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A coffee-cup (constant pressure) calorimeter is used to carry out the following reaction in 63.5 mL water (where X

is a hypothetical metal):

X + 2 H2O → X(OH)2 + H2

In this process, the water temperature rose from 25.0 °C to 34.1 °C. If 0.00618 mol of "X" was consumed during the reaction, what is ΔrH of this reaction in kJ mol-1 with respect to "X"? 

The specific heat of water is 4.184 J g-1 °C-1 

TIP: To report an answer in scientific notation, enter it using the format "2.3E4", which means "2.3 x 104" (without the quotation marks)

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