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
Mamont248 [21]
3 years ago
13

According to the graph, how much Potassium bromide can be dissolved in 100 g of warer at 40C?

Chemistry
2 answers:
xenn [34]3 years ago
6 0
At 40 degrees Celsius, approximately 78 grams of potassium bromide can be dissolved.
coldgirl [10]3 years ago
3 0

Answer:

77.8 g potassium bromide can be dissolved in 100 grams of water at 40°C.

Explanation:

In a given a line of KBr is straight. So ,from this we see that:

At 45 degree Celsius 80 grams of KBr is soluble in 100 grams of water.

At 90 degree Celsius 100 grams of KBr is soluble in 100 grams of water.

Slope from these point comes out to be : m

(45,80) , (90,100) :

m=\frac{100 - 80}{90 - 45}=\frac{20}{45}

According to question we want to determine the mass of KBr soluble in 100 grams of water at 40 degree Celsius. Let the mass of KBr at that temperature be y.

(40, y) , (45,80) :

Slope of the straight line as calculated above = m

m=\frac{20}{45}=\frac{80-y}{45-40}

y = 77.77777 ≈ 77.78 g

77.8 g potassium bromide can be dissolved in 100 grams of water at 40°C.

You might be interested in
How many calories of heat are required to raise the temperature of 1.00kg of water from 10.2 degrees Celsius to 26.8 degrees Cel
Vika [28.1K]

Answer:

Explanation:

we know that specific heat is the amount of heat required to raise the  temperature of substance by one degree mathmeticaly

Q=mcΔT

ΔT=T2-T1

ΔT=26.8-10.2=16.6

C for water is 4.184

therefore

Q=1.00*4.184*16.6

Q=69.4 j

now we have to covert joule into calorie

1 calorie =4.2 j

x calorie=69.4 j/2

so 69.4 j =34.7 calorie thats why 34.7 calorie heat is required to raise the temperature of water from 10.2 to 26.8 degree celsius

6 0
2 years ago
What chemical changes happen at school
kykrilka [37]

Burning, cooking

Explanation:

Chemical changes that happens in school are:

Cooking of meals

 Burning of wastes

 Chemical reactions in laboratories

Rusting of iron used in construction

  • A chemical change is a change that produces new kinds of substances.
  • These changes are usually accompanied by energy and mass changes.
  • Most of such changes are not reversible.

Chemical changes are driven by change in chemical properties of matter.

In a school, iron components might begin to rust. This is a chemical change.

learn more:

Chemical change brainly.com/question/9388643

#learnwithBrainly

8 0
2 years ago
If measurements of a gas are 100L and 300 kilopascals and then the gas is measured a second time and found to be 75L, describe w
Tanya [424]

Answer:

The pressure of the gas increased (if temperature remained constant).

The Boyle's law supports this observation.

Explanation:

The initial measurements of the gas are given as;

volume = 100 L

Pressure = 300 kpa

The second measurement is given as;

Volume = 75 L

The second reading implies that the volume of the gas has decreased. If the temperature of the gas remained constant, then the pressure must have increased according to the Boyle's law;

At constant temperature, the pressure of a given mass of an ideal gas is inversely proportional to its volume.

4 0
2 years ago
Scenario: You are testing two different
chubhunter [2.5K]

Answer:1 × 10-8 M

Explanation:

5 0
2 years ago
Read 2 more answers
Given these reactions, X ( s ) + 1 2 O 2 ( g ) ⟶ XO ( s ) Δ H = − 668.5 k J / m o l XCO 3 ( s ) ⟶ XO ( s ) + CO 2 ( g ) Δ H = +
qwelly [4]

<u>Answer:</u> The \Delta H^o_{rxn} for the reaction is -1052.8 kJ.

<u>Explanation:</u>

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.

The given chemical reaction follows:

X(s)+\frac{1}{2}O_2(g)+CO_2(g)\rightarrow XCO_3(s)      \Delta H^o_{rxn}=?

The intermediate balanced chemical reaction are:

(1) X(s)+\frac{1}{2}O_2(g)\rightarrow XO(s)    \Delta H_1=-668.5kJ

(2) XCO_3(s)\rightarrow XO(s)+CO_2     \Delta H_2=+384.3kJ

The expression for enthalpy of the reaction follows:

\Delta H^o_{rxn}=[1\times \Delta H_1]+[1\times (-\Delta H_2)]

Putting values in above equation, we get:

\Delta H^o_{rxn}=[(1\times (-668.5))+(1\times (-384.3))=-1052.8kJ

Hence, the \Delta H^o_{rxn} for the reaction is -1052.8 kJ.

7 0
3 years ago
Other questions:
  • The major cause of a warmer planet<br> comes from?
    5·1 answer
  • Why are the testicles outside the body instead of inside?
    6·1 answer
  • Which electrons are the valence electrons of the atom?<br> Helpppppppp
    7·1 answer
  • At a pressure of 9.25×10−14 atm and an ordinary temperature of 300.0 K , how many molecules are present in a volume of 1.10 cm3
    11·1 answer
  • Could someone please help me? You can ignore number 3:)
    7·1 answer
  • How did humans create cow breeds that survive well in cold weather?
    6·1 answer
  • Which part(s) of the reaction 2 HD(g) ⇀↽ H2(g) + D2(g) will be favored by an increase in the total pressure (resulting in compre
    8·1 answer
  • Please help me with this!
    12·2 answers
  • You have a sample containing 2.39 moles of silver. How many atoms of silver are in this sample?
    5·1 answer
  • equal volumes of equimolar aqueous solutions of sodium sulfite and hydroiodic acid are mixed. what net ionic equation describes
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!