Calculate ΔHrxn for the following reaction: Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g) Use the following reactions and given ΔH values: 2Fe(s)+32O2(g)→Fe2O3(s),ΔH CO(g)+12O2(g)→CO2(g),ΔH==−824.2kJ−2 82.7kJ

Answer : The value of is, -23.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

The main reaction is,

The intermediate balanced chemical reaction will be,

(1)    

(2)    

We are reversing reaction 1 and multiplying reaction 2 by 3 and then adding all the equations, we get :

(1)    

(2)    

The expression for enthalpy of the reaction is:

Therefore, the value of is, -23.9 kJ

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023