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What two substances have the same solubility at 80C?

Potassium Nitrate and Sodium Nitrate


What mass of NaCl is needed to form a saturated solution at 80C?

The saturated solution of sodium chloride is 379,3 g for 1 kg solution at 8o oC.


If a solid piece of naphthalene is heated and remains at 80C until it is completely melted you know that 80C is the?

If a solid piece of naphthalene is heated and remains at 80°C until it is completely melted, you know that 80°C is the melting point of naphthalene. At this temperature, the solid phase transitions to the liquid phase, absorbing heat without a change in temperature until the entire sample is melted. This characteristic behavior is typical for substances during phase changes, where energy input goes into overcoming intermolecular forces rather than increasing temperature.


What volume will 500 mL of gas at 20 c and a pressure of 420 mm Hg occupy if the temperature is reduced to 80 c and the pressure increased to 650 mm Hg?

To solve, use the combined gas law: (P1V1/T1) = (P2V2/T2). Plug in the initial conditions (P1 = 420 mm Hg, V1 = 500 mL, T1 = 20°C), and the final conditions (P2 = 650 mm Hg, T2 = 80°C) to find V2, the final volume. Remember to convert temperatures to Kelvin by adding 273 to the Celsius temperature.


What is the melting point of LEGO?

The melting point of LEGO bricks is approximately 105°C (221°F). At this temperature, the plastic used in LEGO bricks will start to soften and deform. It is important to keep LEGO bricks away from high heat sources to prevent them from melting.