) = n (CH3-COH) = n (Ag) / 2 = 0.025 / 2 = 0.0125 mol;
4) Calculate the volume of C2H2:
V (C2H2) = n (C2H2) * Vm = 0.0125 * 22.4 = 0.28 l.
Answer: The volume of C2H2 is 0.28 liters.