Here is the solution to your question: Yes, not converting the units of k could be the issue. The units of k in the given equation are g/L/hr, which means that the rate of reaction is given in grams of glucose reacted per litre of solution per hour. To use this equation with the given problem, you need to convert the units of k to match the units of glucose and the solution used in the problem. First, convert the amount of sugar used in the recipe from kg to g: 2 kg sugar = 2000 g sugar Next, calculate the initial concentration of sugar in the solution: 20 L water + 2 kg sugar = 22 L solution Concentration of sugar = 2000g sugar/ 22 L solution = 90.91 g/L Now, you need to convert the units of k to match the units of glucose and the solution used in the problem. 2.25191 g glucose / L solution/hr = 2.25191 / 180 g glucose / L solution/min = 0.01251 g glucose / L solution/min See below for question from above explanation How does this get from: 2.25191 g glucose / L solution/hr = to minutes: 2.25191 g glucose / L solution/hr = 2.25191 / 180 g glucose / L solution/min = 0.01251 g glucose / L solution/min