Ammonium phosphate ((NH4), POis an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H,PO,) withammonia (NH;).What mass of ammonium phosphate is produced by the reaction of 5.3of phosphoric acid?Be sure your answer has the correct number of significant digits. A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. Thecylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. Thecylinder is also submerged in a large insulated water bath. (See sketch at right.)1 atm pressurepistoncylinderThe temperature of the water bath is monitored, and it is determined from this data that 138. kJ of heat flows into thewater bathsystem during the reaction. The position of the piston is also monitored, and it is determined from this data that thesystem does 243. kJ of work on the piston during the reaction.gasesexothermicIs the reaction exothermic or endothermic?O endothermicO upDoes the temperature of the water bath go up ordown?O downneitherO inDoes the piston move in or out?O outO neitherO absorbDoes the reaction absorb or release energy?O releaseneitherHow much energy does the reaction absorb orrelease? Be sure your answer has the correctnumber of significant digits.

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Ammonium phosphate ((NH4), PO
is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H,PO,) with
ammonia (NH;).
What mass of ammonium phosphate is produced by the reaction of 5.3
of phosphoric acid?
Be sure your answer has the correct number of significant digits.

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 atm. The
cylinder is also submerged in a large insulated water bath. (See sketch at right.)
1 atm pressure
piston
cylinder
The temperature of the water bath is monitored, and it is determined from this data that 138. kJ of heat flows into the
water bath
system during the reaction. The position of the piston is also monitored, and it is determined from this data that the
system does 243. kJ of work on the piston during the reaction.
gases
exothermic
Is the reaction exothermic or endothermic?
O endothermic
O up
Does the temperature of the water bath go up or
down?
O down
neither
O in
Does the piston move in or out?
O out
O neither
O absorb
Does the reaction absorb or release energy?
O release
neither
How much energy does the reaction absorb or
release? Be sure your answer has the correct
number of significant digits.

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