Ethanal was obtained from 0.84 L of acetylene with a product yield of 82%.

Ethanal was obtained from 0.84 L of acetylene with a product yield of 82%. What mass of silver can be obtained by oxidizing the aldehyde with silver oxide.

Let’s implement the solution:
1. In accordance with the condition, we write down the equations:
V = 0.84 l. W = 82%
С2Н2 + Н2О = Н2С = СНОН = Н3С – СОН – hydration, vinyl alcohol is released, ethanal was formed during its isomerization;
X g -?
CH3 – СОН + Ag2O = CH3COOH + 2Ag – oxidation of aldehyde, obtained silver, acetic acid;
2. Proportion:
1 mole of gas at normal level – 22.4 liters;
X mol (C2H2) -0.84 L. hence, X mol (C2H2) = 1 * 0.84 / 22.4 = 0.04 mol.
Y (C2H4O) = 0.04 mol since the amount of substances according to the equation is 1 mol.
3. Calculations:
M (C2H4O) = 44 g / mol;
M (Ag) = 107.8 g / mol.
4. Determine the mass, the amount of aldehyde:
m (C2H4O) = Y * M = 0.04 * 44 = 1.76 g;
m (practical) = 0.82 * 1.76 = 1.44 g;
Y (practical) = m / M = 1.44 / 44 = 0.03 mol.
5. Find the quantity and weight of the product:
0.03 mol (C2H4O) – X mol (Ag);
-1 mol – 2 mol from here, X mol (Ag) = 0.03 * 2/1 = 0.06 mol.
m (Ag) = Y * M = 0.06 * 107.8 = 6.47 g.
Answer: silver was obtained with a mass of 6.47 g.