Answer: E) In a closed system, the total energy always remains constant.
Explanation: For every system, the law of conservation of energy is applicable which states that the energy of the system remains conserved. Energy can neither be created nor destroyed.
A closed system is one which can exchange energy with the surroundings but not mass. Thus if a system absorbs energy, the equivalent amount of energy is lost by surroundings, thus the total energy remains constant.
If a system loses energy, an equivalent amount of energy is gained by surroundings, thus the total energy remains constant.
There is no effect of pressure if the number of moles on the gaseous reactants and the number of moles on gaseous products are equalized.However it is different for total no of gaseous reactants and total no of gaseous products.
If the total no of moles on the reactants are more than total no of moles of products,then <em>low pressure</em> will favor the<u> forward reaction.</u>
If the total no of moles on the products is more than total theno of moles of reactants,then<em> high pressure</em> will favor the <u>forward reaction</u>
Molarity is defined as the number of moles of solute in 1 L of solution the mass of sodium acetate added - 12.0 g molar mass of sodium acetate - 82 g/mol number of moles = mass present / molar mass number of moles of sodium acetate added = 12.0 g / 82 g/mol = 0.146 mol the number of moles in 250.0 mL - 0.146 mol therefore number of moles in 1000 mL - 0.146 mol / 250.0 mL x 1000 mL/L = 0.584 mol there are 0.584 mol in 1 L - 0.584 mol/L the molarity of sodium acetate is 0.584 M