Do yeast pancakes contain alcohol

To a first approximation, you can just calculate the volume of pure ethanol in each of the alcoholic ingredients (total volume * %ABV = volume of pure ethanol), add those up, and divide by the total volume of all ingredients.

For example, a margarita with 35mL 40% ABV tequila, 20mL 40% ABV Cointreau, and 15mL lime juice would have alcohol content of (35mL*40% + 20mL*40% + 15mL*0%)/(35mL+20mL+15mL) = 31% ABV.

That's an approximation because the volumes are not strictly additive: mixing 50 ml pure ethanol with 50 ml water will actually give you something like 95 ml of the mixture. To get a truly accurate answer, you'll need to measure the volume of the final drink, and divide your total alcohol content by that.

The short answer is: it depends, on exactly how you cooked the dish, and what other ingredients are in it.

In practice, for a long simmered dish, the answer is going to approach about 20% as documented in the USDA Table of Nutrient Retention Factors Release 6 under the table entry "ALC BEV,STIRRED,BKD/SIMMRD 1.5 HR". Increasing time to 2.5 hours would go down to about 5%.