If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
What is a saturated solution?A saturated solution is a solution in which there is so much solute that if there was any more, it would not dissolve. Its concentration is the same as the solubility at that temperature.
Step 1. Calculate the mass of water.At 10 °C, the solubility is 31.2 g KCl/100 g H₂O.
30 g KCl × 100 g H₂O/31.2 g KCl = 96 g H₂O
Step 2. Calculate the mass of KCl required to prepare a saturated solution at 60 °C.At 60 °C, the solubility is 45.8 g KCl/100 g H₂O.
96 g H₂O × 45.8 g KCl/100 g H₂O = 44 g KCl
Step 3. Calculate the mass of KCl that must be added.44 g - 30 g = 14 g
If 30 grams of KCl is dissolved at 10°C, 14 g of KCl should be added to make a saturated solution at 60 °C.
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How many kJ of heat do you need to raise the temperature of 200 g of Aluminum from 80 °C to 100 °C?
Remember to convert your answer to kJ. Round your answer to two decimal places.
Answer:
0.01
Explanation:
100 -80=20
200/20=10/1000=0.01kj
14. Calculate the mass in grams of oxygen required to react completly with 0.75 moles of Aluminum.
4Al + 302 → 2Al2O3
a. 32 g of Oxygen
b. 18 g of Oxygen
c. 16 g of Oxygen
d. 9.0 g of Oxygen
Moles of O_2:-
0.75(0.75)0.5625molMass of O_2:-
moles(Molar mass)0.5625(32)18gOption B
As per the given balanced reaction, 0.75 moles of aluminum metal requires 0.56 moles of oxygen gas for completely reaction. One mole of oxygen gas is 32 g. Then, mass of 0.56 moles is 18 g.
What is aluminum oxide ?Metals and metal like elements such as aluminum Al are more reactive towards atmospheric oxygen and forms their oxide layers in the metallic surface.
Al₂O₃ is an essential mineral of aluminum formed by the reaction with oxygen as given in the balanced chemical equation. As per this equation, 4 moles of Al requires 3 moles of oxygen for complete reaction.
The number of moles of oxygen required by 0.75 moles of Al is:
(0.75 × 3) /4 = 0.56 moles.
one mole of oxygen weighs 32 g/mol.
mass of 0.56 moles of O₂ = 32 × 0.56 = 18 g.
Therefore, the mass required by 0.75 moles of Al in the reaction is 18 g.
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Chromium reacts with bromine to produce chromium(iii) bromide
The balanced chemical equation for the reaction between chromium and bromine to produce chromium(III) bromide is:
2 Cr + 3 Br2 → 2 CrBr3
This equation shows that two chromium atoms react with three molecules of bromine to form two molecules of chromium(III) bromide.
What is a redox reaction?A redox reaction is a type of chemical reaction that involves the transfer of electrons between reactants. The term "redox" comes from the combination of two processes during the reaction: reduction, which involves the gain of electrons by a reactant, and oxidation, which involves the loss of electrons by a reactant.
Why is the above reaction an example of a redox reaction?The reaction is an example of a redox reaction, where reduction and oxidation occur simultaneously. Chromium is oxidized, while bromine is reduced. The reaction also shows the importance of balancing the number of atoms on both sides of the equation to ensure that the law of conservation of mass is satisfied.
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Calculate the pH of a solution whose pOH is 11.
Answer:
3
Explanation:
pH + pOH = 14
pH + 11 = 14
pH = 3
socraticorgquestionshowdoyoucalculatethephofasolutionwhengiventheohconcentration
Anthony F BRIAN M
As soon as the rope breaks in picture 4, the car continues to roll forward on its own. This motion is BEST explained by which of the following laws? A. AN object in constant motion tends to remain in motion unless acted on by and unbalanced force. B. For every action there is an equal and opposite reaction/ C. An unbalanced force acting on an object will cause the object to accelerate. D. The force of gravity will cause an object to accelerate toward the earth at a constant rate.
Answer:
what is picture 4 you need to show it
Assume you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution. How would this affect the reaction rate?
The reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.
What happen when the vitamin C is added in lower amount?If you added 40.0 mL of Vitamin C stock solution instead of 25.0 mL when preparing Solution, the reaction rate is affected because of the lower amount of reactant for the chemical reaction. If the reactants are present in larger amount then the products are also produced in large concentration.
So we can conclude that the reaction rate is affected if the vitamin C is added in lower quantity due to lower amount of reactants.
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• Calculate the entropy change when 1.00 mol of
water at 0°C freezes to form ice. (AHfus for water
is +6.02 kJmoll)
1
Answer:
the enthalpy change of this is 5.02mol
how many CO grans are produced from 1.80 mol of sulfur dioxide2
Answer:
A mol (approximately)represents the number 6.02 X 10^^23. Mols become useful when we learn that, for any element on the periodic table, 6.02 X 10^^23 atoms of that element have a mass equal to the atomic mass in grams. So, on the periodic table carbon has an atomic mass of 12.011. That means: 12.011 grams of carbon is made up of 6.02 X 10^^23 atoms.
The above question is tricky.
If the question considers 1 molecule of SO2 as a particle, then the answer is 1.80 * 6.02 X 10^^23
If the question considers the S as one particle, and the O2 as 2 more particles, then the answer is: 3 * 1.8 * 6.02 X 10^^23.
Explanation:
hope it helps U
A person is going for a walk in the evening. To make sure that she can be seen walking when it gets dark, she wears a glow stick around her neck. The glow stick can be used as a light source when she bends the stick. Although the stick is sealed, bending the stick allows two chemicals to come in contact and react with each other. During the chemical reaction, light is given off by the glow stick.
When the reaction stops, light is no longer given off. What happens to the mass of the glow stick after the chemical reaction occurs? Explain citing evidence from the prompt and identify the scientific law that supports your explanation.
(give me claim,evidence,reasoning)
From the law of conservation of mass, the mass of the glow stick does not change after the reaction.
Law of conservation of massFrom the law of conservation of mass we know that mass can neither be created nor destroyed but is converted from one form to another. Since the mass of the system must remain unchanged, It then follows that the mass of the glow stick must remian the same.
Therefore, the mass of the glow stick does not change after the reaction following the law of conservation of mass.
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What is radioactive dating in chemistry?
PLEASE HELP!!!
Calculate the normal concentration of a solution containing 20.8 g in 400 ml.
Answer:
52 g/L
Explanation:
First, 400 mL / 1000 = 0.4 L
20.8 g / 0.4 L = 52 g /L
what is safe storage of produced materials
Answer:
Stacking bags and bundles.
Explanation:
Interlock them in rows to ensure they're secure.
Answer:
Material Storage Facilities means an uncovered area used on a permanent basis for outside
Explanation:
Material Storage Facilities means an uncovered area where bulk materials (liquid, solid, granular, etc.) are stored in piles, barrels, tanks, bins, crates, or other means.
Additional Benchmarks for Federal, State, or Municipal Facilities with Incidental Solid De-Icing Material Storage Facilities monitoring under the requirements of subparagraph (D)(ii) above shall not be subject to Benchmark requirements for Chloride or Cyanide.
Directors are fully briefed on all business related matters, risk assessment and new initiatives proposed by the Company.
energy contained in the
and
15. The energy transformation in a flashlight is from
battery to
energy in the circuit, to
energy released by the light bulb.
Answer:
yes of course is true the
Answer this question lol
If a Hh mom has an offspring with a hh dad, what is the probability that the offspring will have a dominant phenotype?
Question 2 options:
20%
10%
50%
40%
Answer:
I think 50%
Explanation:
im not really sure
To what temperature must a sample of helium gas be cooled from 139ºC to reduce its volume from 3.1 L to 0.71 L at constant pressure?
Answer:
To what temperature must a sample of helium gas be cooled from 22.2 degrees C to reduce its volume from 1.00L to 100cm3 ?
