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Neporo4naja [7]
2 years ago
13

4. How many moles of KBr are found in 3 Liters of 0.4 M solution?

Chemistry
1 answer:
Allisa [31]2 years ago
4 0

There are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.

<h3>HOW TO CALCULATE NUMBER OF MOLES?</h3>

The number of moles of a substance can be calculated by multiplying the molarity by the volume.

No. of moles = Molarity × volume

According to this question, 3L of a KBr solution are contained in a 0.4M.

no. of moles = 3L × 0.4M = 1.2moles

Therefore, there are 1.2 moles of KBr found in 3 Liters of 0.4 M solution.

Learn more about no. of moles at: brainly.com/question/14919968

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How are the different colors generated by the flames? A. proton transitions B. reactions between different atoms C. electronic t
attashe74 [19]

Answer: C

Explanation:

According to Neils Bohr, atoms contain electrons which are arranged in energy levels. The energy levels proceed from the lowest to the highest. When energy is supplied to an atom,it moves from lower to higher energy levels. The higher energy level is known as the excited state. Excited states are short lived and atoms quickly return to ground state with emission of the absorbed energy in the form of visible light. This visible light must have one of the seven colours observed in the visible spectrum; Red, orange, yellow, indigo, blue, green, violet. Energy required for this excitation is supplied by heating the substance in a flame.

4 0
3 years ago
The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound, C5H10O
vova2212 [387]

Answer:The functional groups in an organic compound can frequently be deduced from its infrared absorption spectrum. A compound, C5H10O2, exhibits strong, broad absorption across the 2500-3200 cm^1 region and an intense absorption at 1715 cm'^-1. Relative absorption intensity: (s)=strong, (m)-medium, (w) weak. What functional class(cs) docs the compound belong to List only classes for which evidence is given here. Attach no significance to evidence not cited explicitly. Do not over-interpret exact absorption band positions. None of your inferences should depend on small differences like 10 to 20 cm^1. The functional class(es) of thla compound is(are) alkane (List only if no other functional class applies.) alkene terminal alkyne internal alkyne arene alcohol ether amine aldehyde or ketone carboxylic acid ester nitr

3 0
2 years ago
8. How many atoms of cobalt are in a 0.39 mole sample of CoC
Debora [2.8K]

8.98

×

N

A

 

cobalt atoms

Explanation:

N

A

,

Avogadro's number

specifies  

6.0221

×

10

23

individual particles. It is simply another collective number like a dozen, or a score, or a gross.  

N

A

has the property that  

6.0221

×

10

23

individual cobalt atoms has a mass of  

58.93

⋅

g

. How did I know that? Did I have it memorized?

So the quantity is  

≈

 

54

×

10

23

cobalt atoms.

3 0
2 years ago
For many purposes we can treat ammonia NH3 as an ideal gas at temperatures above its boiling point of −33.°C. Suppose the temper
Keith_Richards [23]

Answer:

The new pressure will be 0.225 kPa.

Explanation:

Applying combined gas law:

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1\text{ and }V_1 are initial pressure and volume at initial temperature T_1.

P_2\text{ and }V_2 are final pressure and volume at initial temperature T_2.

We are given:

P_1=0.29 kPa\\V_1=V\\P_2=?\\V_2=V+50\% of V=1.5 V

T_1=-25^oC=248.15 K

T _2 = 16^oC=289.15 K

Putting values in above equation, we get:

\frac{0.29 kPa\times V}{248.15 K}=\frac{P_2\times 1.5V}{289.15 K}

P_1=0.225 kPa

Hence, the new pressure will be 0.225  kPa.

4 0
3 years ago
Which of the following symbolic representations of matter signifies a mixture of elements?
andreev551 [17]
D only..

A is pure compound
B is mixture of compound and element
C is mixture of compounds
D is mixture of elements
7 0
3 years ago
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