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
kykrilka [37]
3 years ago
13

23.6 g of calcium chloride (110.98) is dissolved in water in a calorimeter. T rose from 25.0°C to 38.7°C. Heat capacity of solut

ion & calorimeter = 1258 J/°C. What is enthalpy change when 1 mol CaCl2 dissolves?
Chemistry
1 answer:
Soloha48 [4]3 years ago
5 0

Answer:

Enthalpy Change when 1 mole CaCl₂ dissolves

= - 81.13 kj/mole

Explanation:

Given information

    Mass of CaCl₂ = 23.6 g

Temperature changes from 25.0°C to 38.7°C

Heat capacity of solution & calorimeter (C) = 1258 J/°C

We know               Q = C x ΔT

                   ⇒ Heat released =  1258 x (38.7 - 25)

                                                = 1.7234 x 10⁴ J

                                                = 17.2 Kilo-joule

Thus 23.6 g is equivalent to 1.7234 x 10⁴ J or 17.2 Kilo-joule  of heat energy

Molar mass of calcium chloride (110.98)

Mole =\frac{Mass}{Molecular mass} = \frac{23.6}{110.98}  =0.212 mole

Enthalpy Change when 1 mole CaCl₂ dissolves

                      = \frac{-17.2}{0.212} kj/mol = -81.13 kj/mole

You might be interested in
Cracking the periodic table code why aren't the elements listed in alphabetical order answer key
finlep [7]

The elements in the periodice table are not listed in alphabetical order, because the arragement in rows (periods) and columns (groups or familes), in increasing order of atomic number (number of protons of the atoms) permits to explain similarities among the elements, trend in some properties, and even predict properties of unknown elements.


For example, the elements of the first group (family), called alkaline metals, all have 1 valence electron, have similar physical properties (ductibility, malleability, luster, thermal and electricity conductivity), react in similar way with water, show a trend in the atomic radii and in the ionization energy.


You can tell similar stories for other groups like, alkalyne earth metals, halogens and noble gases.


You can also tell trends in electroneativities, and atomic radii, for a row of elements, as per the order they are in the row.


So, the current array resulted very helpul for chemists to explain and predict the behavior and properties of the elements.

4 0
3 years ago
Read 2 more answers
What is the correct answer please
Anestetic [448]

Answer:

I think it's the second answer --If you increase the acidity..

I hope answer I can answer your question!

7 0
3 years ago
(20 Points) If you use a 40x objective to magnify a slide, the image you see through the eyepiece will be magnified:
lisabon 2012 [21]
B. 40 times
Please mark as brainliest.
7 0
3 years ago
Read 2 more answers
A student dissolves 73 g of sodium nitrate, NaNO3, in 100 mL of water and observes a clear, colorless
ohaa [14]
I 90% sure that it would be supersaturated
4 0
3 years ago
#1: The element that loses electrons in a chemical reaction is said to have been which of the following?
Mrrafil [7]
#1: The element that loses electrons in a chemical reaction is said to have been which of the following? A. reduced

B. oxidized

C. combusted

D. rusted

**idk, is it reduced or oxidized??

Answer: oxidized. The element that loses electrons increases its oxidation number (becomes more positve or less negative) and this is oxidation.


Which type of reaction occurs if one element gains electrons and another loses electrons?

A. combustion

B. synthesis

C. oxidation-reduction

D. double-displacement

**my answer: C

Yes, oxidation-reduction

#3: What is the oxidation number for phosphorus in H4P2O7?

A. +5

B. +3

C. +1

D. - 1

**my answer: A. +5

This is the way to calculate it 4(+1) + 2x + 7(-2) = 0 => x = +5



#4: What is the oxidation number for phosphorus in Na2HPO3?

A. +5

B. +3

C. +1

D. - 1

**my answer; B. +3

is that right??

Right

2(+1) + 1 + x + 3(-2) = 0 => x = 6 -1 -2 = 3 (positive)
5 0
3 years ago
Read 2 more answers
Other questions:
  • How many moles of PBr3 contain 3.68 x 10^25 bromine atoms?
    11·2 answers
  • Condensation refers to the process when
    9·1 answer
  • What effect would an isotonic solution have on the egg?
    13·1 answer
  • According to cell theory, what do these four organisms have in common? A) They are made of one or more cells. B) They must under
    12·1 answer
  • Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 14.0 atm. Calculate the work, w , if the gas exp
    9·1 answer
  • What is the symbol of the element that is classified as an alkali metal and is in period 4?
    14·1 answer
  • 2 HBr(g)+O2(g)—>H2O2(g)+Br2(g)
    12·1 answer
  • What makes it possible
    12·2 answers
  • A sample of propane (C3H8) has a mass of 0. 47 g. The sample is burned in a bomb calorimeter that has a mass of 1. 350 kg and a
    14·1 answer
  • How do you revive a person
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!