1- If the reaction between hydrogen and iodide absorbs 7.93x104 J of heat , how many moles of iodine were consumed ? H₂

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1- If the reaction between hydrogen and iodide absorbs 7.93x104 J of heat , how many moles of iodine were consumed ? H₂ ( g ) + I₂ ( s ) →→→ 2 HI ( g ) AH = 53.0 kJ
2- A mercury " mirror " can form inside a test tube when mercury ( II ) oxide . HgO ( s ) , thermally decomposes as shown in the equation below . 2 HgO ( s ) → 2 Hg ( 1 ) + O₂ ( g ) AH = 181.6 kJ How many joules of heat are needed to convert 0.860 moles of mercury ( II ) oxide to liquid mercury ?
3- When barium hydroxide , Ba ( OH ) 2 , reacts with ammonium chloride , NH4Cl , a highly endothermic reaction takes place . Ba ( OH ) ₂ ( aq ) + NH4Cl ( s ) → BaCl , ( aq ) + 2H , O ( l ) + 2NH , ( g ) AH = 90.7kJ How many moles of barium hydroxide , are needed to absorb 52.2 kJ of heat from the environment from the equation above ?
4- The reactions of nitrogen oxides are important in the environment and in industrial processes . Calculate the heat transferred , in kJ , when 243 g of NO gas reacts with excess oxygen to form solid dinitrogen pentoxide . 4 NO ( g ) + O₂ ( g ) →→ 2 N₂O5 ( s ) AH - 219 kJ