Calcium cyanamide contains nitrogen (%):

✅ Explanation:
-Calcium cyanamide (CaCN₂) is a fertilizer that contains both calcium and nitrogen.
-The chemical formula indicates that there are two nitrogen atoms for every one molecule of calcium cyanamide.
-To calculate the percentage of nitrogen, we need the molar masses of calcium cyanamide and nitrogen
-Molar mass of calcium cyanamide (CaCN₂) = 40.08 (Ca) + 12.01 (C) + 2*14.01 (N) = 80.11 g/mol
-Molar mass of nitrogen (N) = 14.01 g/mol
-Percentage of nitrogen = (2 * Molar mass of N / Molar mass of CaCN₂) * 100
-Percentage of nitrogen = (2 * 14.01 / 80.11) * 100 = 34.98%, which is approximately 35%.
-However, commercial calcium cyanamide typically contains about 21% nitrogen due to impurities and the presence of other forms of nitrogen in the product.