According to the following thermochemical reaction, how much energy is involved in the reaction of 18.5 g of NaHCO3? Is the reaction endothermic or exothermic according to how the thermochemical equation is written?

Question

According to the following thermochemical reaction, how much energy is involved in the reaction of 18.5 g of NaHCO3?  Is the reaction endothermic or exothermic according to how the thermochemical equation is written?

2NaHCO3(s)   +  129 kJ    →    Na2CO3(s)     +    H2O(l)    +    CO2(g)

Damon · Answer

You have to add heat so endothermic 129 J per 2 mol 1 mol = 23 + 1 + 12 + 48 = 84 grams 2 mol = 168 grams we only have 18.5 grams so (18.5/168)129 = 14.2 Joules

DrBob222 · Answer

I think Damon made a typo. That is kJ and not J.

Damon · Answer

Thanks for catching that !!!