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11 Nov 2019

Consider the following balanced thermochemical equation for the decomposition of the mineral magnesite:

MgCO3(s) →MgO(s) + CO2(g)

 Δ

Hrxn = 117.3 kJ


(a) Is heat absorbed or released in the reaction?

(b) What is ΔHrxn for the reverse reaction?

(c) What is ΔH when 4.70 mol of CO2 reacts with excess MgO?

(d) What is ΔH when 33.0 g of CO2 reacts with excess MgO?

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Trinidad Tremblay
Trinidad TremblayLv2
27 Sep 2019

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Related questions

MgCO3(s) ? MgO(s) + CO2(g) ?Hrxn = 117.3 kJ


1) What is ?H when 5.32 mol CO2 reacts with excess MgO?

Consider the following balanced thermochemical equation for thedecomposition of the mineral magnesite:
MgCO3(s) => MgO(s) + CO2(g) ?Hrxn = 117.3 kJ

What is ?H in kJ when 28.87 g of CO2 reacts with excess MgO? (Don'ttype the units)

I need to know the correct answer and how to get that answer

1.) In a reaction, gaseous reactants form a liquid product. The heat absorbed by the surroundings is 26.0 kcal, and the work done on the system is 15,650 J. Calculate the change of inner energy of the system DE in kJ.

2.) Calculate the heat q transferred, when 25 g of water is heated from 18 °C to 92 °C?

3. A 300-g aluminum engine part at an initial temperature of 13 °C absorbs heat of 175 kJ. What is the final temperature after the heat absorption of the aluminum part?

(specific heat capacity of aluminum cAl = 0.900 J/ g × K).

4.) Consider the following balanced thermochemical reaction equation for the mineral magnesite:

MgCO3(s) ® MgO + CO2(g) ; DH = + 117.3 kJ

(a) Is this reaction endo- or exothermic?

(b) What is DH of the reverse reaction?

(c) What is DH if 150 g of MgCO3 are decomposed?

(d) What is DH if 10 mol of CO2 react with an excess of MgO?

5. Acetylene burns in air by the following equation:

2 C2H2(g) + 5 O2 ® 4 CO2(g) + 2 H2O(g) ; DHR°= - 2511.6 kJ

Given DHf° of CO2(g) = - 393.5 kJ/mol and DHf° of H2O(g) = - 241.8 kJ/mol, find DHf° of C2H2(g).

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