1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
umka2103 [35]
3 years ago
10

A cold pack manufacturer has decided to change the chemical in their cold pack from ammonium nitrate to ammonium chloride, a saf

er chemical. The original cold pack formulation used 100.0 g of room temperature (27.0 oC) water and 35.0 g of ammonium nitrate. Assume that the solution has the same density and specific heat capacity of water and that any heat lost to the calorimeter is negligible. The molar enthalpy of solution of ammonium nitrate is 25.7 kJ/mole and for ammonium chloride is 14.8 kJ/mol. Determine the lowest temperature reached during the original formulation.
Chemistry
1 answer:
My name is Ann [436]3 years ago
4 0

Answer: Tfinal = 7.1°C

Explanation:

heat released or absorbed = mass × specific heat capacity × change in temperature

q = m × cg × ΔT  (eqn 1)

Note:  ΔT = (Tfinal - Tinitial)

(q = ? ΔHsoln=25.7kJ/mole = 25700J/mole; mass of solution, m = 100 + 35g = 135g; cg = specific heat capacity of water  = 4.18 J°C-1g-1; ΔT = ? masss of solute, NH4NO3 = 35g, molar mass of solute, NH4NO3 = 80g)

molar enthalpy of solution, ΔHsoln <em> = heat absorbed or released ÷ moles of solute, </em><em>n</em>

ΔHsoln = q ÷ n

q = ΔHsoln × n

<em>moles solute</em>, n = mass solute (g) ÷ molar mass solute (g mol-1)

moles of solute, n = 35g/80g/mol = 0.4375 moles

q = 25700J/mol × 0.4375 mol = 11243.75J

From equation 1 above, ΔT = q / (m × cg) = 11243.75J / (135 × 4.18 J°C-1g-1) = 19.9°C

Since the reaction is endothermic, Tinitial > Tfinal, therefore, Tfinal = Tinitial - ΔT = 27 - 19.9 = 7.1°C

You might be interested in
Drag the item from the item bank to its corresponding match.
ozzi

Answer:

These are the elements or compounds that enter into a chemical reaction: Reactants

These are the substance(s) formed in a chemical reaction: Products

These are the reactants in the chemical equation C6H1206 +602 --> 6CO2 + 6H20: C6H1206 and 602

These are the reactants in the chemical equation 6 CO2 + 6H2O --> C6H1206 + 6 02: 6 CO2 + 6H2O

These are the reactants in the chemical equation 2 H2 + 02 --> 2 H2O: 2H2 and O2

These are the reactants in the chemical equation 2 H2O --> 2 H2 + O2: 2H2O

4 0
3 years ago
I’m 13 if I did 100 reps of 5 types of push-ups will it build muscle in arms and chest
ra1l [238]
Hi yes bestie just make sure you eat enough so that you can actually build the mussel
8 0
3 years ago
How does removing thermal energy from liquid water affect the molecules in the water?
galina1969 [7]

Answer:

For deposition to happen, thermal energy must be removed from the gas. ... As water vapor loses thermal energy, it changes into solid frost. States of Water. Water is the only substance that exists naturally as a solid, a liquid, and a gas within Earth's temperature range.

Explanation:

3 0
3 years ago
How many milliliters of a 3.0 M HCL solution are required to make 250.0 milliliters of 1.2 M HCL
tiny-mole [99]
You can use M x V = M' x V'

3 x V = 250 x 1.2

V = 100 ml
5 0
3 years ago
What causes the sugar to dissolve in water?
vaieri [72.5K]

Answer:

Sugar dissolves in water because energy is given off when the slighty polar sucrose molecules form intermoleeular bonds with the polar water molecules.

Explanation:

3 0
2 years ago
Read 2 more answers
Other questions:
  • Which of the following statements about minerals is false?
    8·1 answer
  • Which statement is true?
    9·2 answers
  • Why do tropical cyclones spawn around ? please include 5 sentences
    15·1 answer
  • Such high amounts of pressure cause this layer to remain in a __________ state of matter even though the nickel and iron are at
    8·1 answer
  • 8. An atom has 9 protons, which element is it?​
    14·2 answers
  • State and explain the three laws of chemical combination​
    10·1 answer
  • Uses of noble gases with description please. thanks
    9·1 answer
  • A molecule of composition is replicated in a solution containing unlabeled (not radioactive) GTP, CTP, and TTP plus adenine nucl
    12·1 answer
  • How many sig figs does 0.007 have
    14·1 answer
  • ​Bbsbsjsjsjwjwjwjwjehhehehe
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!