A mixture of gaseous reactants is put into a cylinder, Where a chemical reaction

Question

A mixture of gaseous reactants is put into a cylinder, Where a chemical reaction turns them into gaseous products The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atnm The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release 226. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 333. kJ of heat flows out of the system during the reaction exothermic endothermic up down neither in out neither does work work is done on it neither Is the reaction exothermic or endothermic? x10 Does the temperature of the water bath go up or down? Does the piston move in or out? Does the gas mixture do work, or is work done on it? How much work is done on (or by) the gas mixture? Round your answer to 3 significant kJ

Explanation / Answer

a)

if it releases 226 kJ , then it is exothermic

b)

the surroundings must be abosrbing heat, then the temperature must increase

c)

Piston must move out, as it increases volume since products are GASES

d)

the gas mixture is doing work to the surroundings

e

Work by gas:

W = 226-333 = -107 kJ

assume that all the energy not used to heat, is used to move th episton

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