Answer:
Chemical reactions and physical transformations do not create or destroy mass in an isolated system, according to the law of conservation of mass. The mass of the products in a chemical reaction must equal the mass of the reactants, according to the conservation of mass law. The law of conservation of mass can be used to solve for unknown masses, such as how much gas is consumed or produced during a reaction.
The enthalpy of combustion of 1 mole of benzene is 3169 kJ/mol .
The first step in answering this question is to obtain the balanced thermochemical equation of the reaction. The thermochemical equation shows the amount of heat lost or gained.
The thermochemical equation for the combustion of benzene is;
2 C6H6(l) + 15 O2(g) → 12 CO2(g) + 6 H2O(g) ΔrH° = -3169 kJ/mol
We can see that 1 mole of benzene releases about 3169 kJ/mol of heat.
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<h3><u>Answer;</u></h3>
C. The equilibrium position will shift away from what was added to lower its concentration.
<h3><u>Explanation;</u></h3>
- Le Chatelier's principle states that; if a system at equilibrium is disturbed, the equilibrium position will shift to counter the effects of the disturbance.
- At equilibrium, the system is disturbed when a change in conditions forces it temporarily out of equilibrium. There are three common disturbances:
1. Change in concentration.
2. Change in pressure (caused by a change in volume).
3. Change in temperature.