Consider heating solid water (ice) until it becomes liquid and then gas (steam) (Figure 1). Alternatively, consider the

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Consider Heating Solid Water Ice Until It Becomes Liquid And Then Gas Steam Figure 1 Alternatively Consider The 1 (33.67 KiB) Viewed 47 times

Consider Heating Solid Water Ice Until It Becomes Liquid And Then Gas Steam Figure 1 Alternatively Consider The 2 (32.3 KiB) Viewed 47 times

Consider Heating Solid Water Ice Until It Becomes Liquid And Then Gas Steam Figure 1 Alternatively Consider The 3 (32.18 KiB) Viewed 47 times

Consider heating solid water (ice) until it becomes liquid and then gas (steam) (Figure 1). Alternatively, consider the reverse process, cooling steam until it becomes water and, finally, ice (Figure 2). In each case, two types of transitions occur, those involving a temperature change with no change in phase (shown by the diagonal line segments on the graphs) and those at constant temperature with a change in phase (shown by horizontal line segments on the graphs). Figure Temperature (°C) 100 Heating curve Solid and liquid in equilibrium Solid Liquid Heat added (J) 1 of 2
Equations The heat energy associated with a change in temperature that does not involve a change in phase is given by q=msAT where q is heat in joules, m is mass in grams, s is specific heat in joules per gram-degree Celsius, J/(g°C), and AT is the temperature change in degrees Celsius. The heat energy associated with a change in phase at constant temperature is given by q=mAH where q is heat in joules, m is mass in grams, and AH is the enthalpy in joules per gram. Physical constants The constants for H2₂0 are shown here: • Specific heat of ice: Sice = 2.09 J/(g. °C) . Specific heat of liquid water: Swater = 4.18 J/(g. °C) Enthalpy of fusion (H₂O(s)-H₂O(1)): AHfus = 334 J/g Enthalpy of vaporization (H₂O(1)-H₂O(g)): AHvap=2250 J/g . .
How much heat energy, in kilojoules, is required to convert 63.0 g of ice at -18.0 °C to water at 25.0 °C ? Express your answer to three significant figures and include the appropriate units. ►View Available Hint(s) Value Submit HA ▾ Part B Units www. ? How long would it take for 1.50 mol of water at 100.0 °C to be converted completely into steam if heat were added at a constant rate of 15.0 J/s? Express your answer to three significant figures and include the appropriate units. ▸ View Available Hint(s)