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
Sphinxa [80]
2 years ago
12

If 55.0 mL of ethanol (density = 0.789 g/mL) initially at 8.0 ∘C is mixed with 55.0 mL of water (density = 1.0 g/mL) initially a

t 28.4 ∘C in an insulated beaker, what is the final temperature of the mixture, assuming that no heat is lost? (CEtOH=2.42J/(g⋅∘C).) Express the temperature in degrees Celsius to three significant figures.
Chemistry
1 answer:
babymother [125]2 years ago
3 0

Answer:

T = 45.509 °C

Explanation:

  • Q = mCΔT

EtOH:

∴ m EtOH = (55.0 mL)*(0.789 g/mL) = 43.395 g

∴ CEtOH = 2.42J/g°C

∴ T1 = 8.0 °C

H2O:

∴ m H2O = (55.0mL)*(1.0 g/mL) = 55 g

∴ C H2O = 4.186 J/g°C

∴ T1 = 28.4 °C

final temperature of the mixture (T):

⇒ Q EtOH = Q H2O

⇒ (43.395 g)(2.42 J/g°C)(T - 8.0°C) = (55.0 g)(4.186 J/g°C)(T - 28.4°C)

⇒  105.016 T - 840.127 = 230.23 T - 6538.532

⇒ 6538.532 - 840.127 = 230.23 T - 105.016 T

⇒ 5698.405J = (125.214 J/°C)( T )

⇒ T = 45.509 °C

You might be interested in
<img src="https://tex.z-dn.net/?f=%5Csf%5Clarge%20%5Cgreen%7B%5Cunderbrace%7B%5Cred%7BQuestion%7D%7D%7D%3A" id="TexFormula1" tit
Lesechka [4]

Answer:

Transition elements are elements which have partially filled d-orbitals and form at least one or more stable ions.

6 0
3 years ago
What was Thompson’s model of the atom called
shtirl [24]

J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. In Thomson's model, the atom is composed of electrons (which Thomson still called “corpuscles,” though G. J.

4 0
3 years ago
Read 2 more answers
In the process of electrolysis, current can flow through a liquid because A. water molecules become negatively charged. B. hydro
Liula [17]
<span>B. Hydrogen is electrically neutralized in the solution. Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table.</span>
4 0
3 years ago
Read 2 more answers
How many grams of Na2SO4 can be produced from 423.67 g of NaCl?
san4es73 [151]

Mass of  Na2SO4= 514.18 grams

<h3>Further explanation</h3>

Given

423.67 g of NaCl

Required

mass of  Na2SO4

Solution

Reaction

2NaCl + H2SO4 → Na2SO4 + 2HCl

mol NaCl :

= 423.67 g : 58.5 g/mol

= 7.24

From the equation, mol Na2SO4 :

= 1/2 x mol NaCl

= 1/2 x 7.24

= 3.62

Mass  Na2SO4 :

= 3.62 mol x 142,04 g/mol

= 514.18 grams

4 0
3 years ago
23) What is the volume of 2.454 x 1024 atoms of nitrogen gas at STP?
earnstyle [38]

Answer:

d) V =  91.3 L

Explanation:

Given data:

Volume of nitrogen = ?

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Number of atoms of nitrogen = 2.454×10²⁴ atoms

Solution:

First of all we will calculate the number of moles of nitrogen by using Avogadro number.

1 mole = 6.022×10²³ atoms

2.454×10²⁴ atoms × 1 mol / 6.022×10²³ atoms

0.407×10¹ mol

4.07 mol

Volume of nitrogen:

PV = nRT

1 atm × V = 4.07 mol ×0.0821 atm.L /mol.K ×273.15 K

V =  91.3 atm.L /1 atm

V =  91.3 L

3 0
3 years ago
Other questions:
  • Gimme more info on natural resources
    10·1 answer
  • Which method reduces carbon dioxide emissions by storing carbon dioxide for a long time?
    10·2 answers
  • How many moles of gas sample are 5.0 L container at 373K and 203kPa
    5·1 answer
  • Consider a three sequentially stepped process named as Process A, Process B and Process C. Input comes into Process A. Output fo
    14·1 answer
  • What is the correct name for the compound with the formula CrPO4 and why
    8·2 answers
  • can anyone draw out the answer for me please because I'm confused your supposed to make a lewis dot structure out of the lines a
    6·1 answer
  • Simplified. The absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun
    8·1 answer
  • What is the metric prefix for the factor 10^-9?
    13·1 answer
  • Please help! I will give brainilist........
    13·1 answer
  • 21.10g of NaOH and Ba3(OH)2 mixture is dissolved water to prepare 1.0dm³ Solution. To neutralize 25.OO mL of this solution needs
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!