chemistry, how do i figure this out?

when you add 0.205 g of sodium metal to an excess of hydrochloric acid, you find that 2130 j of heat are produced. what is the enthalpy of the reaction as written below?
                                            2na(s)+2hcl(aq)-->2nacl(aq)+h2(g)
 
enthalpy of reaction: in kj?

the enthalpy is the energy released in this case: -2.130 kj
 
 
 
the enthalpy per mole of reactant is expressed in units of kj/mol.
 
 
(0.205 g na)(1 mole na/22.990 g) = 0.00892 mole
 
 
δh = -2.130 kj / 0.00892 mole = -238.8 kj/mol
 
 
δh is negative because energy is released by the system.