1. [b] Mercury has the following physical properties: normal melting point = -39°C, normal boiling point = 357°C, heat of fusion = 2.33 kJ/mol, heat of vaporization = 284 J/g, specific heat = 0.139 J/g·°C. Calculate ΔH for the conversion of 155 g of solid mercury at its freezing point to mercury vapor at its boiling point
So I understand that in need to use the formula msdeltaT to get the answers and I know that need to go from freezing pt to melting, then from melting to boiling, but my answer is always off from 2-4 numbers and i don't know why.
2. A 0.192 mole sample of solid NaX is dissolved in 275 mL of water in an insulated container at 23.7°C After the solid dissolves, the temperature of the water is 19.2°C. What is the heat of solution of NaX?
3. A 25.0 g sample of beryllium at 96.7°C is placed into 59.9 mL of water at 20.2°C in an insulated container. The temperature of the water at thermal equilibrium is 32.0°C. What is the specific heat of beryllium? Assume a density of 1.00 g/mL for water
So I understand that in need to use the formula msdeltaT to get the answers and I know that need to go from freezing pt to melting, then from melting to boiling, but my answer is always off from 2-4 numbers and i don't know why.
2. A 0.192 mole sample of solid NaX is dissolved in 275 mL of water in an insulated container at 23.7°C After the solid dissolves, the temperature of the water is 19.2°C. What is the heat of solution of NaX?
3. A 25.0 g sample of beryllium at 96.7°C is placed into 59.9 mL of water at 20.2°C in an insulated container. The temperature of the water at thermal equilibrium is 32.0°C. What is the specific heat of beryllium? Assume a density of 1.00 g/mL for water
0 commentaires:
Enregistrer un commentaire