During the experiment, the data given below was recorded Volume of water 450cm3 Initial temperature of water 250C Final temperature of water 46 50C Mass of ethanol lamp before burning 125 5g Mass of ethanol lamp after burning 124 0g Calculate the (a) Heat evolved during the experiment (Density of water 1g cm 3 ), specific heart capacity of water 4 2 Jg 1 k 1 ) ( 2 mks) (b) Molar heat of combustion of ethanol (C 12 0, O 16 0, H 1 0) ( 2 mks) (c) Write the equation for the complete combustion of ethanol ( 1 mk) (d) The vale of the molar heat of combustion of ethanol obtained in (b) (ii) above is lower than the theoretical value State two sources of error in the experiment

Question: During the experiment, the data given below was recorded Volume of water 450cm3 Initial temperature of water 250C Final temperature of water 46.50C Mass of

During the experiment, the data given below was recorded

Volume of water 450cm3

Initial temperature of water 250C

Final temperature of water 46.50C

Mass of ethanol + lamp before burning 125.5g

Mass of ethanol + lamp after burning 124.0g

Calculate the

(a) Heat evolved during the experiment (Density of water = 1g/cm³), specific heart capacity of water = 4.2 Jg^-1 k^-1) ( 2 mks)

(b) Molar heat of combustion of ethanol (C= 12.0, O = 16.0, H = 1.0) ( 2 mks)

(d) The vale of the molar heat of combustion of ethanol obtained in (b) (ii) above is lower than the theoretical value. State two sources of error in the experiment

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