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domthebomb
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1. Homework Statement
In a calorimeter, a 1.0g sample of magnesium is burned to form MgO. In doing so, 25.5 kJ of energy is released. The molar enthalpy of combustion of magnesium is:
a) -0.0392 kJ/mol
b) -25.5 kL/mol
c) -306.2 kJ/mol
d) -620 kJ/mol
Homework Equations
Q= mc DELTA t
The Attempt at a Solution
2Mg + O2 --> 2MgO
... don't know where to start
PLEASE! i need help fast