Given these reactions,

X(s) +1/2 O2(g) --> XO(s)

H=-639.7
XCO3(s) --> XO(s)+CO2(g)
H=+349.7
What is H(rxn) for this reaction?

X(s)+1/2 O2(g)+CO2(g) --> XCO3(s)

its first and third is your answer i did the qustion the fourth isnt right

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the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .