Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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I need help with question three. I provided the information and also the answer to question 2, which I got 52.824kJ. On question three I just need option: 1,2,&4.
Transcribed Image Text:Drink Industry Heats Up the Polar Express
As the CEO of a beverage company, you were
thrilled to land a big contract with the Polar
Express. They need cocoa, and lots of it. However,
Aluminum container
to make things more magical (and convenient),
they want it to come in self-heating cans. The
Cappu
dente
Compartment with CaCl,
Chocolate
holiday season is only a couple months away, so
you need to start product design23875
immediately. You and your board members have
gathered to discuss your options.
Aluminum foil membrane
3scaute
Water
Polypropylene can
Background:
Typically, self-heating cans are designed to
combine two or more chemical reactants when the
sides of the can are pressed or a button is pushed.
This results in an exothermic reaction, which heats the drink without the need for a stove or microwave.
You and your board members need to decide which reactants you will be using in your final product.
Figure 1: Composite drawing of the self-heating unit
provided by students from Universidad Politécnica de
Madrid.
Option #1:
Jasmine did some reading and said that she's seen other companies use the dissolution of calcium
chloride in water.
CaCl, (s) - Ca²+(aq) + 2 CI-(aq) + 120.0 kJ
Option #2:
Ramon chimes in and says that he's also seen other companies using the reaction of quicklime (calcium
oxide) with water.
Ca0(s) + H20(!) → Ca(OH)2(aq) + 63.70 kJ
Option #3:
Tyler says he came across another option in his research, the dissolution of ammonium nitrate in water.
NH, NO, (s) + 25.41 kJ → NH (aq) + NO5 (aq)
Option #4:
Lucia says that she came across an option to0, although it's normally used for MRES (Meals Ready to Eat,
mostly known as military rations), not drinks.
Mg (s) + 2 H20(1) → Mg²*(aq) + 2 OH (aq) + H2(g) + 351.0 kJ
Your team of scientists knows from all of their beverage experience that the perfect temperature to
drink hot cocoa is 77.00 °C. You also know that the drinks will be stored at 15.00 °C on the train. Each
can will hold 210.0 ml of cocoa beverage.
2. How much heat will need to be produced to warm a can of cocoa from 15.00 °C to 77.00 °C?
Give your answer in kJ. (dcocoa = 1.06 g mL-1; Ccocoa = 3.900 Jg1 °c)
52.824KJ
toxs no
Transcribed Image Text:3. How much reactant (ignoring water) will you need to warm each can of cocoa by the amount
you found in Question 2? Give your answers in grams.
Option #1:
Amount of CaCl2:
Option #2:
widh
Amount of CaO:
Option #3:
Amount of NH,NO3;
Option #4:
Amount of Mg:
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