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
Identify and name the functional group present<br> CH4
Mashcka [7]
Methane has the alkane functional group, so the name is composed of meth- for the carbon chain, and –ane for the alkane functional group
5 0
2 years ago
What is the mass of 8 moles of sodium (Na) atoms?
omeli [17]
A .

1 mol of sodium na atoms -22.99
22.99 x 8 =183.92

Closest answer
6 0
2 years ago
Which is the isoelectronic of Na​
postnew [5]

Mg- is the isoelectronic of Na

6 0
3 years ago
What step usually comes last when solving numeric problems
Lilit [14]
No mathematics the most common way of solving an equation will be PEMDAS so the answer for your question will most likely be subtraction.
6 0
3 years ago
A container of a mixture of 4 gases has a total pressure of 35.7 kPa. Gas A has a partial pressure of 7.8kPa. Gas B has a partia
Maurinko [17]

Answer:

partial pressure of gas D Pd = 15.5 kPa

Explanation:

As per the Dalton's law of partial pressure, in a mixture, pressure exerted by each gas when summed gives the total partial pressure exerted by mixture.

P(Total) = P1+P2+P3.....

Given P(Total) = 35.7 kPa

Partial pressure of gas A Pa = 7.8 kPa

Partial pressure of gas B Pb = 3.7 kPa

Partial pressure of gas C Pc =  8.7 kPa

There, Partial pressure of gas D Pd = P(Total) -(Pa+Pb+Pc)

Pd = 35.7-(7.8+3.7+8.7) = 35.7-20.2 kPa = 15.5 kPa

Therefore, partial pressure of gas D Pd = 15.5 kPa

4 0
3 years ago
Other questions:
  • Camphor is reduced to isoborneol by sodium borohydride in ethanol. The instructions for safe disposal of the chemical waste gene
    11·2 answers
  • The energy needed to melt 1 g of a substance is called the
    5·1 answer
  • RED LIGHT EMITTED BY A LASER HAS A WAVELENGTH OF 588 NANOMETERS?WHAT IS ITS FREQUENCY?
    5·1 answer
  • A cubic object has a volume of 250 cm. What is its density if its mass is 5 points<br> 257.3 g?
    7·1 answer
  • Let me know the answer to this oneeee
    13·1 answer
  • What will be the final temperature when a 25.0 g block of aluminum (initially at 25 °C) absorbs 10.0 kJ of heat? The specific he
    5·1 answer
  • What force keeps protons and neutrons together?
    12·1 answer
  • Use the balanced equation below to answer the question that follows
    13·1 answer
  • HELP ! DUE IN 41 MINUTES!<br> WILL GIVE BRAINLISIT!!!!!!
    6·1 answer
  • I need help with chem. How do I know if this is balanced ?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!