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Heat Quiz 1. How much heat is needed to warm 30.0 g of water from 20.0 oC to 50.0 oC ? Cp = 4.18 J / go C 2. It takes 27.6 joules to heat 20.0 g of mercury from 10.0 oC to 20.0 oC. Calculate the specific heat of mercury. 3. The specific heat of aluminum is 0.900 J/g oC. If 20.0 g of aluminum at 10.oC absorbs 126 J of heat, what is its final temperature? Heat = mass (g) x ∆T (oC) x Cp (J / g oC) 1. Heat = 30.0 g x 30.0 oC x 4.18 J / goC = 3762 J = 3760 J (3.76 kJ ) 2. 27.6 J = 20.0 g x 10.0 oC x Cp ___27.6 J ___ = 20.0 g x 10.0 oC Cp = 0.138 J / g oC Heat = mass (g) x ∆T (oC) x Cp (J / g oC) 3. 126 J = 20.0 g x ∆T x 0.900 J / g oC _______126 J_______ = ∆T = 7.00 oC 20.0 g x 0.900 J / g oC Final temp. = 10. oC + 7 oC = 17 oC