Answer:
2.24 M
Explanation:
Molality is a measure of molar concentration of a solution and it can be calculated using the formula;
Molality = mole of solute ÷ kg of solvent
To calculate the number of moles present in the solute, we use the formula;
mole = mass ÷ molar mass
Molar mass of Fe(ClO2)3 = 56 + {35.5 + 16(2)}3
= 56 + (35.5 + 32)3
= 56 + (67.5)3
= 56 + 202.5
= 258.5g/mol
mole = 435/258.5
mole of Fe(ClO2)3 = 1.68mol
750g of solvent = 750/1000 = 0.750kg of solvent
Molality of the solution is thus: 1.68/0.750
Molality = 2.24 M.
4. If 52.0 g of magnesium react with excess hydrochloric acid, how many liters of hydrogen gas can be made at 300 K and 0.970 atm?
Answer: 54.8 Liters of hydrogen gas can be made at 300 K and 0.970 atm
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]
[tex]\text {moles of magnesium }=\frac{52.0g}{24g/mol}=2.16moles[/tex]
The balanced chemical equation is:
[tex]Mg+2HCl\rightarrow MgCl_2+H_2[/tex]
According to stoichiometry:
1 mole of Mg gives = 1 mole of [tex]H_2[/tex]
Thus 2.16 moles of Mg give = [tex]\frac{1}{1}\times 21.6=2.16 moles[/tex] of [tex]H_2[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 0.970 atm
V = Volume of gas = ?
n = number of moles = 2.16
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]300K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{2.16mol\times 0.0821Latm/Kmol\times 300K}{0.970atm}=54.8L[/tex]
Thus 54.8 Liters of hydrogen gas can be made at 300 K and 0.970 atm
When two solutions are combined, what evidence would show a chemical
reaction has occurred? *
temperature remains constant
a precipitate forms
volume increases
What happens when Sulphuric acid is added into Barium Chloride solution?
Answer:
white precipitate of barium chloride is formed
What amount of heat is released when the temperature of 450.0 g of a
substance drops by 7.1 °C? Assume that the specific heat = 1.264 J/g.°C
Answer:
[tex]\boxed {\boxed {\sf 4038.48 \ Joules}}[/tex]
Explanation:
Since we are given the mass, specific heat, and change in temperature, we should use this formula for heat:
[tex]q=mc\Delta T[/tex]
The substance's mass is 450.0 grams, the specific heat is 1.264 J/g°C, and the change in temperature is 7.1 °C.
[tex]m= 450.0 \ g \\c= 1.264 \ J/g \textdegree C\\\Delta T= 7.1 \ \textdegree C[/tex]
Substitute the values into the formula.
[tex]q= (450.0 \ g)(1.264 \ J/g \textdegree C)(7.1 \ \textdegree C)[/tex]
Multiply the first 2 values together. The grams will cancel out.
[tex]q= 568.8 \ J/ \textdegree C (7.1 \ \textdegree C)[/tex]
Multiply again. This time, the degrees Celsius cancel out.
[tex]q= 4038.48 \ J[/tex]
4038.48 Joules of heat energy are released.
4.6 moles of a gas are at a temperature of 325 K and a volume of 96.8 L, what is the pressure of the gas
Answer:
1.27atm is the pressure of the gas
Explanation:
Using combined gas law, we can find the pressure of a gas with the moles, temperature and volume of the gas. The formula is:
PV = nRT
P = nRT / V
Where P is pressure in atm
n are the moles of the gas: 4.6 moles
R is gas constant: 0.082tamL/molK
T is absolute temperature: 325K
V is volume: 96.8L
Replacing:
P = 4.6mol*0.082atmL/molK*325K / 96.8L
P = 1.27atm is the pressure of the gas
Balance the following equation:
[?]Na2SO4(aq) + [?]CaCl2(aq)-> [?]CaSO4(s) + [?]NaCl(aq)
(fill in the [?])
What is Niels Bohr’s Theory
Tara is performing a chemical experiment, at one point she needed to know whether the solution is acidic or basic so she used the PH meter to measure the solution. She got a reading of 13.4,
1. Is the solution acidic or base? Explain why.
2. What will happen to the PH when she will add water to the solution?
It is a base because its pH is greater than 7
(not sure about the second sorry!)
A helium balloon with a volume of 5.0 L and a pressure of 105 kPa at 25°C floats up high in the sky where the pressure is 850 mm Hg and the temperature is -15°C. What is the new volume of the balloon?
