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    Calculate the temperature rise in 250g of water if 0.30g of a fuel (with Mr = 81.2 and ethalpy of combustion= -3350 kjmol-1) is burned

    please help me !!!
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    (Original post by orange565)
    Calculate the temperature rise in 250g of water if 0.30g of a fuel (with Mr = 81.2 and ethalpy of combustion= -3350 kjmol-1) is burned

    please help me !!!
    Convert 0.3g of fuel to moles.
    From that work out enthalpy change using the enthalpy of combustion.
    Then do Q=mc \Delta T
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    (Original post by StayWoke)
    Convert 0.3g of fuel to moles.
    From that work out enthalpy change using the enthalpy of combustion.
    Then do Q=mc \Delta T
    thanks for the reply but I don't get the 2nd and 3rd steps.. which equation do i use since i don't know the temperature rise...

    ive done this so far:

    moles = 0.3 g /81.2 = 3.69 x 10-3
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    (Original post by orange565)
    thanks for the reply but I don't get the 2nd and 3rd steps.. which equation do i use since i don't know the temperature rise...

    ive done this so far:

    moles = 0.3 g /81.2 = 3.69 x 10-3
    You wrote that the enthalpy of combustion is -3350 kJmol^-1.
    Disect that down. What does it mean for the enthalpy of combustion to be -3350kJmol^-1
    The units are a big give away.
 
 
 
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