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BCl3 + 3 H2O → H3BO3 + 3 HCl; ∆H = –112 kJ
How much energy is released if four moles of water react?
How much energy is released if 14.5 g of HCl is produced?

2HgO → 2 Hg + O2; ∆H = +181 kJ
How many grams of HgO are used when 475 kJ is reacted?
How many grams of O2 are absorbed when 179 kJ is produced?

S2Cl2 + CCl4 → CS2 + 3 Cl2; ∆H = +112 kJ
How many grams of chlorine are absorbed when 145 kJ is produced?
If 14.5 g of S2Cl2is used, how much energy is produced?

CaCO3 + 2 NH3 → Ca(CN)2 + 3 H2O; ∆H = –90.0 kJ
How many grams of NH3 are used when 798 kJ is released?
How much energy is released if 19.7 g of water is produced?

Respuesta :

hgj546
(4 mol H2O) x (112 kJ / 3 mol H2O) = 149 kJ 

(14.5 g HCl) / (36.4611 g HCl/mol) x (112 kJ / 3 mol HCl) = 14.9 kJ 

(475 kJ) / (181 kJ / 2 mol HgO) x (216.5894 g HgO/mol) = 1137 g HgO 

(179 kJ) / (181 kJ / 1 mol O2) x (31.99886 g O2/mol) = 31.6 g O2 

(145 kJ) / (112 kJ / 3 mol Cl2) x (70.9064 g Cl2/mol) = 275 g Cl2 

(14.5 g S2Cl2) / (135.0360 g S2Cl2/mol) x (112 kJ / 1 mol S2Cl2) = 12.0 kJ 

CaCO3 + 2 NH3 → CaCN2 + 3 H2O; ∆H = –90.0 kJ 
(798 kJ) / (90.0 kJ / 2 mol HN3) x (17.03056 g NH3/mol) = 302 g NH3 

(19.7 g H2O) / (18.01532 g H2O/mol) x (90.0 kJ / 3 mol H2O) = 32.8 kJ

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