The following thermochemical equation is for the reaction of CO with NO to form CO2 and N2.
2CO+2NO->2CO2+N2 ΔH° =-747kj
When 8.74 grams of CO(g) react with excess NO(g),______ kJ of energy are__________(evolved or absorbed)
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When 8.74 grams of CO(g) react with excess NO(g), the amount of energy evolved or absorbed can be calculated using the given thermochemical equation.
The molar mass of CO is 28.01 g/mol. So, the number of moles of CO can be calculated as:
moles of CO = mass of CO / molar mass of CO
moles of CO = 8.74 g / 28.01 g/mol
moles of CO = 0.312 mol (approximately)
From the balanced equation, we can see that 2 moles of CO produce -747 kJ of energy. Therefore, 0.312 moles of CO will produce:
Energy evolved or absorbed = (moles of CO / 2 moles of CO) * (-747 kJ)
Energy evolved or absorbed = (0.312 mol / 2 mol) * (-747 kJ)
Energy evolved or absorbed = -116.16 kJ
Therefore, when 8.74 grams of CO(g) react with excess NO(g), approximately 116.16 kJ of energy are evolved.
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