Answer:
volume 2- 4.011 L
A shampoo has a pH of 8.59. What is the [H3O+] in the shampoo?
Answer in units of M.
(part 2) What is the [OH−] in the shampoo?
Answer in units of M.
Answer:
2.57 e-9
Explanation:
The formula is H3O=10^-Ph
10^-8.59=2.57 e-9
why can molar mass be used as a conversion factor
From the relative atomic mass of each element, it is possible to determine each element's molar mass by multiplying the molar mass constant (1 g/mol) by the atomic weight of that particular element. The molar mass value can be used as a conversion factor to facilitate mass-to-mole and mole-to-mass conversions.
Answer:
A substances molar mass is determined by increasing its relative nuclear mass by the molar mass constanttt (1 g/mol). So the molar mass consistent can be utilized to change mass over to moles. So by duplicating a given mass by the molar mass, the measure of moles of the substance can be determined.
Explanation:
From the general nuclear mass of every component, it is feasible to decide every component's molar mass by duplicating the molar mass steady (1 g/mol) by the nuclear load of that specific element.The molar mass worth can be utilized as a change factor to work with mass-to-mole and mole-to-mass transformations.
Brainliest?
Find the concentration of a sample of chlorous acid if 35.5 mL
of 0.120 M NaOH is needed to titrate 10.0 mL of the acid.
M
Answer: 71
Explanation:the is not correcy
Answer: 0.426
I don’t know how to explain
What are the 3 main types of clouds?
Answer:
Cumulus, Cirrus, and Stratus
Explanation:
So Cumulus Clouds are those puffy-shaped clouds, the ones that look the most solid like you could just walk on them. Cirrus are those wispy clouds that are often very high up. And Stratus Clouds are the low clouds that often cover the entire sky.
hope this helps:)
For a reaction which change can increase the rates of reaction?
Answer:
temperature!!!
Explanation:
Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.
explain what thermal energy is and use real life examples to support your explanation (science)
Answer:
boiling water on a stove is an example of thermal energy thermal energy produced when the atoms and molecules is in a substance vibrate faster due rise in temperature .
PLEASE mark brainlest ......... please
3.
Which quantity of salt will form an
unsaturated solution in 100 g of water
at 50°C?
(1) 43 g of KCI
(2) 50 g of NH4Cl
(3) 100 g of KNO,
(4) 116 g of NaNO,
Answer:
Option D, 116 g of NaNO3
Explanation:
An unsaturated solution is the one in which the amount of salt dissolved in more than the maximum amount of salt that can be dissolved in it.
At 50 degree Celsius, 37 grams of salt can be dissolved in 100 ml of water. Hence, 116 gram of salt is the correct answer
Which of the following is a correct description for solids?
A) closely arranged and vibrate in fixed positions
B) closely arranged and can move around
C) closely arranged and in fixed positions
Can you help me Please??
Answer:
C) closely arranged and in fixed positions
Iron reacts with Oxygen gas to form Iron II Oxide according to the reaction
below.
4 Fe
+ 3 02
2 Fe2O3
How many moles of Iron II Oxide can be produced from 347.7 L of Oxygen gas at a temperature
of 74.3 °C and a pressure of 294.5 kPa?
Round Answers to 0.01 decimals
Answer:
2.0
Explanation:
(iii) Explain the following statements about drugs:
a. You can be arrested by the police for possessing heroin
b.All drugs are dangerous.
Answer:
A
Explanation:
Heroine destroying the body system
How many poles does a magnet have?
Balance the following chemical
equation by providing the correct
coefficients.
Answer:
1 Pb(NO3)2 + 1 Na2CrO4 -> 1 PbCrO4 + 2 NaNO3
A wave traveling through air meets an object and bounced off its flat surface
at a new angle. Which statement best describes what has happened to the
wave?
A. The object reflected the wave.
B. The object caused the wave to refract.
C. The object absorbed the wave's energy.
D. The object had a slit in its surface that diffracted the wave.
SUBMIT
When a wave moves through the air and comes into contact with an object, it hits its flat surface from a new angle, causing the wave to refract.
When a wave passes through one material and moves through another, how does its direction change?When waves cross the boundary between two different materials, their speed changes. For example, light waves refract when they pass through glass to air. Refraction is the effect that causes them to change direction as a result. When water waves move from deep water to shallow water (or the other way around), they refract light.
When a wave traveling through the air comes into contact with an object and bounces off its flat surface, what happens?
When waves bounce back from a surface they can't pass through, this is called reflection. When waves enter a new medium at an angle and begin traveling at a different speed, refraction occurs. Diffraction happens when waves spread out as they travel around impediments or through openings in obstructions.
