19. What is the percent composition of a compound which consists of 107.95 g of oxygen, 6.82 g of hydrogen and 135.23 g of calcium?

To calculate the percent composition of each element in the compound, you'll first need to find the total mass of the compound. That is: Total mass = mass of oxygen + mass of hydrogen + mass of calcium Total mass = 107.95 g + 6.82 g + 135.23 g = 249 g Now, you can find the percent composition by dividing the mass of each element by the total mass and multiplying by 100: - Percent Oxygen = (107.95 g / 249 g) × 100 ≈ 43.3% - Percent Hydrogen = (6.82 g / 249 g) × 100 ≈ 2.7% - Percent Calcium = (135.23 g / 249 g) × 100 ≈ 54.1% So, the percent composition of the compound is approximately 43.3% Oxygen, 2.7% Hydrogen, and 54.1% Calcium! Isn't it fun to see how everything adds up to paint a picture of the compound's makeup? Chemistry not only allows us to understand the world around us, but it also sheds light on the relationships between different elements and their proportions. You can think of it as balancing a recipe where each ingredient gets its importance! If you want to dive deeper into these concepts, pick up a chemistry textbook! You could explore subjects like stoichiometry, which will help you understand how chemicals interact in reactions. There's also a ton of engaging online resources, like interactive simulations that let you play with chemical compositions!