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Unformatted text preview: temperature change ( T ) that a known mass ( m ) of the substance undergoes when it gains or loses a specific quantity of heat ( q ): 209 J of energy are required to increase the temperature of 50.0 g of water by 1.00 K. What is the specific heat of water? Specific heat values of some substances (J g-1 K-1 ) Al (s) 0.90 CaCO 3 (s) 0.85 C (s) 0.71 CCl 4 (l) 0.86 Fe (s) 0.45 H 2 O (l) 4.18 Hg (l) 0.14 We can calculate the quantity of heat that a substance has gained or lost by using its specific heat together with its measured mass and temperature change: rearrange: How much heat is required to raise the temperature of 250g of water from 22 C to 98 C? (specific heat of water is 4.18 J g-1 K-1 ). q = (4.18 J g-1 K-1 )*(250g)*(371-295 K) q = 79,420 J (79.420 kJ, or 7.942 x 10 4 J) What is the molar heat capacity of water? Molar heat capacity = 4.18 J g-1 K-1 * (18 grams/1.0 mole) = 75.2 J mole-1 K-1...
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