The molarity of a substance is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is expressed as:
[tex]Molarity = \frac{mole}{volume }[/tex]
From the question given above, the following data were obtained:
Molarity of KCl = 2.45 M
Mole of KCl = 0.5 mole
Volume =?The volume of KCl needed can be obtained as follow:
[tex]Molarity = \frac{mole}{volume }\\\\2.45 = \frac{0.5}{Volume }[/tex]
Cross multiply
2.45 × Volume = 0.5
Divide both side by 2.45
[tex]Volume = \frac{0.5}{2.45}\\[/tex]
Volume = 0.20 LTherefore, 0.20 L is needed to make the solution.
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A compound consists of 14.6% carbon and 85.4% chlorine by mass. What is its empirical formula?
Answer:
[tex]CCl_{2}[/tex]
Explanation:
When calculating an empirical formula from percentages, assume you have a 100g sample. This allows you to convert the percentages directly to grams, because X % of 100g is X grams.
So:
14.6% C = 14.6g C, 85.4%Cl = 85.4g Cl
The next step is to divide each mass by their molar mass to convert your grams to moles.
14.6g/12.01 = 1.22 mol
85.4g/35.45= 2.41 mol
Then you will divide all of your mol values by the SMALLEST number of moles. This gives you whole numbers that are the mole ratio (subscripts) of the empirical formula.
1.22 mol/1.22 mol = 1
2.41 mol/1.22 mol = 2
So the empirical formula is
[tex]CCl_{2}[/tex]
The empirical formula of the compound is CCl2.
HOW IS EMPIRICAL FORMULA CALCULATED:
Empirical formula of a compound is the smallest ratio of elements contained in that compound. The steps for calculating the empirical formula are as follows:14.6% carbon and 85.4% chlorine by mass means the compound has 14.6g of C and 85.4g of ClFirst, we divide each mass by their respective molar mass:C = 14.6g ÷ 12g/mol = 1.22mol
Cl = 85.4g ÷ 35.5g/mol = 2.41mol
Next, we divide each mole value by the smallest value:C = 1.22mol ÷ 1.22 = 1
Cl = 2.41mol ÷ 1.22 = 1.97
Approximately, the carbon to chlorine ratio is 1:2, hence, the empirical formula of the compound is CCl2.
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What is the molality of a solution of 0.25 moles of sucrose in dissolved in enough water to make 4.00 liters of water?
Hey I'm Chloe Can you Help me Thanks.
Name 5 different foods with carbohydrates.
Why does a feather fall slower than a rubber ball? How could you make them hit
the ground at the same time?
Answer:
Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and a rubber ball dropped together. Air resistance causes the feather to fall more slowly, while the ball falls more fast.
What is a food web?
A. A group of animals
B. A producer and consumer relationship
C. A food chain with two levels
D. How several food chains are related
Answer:
D. How several food chains are related
Explanation:
HELP ASAP PLEASE 2H2+ O2 =2H2O, how many moles of water is produced if there is 10gm of O2 gas used?
Answer:
6.25 x 10^-4 moles H2O
Explanation:
moles H2O = 10 x 10^-3 g O2 x (1 mol O2/MM O2) x (2 moles H2O/ 1 mol O2) =
= (10^-2 / 32) x 2 = 6.25 x 10^-4 moles H2O
conversion factor 2moles H2O = 1 mol O2
MM O2 = 32g/mol
mass O2 = 10 mg = 10 x 10^-3 g
Given the balanced equation representing a reaction:
2NO + 0, → 2NO, + energy
The mole ratio of NO to NO2 is
A)
1 to 1
B)
2 to 1
C)
3 to 2
D)
5 to 2
What is the function of the right side of the heart?
takes in oxygen rich blood from the lungs
carries oxygen and nutrients from the arteries to the tissues
releases oxygen rich blood to the veins
takes in blood from the body that has no oxygen
What is the molar mass of Zn(NO3)2 ?
