The standard enthalpy change for following reaction is 186 kJ at 298K. CaH2s ->Cas + H2g What is the standard heat of formation of CaH2(s)?

Update: The standard enthalpy change for the following reaction is 186 kJ at 298 K.
CaH2(s) Ca(s) + H2(g)
What is the standard heat of formation of CaH2(s)?
____ kJ/mol
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