GED Math: Calculating Rock Density Using a Graduated Cylinder

Understanding Density Calculation

• 💡 The problem involves calculating the density of a rock, a concept often seen in GED Math and Chemistry.
• 🎯 The formula for density is provided: Density = Mass / Volume.

Measuring Rock Volume

• 💧 A graduated cylinder is used to measure the water volume, initially at 21.9 ml.
• ⛰️ After placing a rock in the cylinder, the water level rises to 49.2 ml.
• 🧩 The volume of the rock is determined by subtracting the initial water volume from the combined volume of water and rock: 49.2 ml - 21.9 ml = 27.3 ml.

Calculating Rock Density

• ⚖️ The mass of the rock is given as 209 g.
• ➗ Using the density formula, divide the mass by the calculated volume: 209 g / 27.3 ml.
• 📈 The calculated density is approximately 7.66557 g/ml.
• ✅ The closest answer choice is 7.6 g/ml, though rounding to 7.7 g/ml might also be considered depending on test instructions.