Determine the molecular formula of each product used in the product. You can determine the products used in the product by looking at the ingredient list on the product label. You can determine the chemical formula for each product you find by looking in a chemistry book or looking online at a chemistry product website such as Chemical Formula, Webbook.Nist or the Chemical Compound Database (see References). The molecular formula for urea is CH4N2O.
List the molar mass of each compound and add the molar masses together to equal the total molar mass. The molar mass for urea is 60.06. Look at the front of the product and check how many grams or liters are in the entire product. Write this number down in a separate section.
Create an equation by listing the molar mass of the Urea divided by the total molar mass of the entire product. Multiply this number by the total liters of the product. This number equals the amount of total percentage of urea in the product.