Explanation:
The weak ionization constant (Ka)
for H2CO3 is equal to:
A
B
(H2CO3]
[H+] [HCO3-)
[H+][HCO3-)
[H2CO3]
Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
What is a weak acid?A weak acid is an acid that dissociates partially in the water.
The equation for the acid dissociation of carbonic acid is:
H₂CO₃ ⇄ H⁺ + HCO₃⁻
The weak ionization constant (Ka) is the equilibrium constant for this reaction, that is, the product of the concentration of the products divided by the product of the concentrations of the reactants, all of them raised to their stoichiometric coefficients.
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
Carbonic acid is a weak acid. Its weak ionization constant (Ka) is equal to:
Ka = [H⁺] [HCO₃⁻] / [H₂CO₃]
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What is the mass in grams of 5.2 x 1028 atoms of manganese (Mn)?
The mass, in grams, of 5.2 x 10^28 atoms of manganese would be 0.0006833 grams
Mass calculationAccording to Avogadro, 1 mole of any substance contains 6.022 x [tex]10^{23}[/tex] atoms.
Thus, how many moles would be in 5.2 x [tex]10^{28}[/tex]atoms of Mn:
= 6.022 x [tex]10^{23}[/tex] /1 x 5.2 x [tex]10^{28}[/tex]
= 0.00001158 moles
Mass of 0.00001158 moles Mn = 0.00001158 x 54.9
= 0.0006833 grams
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In the following acid-base reaction,
HPO42- is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
А
B
С
acid
conjugate
acid
conjugate
base
Taking into account the Brønsted-Lowry acid-base theory, HPO₄⁻² is conjugate base of H₂PO₄⁻.
Brønsted-Lowry acid-base theoryThe Brønsted-Lowry acid-base theory (or the Brønsted-Lowry theory) identifies acids and bases based on whether the species accepts or donates protons or H⁺.
According to this theory, acids are proton donors while bases are proton acceptors.
So, reactions between acids and bases are H⁺ proton transfer reactions, causing the acid to form its conjugate base and the base to form its conjugated acid by exchanging a proton.
In other words, a conjugate base is an ion or molecule resulting from the acid that loses the proton, while a conjugate acid is an ion or molecule resulting from the base that gains the proton:
acid + base ⇄ conjugate base + conjugate acid
This caseIn this case, you know:
H₂PO₄⁻ + NH₃ → HPO₄⁻² + NH₄⁺
H₂PO₄⁻ behaves like acid because donates an H⁺ proton while NH₃ behaves like base because accepts an H⁺ proton from the acid.
So, NH₄⁺ is the conjugate acid of the NH₃ and HPO₄⁻² is conjugate base of H₂PO₄⁻.
In summary, HPO₄⁻² is conjugate base of H₂PO₄⁻.
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Calculate the (H3O+) for a solution whose pH is 6.79
Note: blank 1 should have three significant figures
The answer is: Blank 1 X 10^Blank 2
Answer:
Explanation:
alculate the (H3O+) for a solution whose pH is 6.79
Note: blank 1 should have three significant figures
The answer is: Blank 1 X 10^Blank 2
The pH of a solution is the negative logarithm of H₃O⁺ ion concentration.The concentration of H₃O⁺ ions in a solution with a pH of 6.79 is 1.6 × 10⁻⁷M.
What is pH ?pH of a solution is the measure of its acidity or basicity. Mathematically it is the negative logarithm of its H₃O⁺ ion concentration. A solution with a pH of 7 is neutral.
The solution with a pH below 7 is acidic and above 7 is basic. Thus, the higher H+ ion concentration, then the pH will be lower and more acidic the solution.
It is given that the pH of the solution is 6.79. The concentration of H₃O⁺ ions in the solution is calculated is calculated as follows:
pH = -log ( H₃O⁺)
6.79 = -log( H₃O⁺
[ H₃O⁺] = antilog (-6.79)
= 1.6 × 10⁻⁷M
Hence, the hydronium ion H₃O⁺ ion concentration of the solution of pH 6.79 is 1.6 × 10⁻⁷M.