Answer:
molar mass of zn( no3) 2
is 189.36 g/ mol
Will mark brainly
ASAP
Answer:
A. Shivering
Explanation:
This is the job of the excretory system. You remove waste as a gas (carbon dioxide), as a liquid (urine and sweat), and as a solid. Excretion is the process of removing wastes and excess water from the body. Recall that carbon dioxide travels through the blood and is transferred to the lungs where it is exhaled.
Na2SO4(aq) + CaCl2(aq) --> CaSO4(s) +
2NaCl(aq) is an example of which type of
reaction?
decomposition
synthesis
single replacement
double replacement
Answer:
double replacement
Explanation:
A sample of helium gas has a volume of 620. Ml at a temp of 500 K. If we decrease the temperature to 100K while keeping the pressure constant what will the new volume be?
Answer:
A sample of helium gas has a volume of 620mL at a temperature of 500 K. If we ... to 100 K while keeping the pressure constant, what will the new volume be?
Explanation:
A sample of helium gas has a volume of 620. Ml at a temp of 500 K. If we decrease the temperature to 100K while keeping the pressure constant 124 ml will the new volume be.
What is volume ?Volume is a measurement of three-dimensional space that is occupied. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected.
The capacity of an object is measured by its volume. For instance, a cup's capacity is stated to be 100 ml if it can hold 100 ml of water in its brim. The quantity of space occupied by a three-dimensional object can also be used to describe volume.
According to Charles' Law, at constant pressure,
V1 / T1 = V2 / T2
V1 = 620 ml and T1 = 500K, V2 = ? , T2 = 100K
620 ml / 500K = V2 / 100K
V2 = ( 620 ml ) ( 100K ) / 500K
Volume = 124 ml
Thus, If we decrease the temperature to 100K while keeping the pressure constant 124 ml will the new volume be.
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help plz 8th grade science
Answer:
B
Explanation:
Brainlest is apprciatedddddddddddd
What is the name of FeO4
Answer:
Ferrate (VI)
Explanation:
In this lab, you will use a precise scale and heat to identify the mole ratio of an unidentified hydrate. Write an investigative question that you can answer by doing this experiment.
Answer:
How can drying a hydrate help you determine its mole ratio of water to salt?
Explanation:
When we are investigating the mole ratio of a hydrate by heating we can have some scientific questions to solve here, like how much heat energy is needed to dry the hydrate of specified quantity, similarly how the evaporation helps to determine the mole ratio?
What are hydrates?Some compounds easily absorbs water molecules into them and forms hydrates that are compounds associated with water molecules. The property getting moisture easily is called deliquescence.
There are many compounds which able to form hexahydrates, penta hydrates, dihydrates etc. The mole ratio with water depends on the nature of the compound and mostly to the bond type.
By heating the hydrates can be dried by evaporation of water. But the temperature used to evaporate varies with the water content. Thus, question we can have here, is how heating helps to find mole ratio and how heat energy is used to make it dry.
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URGENTTTTT What is the correct formula when Al+3 combines with CrO4-2
A. Al2CrO43
B. Al2(CrO4)3
C. Al4(CrO)3
Which two are incorrect and why?
Please help me due tomorrow
Explanation:
this are answers
On a coordinate plane, which single transformation could map point A (3,-4) onto point A' (1.5,-2)? *
Answer: A dilation with rule: [tex](x,y)\to(\dfrac12x,\dfrac12y)[/tex]
Explanation:
A dilation is a non-rigid transformation that creates an image that is the same shape as the original but has a different size.
It uses a scale factor k such that
[tex](x,y)\to(kx,ky)[/tex]
(x,y)= coordinates of original figure
(kx,ky) = corresponding coordinate in the image.
To transform: A (3,-4) onto point A' (1.5,-2).
Using scale factor k= [tex]\dfrac12[/tex], we have
[tex]A(3,-4)\to A'(\dfrac12\times3, \dfrac12\times-4)=A'(1.5,-2)[/tex]
Required rule: [tex](x,y)\to(\dfrac12x,\dfrac12y)[/tex]
If you can solve both
Will mark brainly
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Answer:
1. answer is subcutaneous tissue 2. answer is spleen
Explanation:
The subcutis is also known as the hypodermis or subcutaneous layer, and functions as both an insulator, conserving the body's heat, and as a shock-absorber, protecting the inner organs.
