2- How many grams of oxygen gas are needed to liberate 734 kJ of heat from the combustion of hydrogen gas ? H₂ ( g ) + O₂ ( g ) → 2 H₂O ( g ) AH = -242 kJ
3- 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 ( l ) + O₂ ( 9 ) AH 181.6 kJ How many joules of heat are needed to convert 0.860 moles of mercury ( II ) oxide to liquid mercury ?
4- When barium hydroxide , Ba ( OH ) 2 , reacts with ammonium chloride , NH4CI , a highly endothermic reaction takes place . Ba ( OH ) , ( aq ) + NH , Cl ( s ) → BaCl , ( aq ) + 2H , O ( l ) + 2NH ( g ) AH = 90.7 kJ How many moles of barium hydroxide , are needed to absorb 52.2 kJ of heat from the environment from the equation above ?
5- 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
6- How many kilojoules of heat would be required to fully melt a 0.834 m³ block of ice , provided that the density of ice is 917 kg / m³ ? H₂O ( s ) →→ H₂O ( 1 ) AH = 6.01 kJ
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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) ΔΗ = 181.6 kJ How many joules of heat are needed to convert 0.860 moles of mercury(II) oxide to liquid mercury? Question 19 1 pts When barium hydroxide, Ba(OH)2, reacts with ammonium chloride, NH4Cl, a highly endothermic reaction takes place. Ba(OH), (aq)+NH,Cl(s) →+ BaCl, (aq)+2 H,O(l)+2NH3 (g) AH =90.7 kJ How many moles of barium hydroxide, are needed to absorb 52.2 kJ of heat from the environment from the equation above?
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 Question 21 1 pts How many kilojoules of heat would be required to fully melt a 0.834 m³ block of ice, provided that the density of ice is 917 kg/m³? H₂O (s) → H₂O (1) AH = 6.01 kJ