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What is The fmu (grams/mole) for disulfur hexachloride *the formula for it is S2Cl6*
Hexasulfur Dichloride
Name: Hexasulfur Dichloride
Formula: S2Cl6
Molar Mass:276.848
Example Reactions:
• S2Cl6 + 4H2O = 2SO2 + 6HCl + H2
Suggest some ways in which you might determine whether a particular water solution contains an acid or a base.
The use of the pH scale and litmus paper are the ways which can determine whether the solution is an acid or base.
How pH scale and litmus paper tell about acidic and basic solution?The pH scale is the way which determine the acidic or basic nature of a solution. If the pH of a solution is less than 7, it is considered as acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.
While on the other hand, litmus paper also tells us about acidic and basic nature of solution. if the litmus paper turns red, it means the solution is acidic whereas if the litmus paper turns blue it means basic.
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Describe how distillation process makes water soft
Answer:
Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.
Explanation:
Which compound is an alcohol?
CH3Br
CH4
CH3COCH3
CH3CH2OH
Answer:
[tex]ch3ch2oh \: is \: alcohol \\ because \: it \: havve \: an \: oh \: grp \: \\ thank \: you[/tex]
Which property of water makes it effective in protecting firefighters?
Answer:
water has a high specific heat
Explanation:
this should work as an answer
the square below has anarea of 49ft2 what is the perimeter of the square
Answer:
28ft
Explanation:
if it's a square then each side is equal
the square root of 49 is 7
each side is 7 ft
7 ft times 4 sides is 28ft
What information does Gibbs free energy give about a reaction?
A. It tells how quickly the reaction will proceed to equilibrium.
B. It tells if the reaction will proceed spontaneously or not.
C. It tells what the most stable forms of the products are.
D. It tells what the activation energy of the forward reaction is.
Answer: b
Explanation:
Suppose that a 10-mL sample of a solution is to be tested for I− ion by addition of 1 drop (0.2 mL) of 0.13 M Pb(NO3)2.
What is the minimum number of grams of I− that must be present in order for PbI2(s) ( Ksp=8.49×10−9 ) to form?
The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
Given data :
Volume of solution to be tested for I-ion = 10 mL
Volume of Pb(NO₃)₂ = 0.2 mL
molarity of Pb(NO₃)₂ = 0.13 M
Determine the number of I that must be presentFirst step : calculate conc of PB²⁺ ions in the solution
conc of PB²⁺ ions = ( molarity of Pb(NO₃)₂ * volume of Pb(NO₃)₂ ) / ( total volume )
= ( 0.13 * 0.2 ) / ( 10 + 0.2 )
= ( 0.026 ) / ( 10.2 ) = 0.002549 M
Next step : determine the molarity of I
using the dissociation reaction of PbI₂
PbI₂(s) ---> Pb²⁺ (aq) + 2I (aq)
also; Ksp = [ Pb²⁺ ] [ I ]² ---- ( 1 )
From the question the given value of Ksp = 8.49 * 10⁻⁹
Therefore equation ( 1 ) becomes
8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²
[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )
= 0.0018 M
Final step : Determine the minimum number of grams of I
moles of I = molarity of I * total volume
= 0.0018 M * 10.2 mL
= 0.01836 * 10⁻³ mol
Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol
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How many moles of carbon are present in 1.50mole of aspirin , C_{9}*H_{8} * O_{4}
Given the molecular formula of aspirin, C₉H₈O₄, in 1.50 moles of aspirin there are 13.5 moles of carbon.
What is a mole?The mole is the SI base unit for the amount of matter. 1 mole of particles contains a number of Avogadro's particles.
We have 1.50 moles of aspirin, C₉H₈O₄. According to the molecular formula, the molar ratio of C₉H₈O₄ to C is 1:9.
1.50 mol C₉H₈O₄ × (9 mol C/1 mol C₉H₈O₄) = 13.5 mol C
Given the molecular formula of aspirin, C₉H₈O₄, in 1.50 moles of aspirin there are 13.5 moles of carbon.
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How many grams of hydrogen will be produced from 4.0 moles of Magnesium?
Answer:
8 grams
Explanation:
trust