Note: The question is incomplete. The complete question is given below:
A "coffee-cup" calorimetry experiment is run for the dissolution of 2.5 g of lithium nitrate placed into 97.2 mL of water. The temperature of the solution is initially at 23.5oC. After the reaction takes place, the temperature of the solution is 28.3 oC.
1. Using a density of 1.0 g/mL for the water added and adding in the mass of the lithium nitrate, what is the total mass of the solution and solid?
mass = density * volume
density of water = 1.0 g/mL; volume of water = 97.2 mL
mass of water = 1.0 g/L * 97.2 mL
mass of water = 97.2 g
mass of lithium nitrate = 2.5 g
A solution is made by dissolving a solute (usually solid) in a solvent (usually a liquid). The solute in this reaction is lithium nitrate and the solvent is water.
Total mass of solution = mass of water + mass of lithium nitrate
A baker touches a pie right after taking it out of the oven. Which statement best explains why the pie feels hot?A.Molecules in the skin move faster than molecules in the pie, so heat is transferred to the pie. B.Molecules in the pie move faster than molecules in the skin, so heat is transferred to the skin. C.Molecules in the skin move faster than molecules in the pie, so heat is transferred to the skin. D.Molecules in the pie move faster than molecules in the skin, so heat is transferred to the pie.
The answer is letter B, because according to the Second Law of Thermodynamics heat can only move from a hotter body to one of colder temperature. So that's your answer: as the molecules in the pie move faster (are hotter) than the ones in the skin, heat is transfered from the pie to the skin.
Hello! The answer would be B
"Molecules in the pie move faster than molecules in the skin, so heat is transferred to the skin"
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