What weight of carbon (graphite) must be burnt to produce 1000kj of energy What

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What weight of carbon (graphite) must be burnt to produce 1000kj of energy
What weight of carbon (graphite) must be burnt to produce 1000kj of energy

or CHM 113 EXPERIMENT 7 HESS'S LAW at will be the final temperature obtained when mixing 50.00 mL. of water at 25.00°C with 100.0 mL. of water at 80.00°C assuming no energy losses from the system? 7. To 50.00 mL, of water at 20°C in a calorimeter are added 50.00 mL of water at 40.00°C. The final temperature of the water after mixing is 28.00°C, w water is 4.18 J/K.g. hat is the heat capacity of the calorimeter? Assume the specific heat of

Explanation / Answer

1. The combustion of C(s)+ O2(g) -------->CO2(g), deltaH= -393.51 Kj

1 mole of Carbon generates 393.5 Kj of energy

mole= mass/atomic weight

1= mass/atomic weight, mass= 12 gm

393.51 Kj of energy is produced from 12 gm of C

1000 Kj of enery is produced from 12*1000/393.51 gm of C=30.5 gm of Carbon

2.

3.

Density of water= 1g/ml, mass of water= volume* density

Heat gained by cold water+ heat gained by calorimeter= heat lost by water

Heat lost by water= mass of hot water* specific heat* temperature difference=50*1*4.184*(40-28)=4184 joules

Heat gained by cold water= 50*4.184*(28-20)= 1673.6 joules

Heat gained by calorimeter= heat lost by water- heat gained by cold water= 4184-1673.6 =2510.4 joules

Let the heat capacity of calorimeter= C, heat gained by calorimeter= C*8

C*8= 2510.4, C= 2510.4/8= 313.8 J/deg.c

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