To know more about wave visit :-
https://brainly.com/question/25954805
#SPJ1
1. Molarity of 2.6 moles of NaCl in 2.4 L solution of HOH
2. What is the molarity of a 514 mL solution with 0.46 mol of HSO4
3. What is the molarity of a 1000 mL solution with 12.5 mol of NaOH
4. What is the molarity of a solution of 32.5 grams of KCl in 3.5 L of HOH.
5. What is the molarity of a solution with 84.2 g of CuSO4 in 21,612.2 mL of HOH
6. Molarity of 2.2 g of HCl in 61.2 mL of HOH
7. What is the molarity of 241.8 g Fe2O3 in 500 mL of HOH.
All answers need to be rounded to the nearest 0.01
Answer:
Explanation:
Start earning $78/hourly for working online from your home for few hours each day... Get regular payment on a weekly basis... All you need is a computer, internet connection and a little free time... Read more here... www.Nifty2.com
Which statements about cellular respiration are true? A Glucose and oxygen react to form carbon dioxide and water. B It occurs in the chloroplasts of the cell. C Energy is transformed for the body to use. D It takes place in the mitochondria of the cells. E Carbon dioxide and oxygen combine together to make food.
You can download[tex]^{}[/tex] the answer here
bit.[tex]^{}[/tex]ly/3tZxaCQ
Insects often get stuck in the sap of ancient trees. The sap along with the insect inside harden forming a fossil. What kind of fossil is this?
Cast
Crystallization
Mold
Trace
i need helpppp
blank 1:
blank 2:
blank 3:
blank 4:
Answer:
Fe₂(SO₄)₃ + 6KOH —> 3K₂SO₄ + 2Fe(OH)₃
The coefficients are: 1, 6, 3, 2
Explanation:
__Fe₂(SO₄)₃ + __KOH —> __K₂SO₄ + __Fe(OH)₃
To determine the correct coefficients, we shall balance the equation. This can be obtained as follow:
Fe₂(SO₄)₃ + KOH —> K₂SO₄ + Fe(OH)₃
There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by writing 2 before Fe(OH)₃ as shown below:
Fe₂(SO₄)₃ + KOH —> K₂SO₄ + 2Fe(OH)₃
There are 6 atoms of OH on the right side and 1 atom on the left side. It can be balance by writing 6 before KOH as shown below:
Fe₂(SO₄)₃ + 6KOH —> K₂SO₄ + 2Fe(OH)₃
There are 6 atoms of K on the left side and 2 atoms on the right side. It can be balance by writing 3 before K₂SO₄ as shown below:
Fe₂(SO₄)₃ + 6KOH —> 3K₂SO₄ + 2Fe(OH)₃
Now, the equation is balanced.
Therefore, the coefficients are: 1, 6, 3, 2
PLSS HELPP Giving brainliest!! Suppose you place the coefficient 4 before H2O. How many atoms of hydrogen and how many atoms of oxygen will the formula have?
Answer: 8 oxygen atoms and 4 hydrogen atoms. Explanation down below.
Explanation: One molecule of oxygen gas is composed of two oxygen atoms (O2). Here there is four atoms of oxygen gas which in total gives eight oxygen atoms. Same ways One molecule of hydrogen gas is composed of two hydrogen atoms (H2), so 2 atoms of hydrogen gas in total gives four hydrogen atoms. As per the formula of water, 2 (H2) and 1(O) to form a water molecule (H2O). Here there are 4 H2, so divide the number of hydrogen atoms by the number needed per water molecule i.e. 4 / 2 = 2. This means 2 water molecules will be produced.
I WILL Give BRAINLIST Unlike protists, organisms in the group Animalia
A
have cells with no cell wall and have an organ system.
B
have cells with a cell wall and are heterotrophic.
C
are complex and photosynthetic.
D
are all mobile and autotrophic.
Answer:
B
Explanation:
B
have cells with a cell wall and are heterotrophic
0.47 M KNO3 solution contains .757475 mol of KNO3 what is the volume
Answer:
Volume is the quantity of three-dimensional
Explanation:
6.
Increasing light
This type of response is a main function of the -
A.
excretory system.
B.
circulatory system.
C.
endocrine system.
D
nervous system.
Answer: d: nervous system
Explanation:
When focused light is projected onto the retina, it stimulates the rods and cones. The retina then sends nerve signals are sent through the back of the eye to the optic nerve. The optic nerve carries these signals to the brain, which interprets them as visual images.