The question tells us that we have 49 grams of gold, 25 grams of carbon, .5 water. We need to find the mass percent of carbon, water and gold in our solution. The first step is to find the mass percentage of gold. To find the mass percentage of gold, we simply use the formula. So 49 grams of gold divided by the total mass of the solution, 49 grams plus 25 grams plus now we can't add kilograms to grams. So the first step is to convert this to grams.