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What is the heat change when a 535 g sample of water C 4184 JgC is cooled from

What is the heat change when a 535 g sample of water C 4184 JgC is cooled from

What is the heat change when a 53.5 g sample of water (C = 4.184 J/g?C) is cooled from 98.0?C to 23.2?C?

A)1.67 ? 104 JD)-956 J

B)-1.67 ? 104 JE)not enough information given

C)2.19 ? 104 J

 

102.              What is the heat change when a 26.8 g sample of water (C = 4.184 J/g?C) is cooled from 75.6?C to 22.1?C?

A)6.00 ? 103 JD)-1.43 ? 103 J

B)-6.00 ? 103 JE)not enough information given

C)1.43 ? 103 J

 

103.              What is the heat change when a 225 g sample of olive oil (C = 1.79 J/g C) is cooled from 95.8?C to 52.1?C?

A)9.83 ? 103 JD)1.76 ? 104 J

B)-9.83 ? 103 JE)not enough information given

C)-1.76 ? 104 J

 

104.              A 5.00 g sample of a brownie with nuts is burned in a bomb calorimeter containing 2025 g of water.  The temperature of the water increases from 23.50?C to 33.47?C.  How much heat, in joules, did the brownie release when it burned?  (Cwater = 4.184 J/g?C)

A)1.99 ? 105 JD)8.45 ? 104 J

B)2.80 ? 105 JE)7.00 ? 102 J

C)4.92 ? 102 J

 

105.              A 2.50 g sample of pitted prunes is burned in a bomb calorimeter containing 2110 g of water.  The temperature of the water increases from 22.50?C to 25.76?C.  How much heat, in joules, did the prune sample release when it burned?  (Cwater = 4.184 J/g?C)

A)1.99 ? 105 JD)2.35 ? 102 J

B)2.27 ? 105 JE)2.69 ? 102 J

C)2.88 ? 104 J

 

106.              A 3.50 g sample of rice is burned in a bomb calorimeter containing 1980 g of water.  The temperature of the water increases from 22.75?C to 28.88?C.  How much heat, in joules, did the rice sample release when it burned?  (Cwater = 4.184 J/g?C)

A)1.88 ? 105 JD)3.33 ? 102 J

B)2.39 ? 105 JE)4.22 ??102 J

C)5.08 ? 104 J

 

107.              Consider the reaction, CaCO3(s) ? CaO(s) + CO2(g)     q = 178.0 kJ

How much heat would be required to decompose exactly 4 mol CaCO3(s)?

A)  1780 kJ    B)  712 kJ    C)  178 kJ    D)  44.5 kJ    E)  89.0 kJ

 

108.              The coefficients of a balanced equation can be understood to represent either molecules or moles.

 

109.              The coefficients of a balanced equation can be understood to represent either moles or mass.

 

110.              The number of moles of reactant molecules must always equal the number of moles of  product molecules in a balanced equation.

abhinav behal 15-Feb-2020

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