H Name Specific Heat & Latent Heat Calcs 2019 YJUA ^ Per Specific Heat Substance Specific Heat Substance H 0 (s) 2.06 J/g nC Aluminum (s) 0.900 J/g °C HzO (g) 2.02 J/g nC Benzene (I) 1.74 J/g °C H,0 (I) 4.18 J/g °C Ethanol (I) 2.42 J/g °C * Substance Latent Heat of Fusion Latent Heat of Vaporization Boiling Point (K) Melting Point (K) H:0 334 J/g 2260 J/g 373.2 273.2 Benzene 136 J/g 394 J/g 353.2 278.6 Ethanol 99.8 J/g 944 J/g 351.5 158.7 Acetone 98.5 J/g 501 J/g 329.4 179.0 SPECIFIC HEAT Specific heat is defined as the amount of heat energy needed to raise 1 gram of a substance by 1*C. Be your units for specific heat match the units in the problem. jsure I he equation is Q = mC{Tf - Ti) where Q is the heat energy (joules), m is the mass of the sample (grams or kilograms*), C is the specific heat of the substance ( J/g*C), and 7> - T, is the change in temperature ( *C) The higher the specific heat, the more energy is required to cause a change in temperature. . *This equation is used when the state of matter does not change Q - m A AT ^ 1. How much heat energy is required to raise the temperature of degrees Celsius? (Specific Heat of steel = 470 J/kg*C) Q - . (i o - 0(^10 Vte' cYlO. £> t ) ^ 1.0 kilogram of steel by 10.0 2. What is the mass of a concrete block of concrete that gains 52,800 joules of energy when its temperature is increased by 5.0 ‘Celsius? (Specific Heat of concrete = 880 J/kg*C) ., 53 ¥>00 5 la r-^T) 0 3. What is the change in temperature for a 2.0 x103 gram mass of water that loses 8 500 joules of energy? (Specific Heat of water = 4.18 J/g*C) ^ ' S ,S 0 D 3 ~ / AT= _ I^.o C < '0 LATENT HEAT Latent heat is defined as the “hidden” heat when a substance absorbs or releases heat without producing a change in the temperature of the substance (ex: during a phase change). Be sure your units for specific J heat match the units in the problem. The equation for Latent Heat of Fusion is Q = mLf where Q is the heat energy (joules), m is the mass of the sample (grams or kilograms*), Lf is the latent heat of fusion for the substance (J/g) *This equation is used when the sample is changing from a solid to a liquid. The equation for Latent Heat of Vaporization is Q = mLv where Q is the heat energy (joules), m is the mass of the sample (grams or kilograms*), Lv is the latent heat of vaporization for the substance (J/g) *This equation is used when the sample is changing from a liquid to a gas. L 1. How much heat is required tofr el 25.0 g of ice at 0°C? Q ^ — rr L|. - as. o \ favy§y,25.0 g of Ethanol at 351.5 Q( as ,0 ~ as,i oo s ) SPECIFIC HEAT AND LATENT HEAT COMBINED / 2. How much heat is required to( - 4 -r * ^ ^ / cy ) 3. You have a sample of H2O with a mass of 23.0 g at a temperature of -46.0 °C. How many kilojoules (kj) of heat energy are necessary to: .Dk Q - fnCfr'T A) heat the ice to 0°C? $ * ( W ' OgXa Vj ^y*1* 0 O- am 1 ' WN 6 = S? - ml\r - (/5 * ^ 5i ^ O 03- 3 D s/ ' c)6 • >t| ^ 11 . - 5/v £)( <& I 5 O ^ .0 A - .k| V 3 4 lfc 4. How much heat is required to change 25.0 g of liquid Ethanol that is at a temperature of 158.7 K to a gas at 351.5 K? K^ rwcjyr D 9 B) melt the ice? Q' (y® H> 0 3ft, G> 00 36; ^.b 4 tO ' F7 1 C\ K3] 1 3 55 500 5|

Specific Heat & Latent Calcs 2019

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