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
adoni [48]
3 years ago
7

How much energy is released when 2.25kg of water cools from 99.5°C to 4.2°C? 1000g=1kg; 1000J=1kJ; specific heat of water 4.184J

/g°C. q=mc∆T
Chemistry
1 answer:
vfiekz [6]3 years ago
8 0

Answer:

897154.2 J

Explanation:

Applying,

q = mcΔT.............. Equation 1

Where q = amount of energy released, m = mass of water, c = specific heat capacity of water, ΔT = Change in temperature

From the question,

Given: m = 2.25 kg = 2250 g, c = 4.184 J/g°C, ΔT = (4.2-99.5) = -95.3°C

Substitute these values into equation 1

q = 2250(4.184)(-95.3)

q = -897154.2 J

q =

Hence the amount of heat released is 897154.2 J

You might be interested in
If one adds 0.1 mol of the weak acid hf (pk_a = 3.2) to a solution with a ph = 2, which species would be most abundant and how m
zavuch27 [327]

F^{-} is most abundant and 6310 times more than HF.

<h3>What is a strong and weak acid?</h3>

When an acid is dissolved in water, all of its molecules disintegrate, making the acid powerful.

When an acid is dissolved in water, only a small number of its molecules disintegrate, making the acid weak. Strong acids have a lower pH than weak acids.

The powerful acids include perchloric acid, chloric acid, nitric acid, sulfuric acid, hydrobromic acid, and hydroiodic acid.

Given:

Pka=3..2

pH=7

Let the volume be 1 liter

[HF]=01 M

pH=pka+log \frac{F^{-}}{HF} \\\\7=3.2+log\frac{F^{-}}{HF} \\3.8=log\frac{F^{-}}{HF}\\ \frac{F^{-}}{0.1}=10^{3.8} \\F^{-}=630.95 M

Now,

\frac{F^{-}}{HF}=\frac{630.95}{0.1}\\ =6309.57

F-:HF= 6309.57:1

Therefore, the most abundant is F^{-}and has 6310 times more than HF is F^{-}.

To know more about strong and weak acids, visit: brainly.com/question/12811944

#SPJ4

4 0
2 years ago
Identify the type of error in the following scenario. SCENARIO: A group is trying to find the volume of a given liquid. To do th
7nadin3 [17]

Answer:

Error of parallax it usually occurs when the cylinder is above or below the eye level,and thus resulting in differences In reading the millimeters

5 0
3 years ago
Is the molecule SF4 polar or non polar?
krok68 [10]
S4 is polar molecule
6 0
3 years ago
Which of the following is NOT a limiting factor for the number of possible compounds?
babymother [125]

Answer:

all elements have a different atomic number

Explanation:

Atomic number of element does not affect their reactions with others

6 0
3 years ago
Name the two gases that make up most of the air.<br>​
ddd [48]

Answer:

Air is mostly gas

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.

Explanation:

plz mar k me brainlist

have a nice day

5 0
2 years ago
Read 2 more answers
Other questions:
  • In chemistry class, you are given a density column with golden syrup, water, and oil. Your teacher gives you an unknown substanc
    12·2 answers
  • Which of the following names the quantity and correctly explains why that represents the astronauts weight
    12·1 answer
  • Given 6.98 x 10 4 power grams of iron, calculate the moles of iron present
    15·1 answer
  • Real images can be projected onto a screen.<br> A. True<br> B. False
    13·1 answer
  • 3- Fully folded proteins typically have polar side chains on their surfaces, where electrostatic attractions and hydrogen bonds
    9·1 answer
  • What particles are affecting by strong nuclear forces?
    13·1 answer
  • Which elements are metals? check all that apply. rhenium (re) boron (b) lithium (li) krypton (kr) phosphorus (p) mercury (hg)?
    15·2 answers
  • Write the condensed formula from left to right, starting with (CH3)x where x is a number.
    10·1 answer
  • Gas law questions 2-5. Will give brainliest.
    12·1 answer
  • 10. Liquid changing to gas only at the surface is called
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!