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Consider the process of converting liquid water to steam:

 

What is true for this reaction? Select all that are true.

It is exothermic
It releases heat
It absorbs heat
ΔH = 0
It has a +ΔH
It has a −ΔH
It is endothermic

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Kenneth Duque
Kenneth DuqueLv10
12 Nov 2020

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Related questions

The preparation of NO2(g) from N2(g) and O2(g) is an endothermic reaction:

 

The enthalpy change of reaction for the balanced equation (with the lowest whole number coefficients) is ΔH = 67.7 kJ. If 250 mL N2(g) at 100°C and 3.50 atm and 450 mL O2(g) at 100°C and 3.50 atm are mixed, what amount of heat is necessary to synthesize the maximum yield of NO2(g)? 

The preparation of NO2 (g) from N2 (g) and O2 (g) is an endothermic reaction:

N2 (g) + O2 (g) → NO2 (g) (unbalanced)

The enthalpy change of reaction for the balanced equation (with lowest whole number coefficients) is ΔH = 67.7kJ.

If 2.50 × 102mL N2 (g) at 100.°C and 3.50atm and 4.50 × 102 mL O2 (g) at 100.°C and 3.50 atm are mixed, what amount of heat is necessary to synthesize the maximum yield of NO2 (g)?

The salt ammonium bromide dissolves in water according to the reaction:

 

(a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data:

   

 

 

(b) Suppose 33.3 g of NH4Br is dissolved in 0.115 L of water at 23.5 °C. Calculate the temperature reached by the solution, assuming it to be an ideal solution with a heat capacity close to that of 115 g of pure water (specific heat = 4.18 J g-1 °C-1).

(c) Heats of reaction find practical application in hot packs or cold packs. Would this dissolution reaction be appropriate for the preparation of a hot pack or a cold pack?

 

 

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