All elements in their standard states (oxygen<span> gas, solid carbon in the form of graphite, etc.) have a standard </span>enthalpy of formation<span> of </span>zero<span>, as there is no change involved in their </span>formation<span>.</span>
<span>43.83g of nacl are required to </span><span>make 500.0 ml of a 1.500 m solution.</span>
His the answer I hope it helps
H20 = 2.741 x 10^23
C6H8 = 1.0823 x 10^23