Excretory Organs. Organs of excretion include the skin, liver, large intestine, lungs, and kidneys. Together, these organs make up the excretory system.
Answer:
the answer is Subcutaneous Tissue
Explanation:
and the second one is Intestine
Explain the role light plays on the rate
of photosynthesis.
Answer:
The process of photosynthesis occurs when green plants use the energy of light to convert carbon dioxide (CO2) and water (H2O) into carbohydrates. Light energy is absorbed by chlorophyll, a photosynthetic pigment of the plant, while air containing carbon dioxide and oxygen enters the plant through the leaf stomata.
The surface temperature of a white dwarf is higher than a red supergiant. True or False
Answer:
True.
Explanation:
Which best describes the relationship between the circulatory system and the respiratory system?
The circulatory system is the transport system for the respiratory system.
The respiratory system is the transport system for the circulatory system.
The circulatory system diffuses red blood cells into the respiratory system to pick up oxygen.
The respiratory system transfers hemoglobin to the red blood cells of the circulatory system.
Answer:
its a
Explanation:
yw
The respiratory and circulatory systems work together to maintain the homeostasis of the human body. The circulatory system is the transport system for the respiratory system. The correct option is A.
What is respiratory system?The network of organs and tissues which help us to breathe is defined as the human respiratory system. The main function of this system is to introduce oxygen into the body and to expel carbon dioxide from the body.
The human circulatory system consisting of arteries, veins and capillaries provide all the essential nutrients, minerals and hormones to the various parts of the body.
The respiratory system does not work alone in transporting oxygen through the body. The oxygen taken in from the respiratory system moves into blood vessels that then circulate oxygen rich blood to tissues and cells.
Thus the correct option is A.
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What is the mass of a 5.00 cm^3 piece of copper having a density of 8.96 g/cm^3
Answer:
44.8 g
Explanation:
Density = mass / Volume
Mass = density x Volume = 8.96x 5 = 44.8 g
The following equation is balanced: 4 H3PO4 --> P4O10 + 6 H2O
Group of answer choices
True
False
Answer:
True
Explanation:
The given chemical equation is balanced as it has equal number of atoms of each element on both sides.Hence it is true.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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PLS HELP MY HOMEWORK IS DUE IN AN HOUR
How many moles of Fe2O3 can be made from 50 moles of Fe?
Answer: Synthesis
0.84 moles of oxygen
25 moles of [tex]Fe_2O_3[/tex]
Explanation:
The balanced chemical equation is:
[tex]4Fe+3O_2\rightarrow 2Fe_2O_3[/tex]
This is a synthesis reaction as one product is formed by combination of two reactants.
According to stoichiometry :
a. 2 moles of [tex]Fe_2O_3[/tex] require = 3 moles of [tex]O_2[/tex]
Thus 0.56 moles of [tex]Fe_2O_3[/tex] require=[tex]\frac{3}{2}\times 0.56=0.84moles[/tex] of [tex]O_2[/tex]
b. 4 moles of [tex]Fe[/tex] give = 2 moles of [tex]Fe_2O_3[/tex]
Thus 50 moles of [tex]Fe[/tex] give =[tex]\frac{2}{4}\times 50=25moles[/tex] of [tex]Fe_2O_3[/tex]
Convert 300K to degrees Celsius.
Answer these questions to get marked as a BRAINLIEST!!!!
Answer:
c
Explanation:
Answer:
I think ur answer would be C.)
Explanation:
hope this helps <3
A closed flask contains gas at STP. If the temperature is raised to 400 K what will the pressure be in atm?
Answer:
The answer is 1.5 atm
Explanation:
Can someone help me please
The following is what type of reaction: 2Al(s) + 3CuCl2(aq) ---> 2AlCl3(aq) + 3Cu(s)
Answer:
single replacment
Explanation: