Answer:
28
Explanation:
The grams of salt dissolved in the solution was 28, because 40 minus 12 would be 28. I know I'm suppose to subtract 40 by 12 considering the fact, it is 12 grams of salt that came out. The rest of the numbers are irrelevant. (apologies this is a week late.)
The amount of salt that was dissolved in the water is 28 grams of the salt.
What is solubility?The term solubility refers to the amount of a substance that dissolves in solution. In this case we are told that about 40-grams of salt was added to water but about 12 grams of the salt came out of the solution.
In this case, the amount of salt that was dissolved in the water is 40 g - 12 g = 28 grams of the salt.
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Which of the following hydrocarbons will be the most acidic?
Pentane
Propylene
Isobutane
Ethene
Acetylene
Answer:
its answer is (Acetylene)
Which of the following is NOT a property of alkanes?
a)
The boiling point increases as the number of carbons in the compound
increases
b) They are unreactive under standard conditions
C) They have weak intermolecular attractions
d) They are soluble in water
Answer:
D
Explanation:
because alkanes don't dissolve in water. They are insoluble.
cetic acid (HC2H3O2) is an important component of vinegar. A 10.00-mL sample of vinegar is titrated with 0.5052 M NaOH, and 16.88 mL are required to neutralize the acetic acid that is present. Write a balanced equation for this neutralization reaction. What is the molarity of the acetic acid in this vinegar
Answer:
The molarity of the acetic acid in this vinegar is 0.853 M
Explanation:
Step 1: Data given
Volume of vinegar sample = 10.00 mL
Concentration of NaOH = 0.5052 M
16.88 mL are required to neutralize the acetic acid
Step 2: The reaction
HC2H3O2(aq) + NaOH(aq) ⇔ NaC2H3O2(aq) + H2O(l)
Step 3: Calculate molarity of cetic acid (HC2H3O2)
C1*V1 = C2*V2
⇒with C1 = the molarity ofHC2H3O2= TO BE DETERMINED
⇒with V1 = the volume of HC2H3O2 = 10.00 mL = 0.01 L
⇒with C2 = the molarity of NaOH = 0.5052 M
⇒with V2 = the volume of NaOH = 16.88 mL = 0.01688L
C1 = (C2*V2)V1
C1 = (0.5052 * 0.01688 ) / 0.01
C1 = 0.853 M
The molarity of the acetic acid in this vinegar is 0.853 M
If the distance between a point charge and a neutral atom and is multiplied by a factor of 5, by what factor does the force on the neutral atom by the point charge change
Given :
The distance between a point charge and a neutral atom and is multiplied by a factor of 5.
To Find :
By what factor does the force on the neutral atom by the point charge change.
Solution :
We know, electrostatic force between two object is directly proportional to product of charge and inversely proportional to distance between them.
Now, charge in neutral atom is 0 C.
So, the electrostatic force between two of them is also 0 N.
Therefore, by changing distance between the charge the forces did no change ( it remains zero).
Possible interaction between oxygen molecule and water is ______________.
Answer:
Hydrogen Bonds
Explanation:
Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.
how to find the group number of f block elements
Answer:
I hope you understand please follow me please
Using dimensional analysis convert 238.0 cm3 to L
Answer:
= 0.238 L
Explanation:
From the given information:
To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)
Recall that:
1000 cm³ = 1 liter
∴
238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]
= 0.238 L
PLEASE HELP ME WITH THESE TWO QUESTIONS I WILL MARK U AS BRAINLIEST!!
Answer:
See Explanation
Explanation:
From the parameters given here in this question;
n= 1.46 moles
P= 0.982 miles
T= 13°C + 273 = 286 K
R= 0.0821 L.atm/mol.K
We are to find the volume using the ideal gas equation which states that;
PV=nRT
V= nRT/P
V= 1.46 × 0.0821 × 286/0.982
V= 34.9 L
b) Boyle's law can be proven from the kinetic theory of gases. Boyle's law states the relationship between the volume and pressure of an ideal gas. Boyle's law states that the pressure of a given mass of ideal gas is inversely proportional to it's volume at constant temperature and pressure. This is the only correct statement among the options listed in the question.
What is the oxidation state of P in Ca3(PO4)2?
A. -5
B. +3
C. +5
D. -3
The oxidation state of P in [tex]Ca_3(PO_4)_2[/tex] is +5. In the compound [tex]Ca_3(PO_4)_2[/tex], there are 3 Ca ions, each with an oxidation state of +2, and 2 [tex]PO_4[/tex] ions. The correct answer is option C.
To find the oxidation state of P, we need to use the fact that the compound has a neutral overall charge and the oxidation states of all the atoms in the compound must add up to zero. Since the oxidation state of Ca is +2, the total positive charge from the Ca ions is +6. Therefore, the total negative charge from the PO4 ions must be -6. Each [tex]PO_4[/tex] ion has a charge of -3, so the total charge from the two [tex]PO_4[/tex] ions is -6. In [tex]PO_4[/tex], the oxidation state of O is -2. Let the oxidation state of P be x. Since there is 4 O atoms per [tex]PO_4[/tex] ion, the total negative charge from the O atoms is -12. Using the fact that the overall charge is zero, we can set up the following equation: 2x + (-12) = -6 Simplifying, we get 2x = +6 - (-12) = +18 Solving for x, we get x = +9/2 = +4.5. However, the oxidation state of P must be a whole number, so we round to the nearest integer and get: +5. Therefore, the oxidation state of P in [tex]Ca_3(PO_4)_2[/tex] is +5 and the correct answer is option C.For more questions on the oxidation state
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3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
(BRAINLIEST AWARD!! LAST QUESTION!!) Jean-Baptiste Lamarck's theory of evolution stated that an organism could pass on to its offspring all characteristics it had acquired in its lifetime. Which of these statements best explains why this theory is considered invalid at present? (1 point)
Modern scientists accept only new scientific theories.
Most of the scientists worldwide do not accept this theory.
All old theories change into new theories over a period of time.
Newspapers and science magazines do not publish this theory any more.
Answer:
Most of the scientists worldwide do not accept this theory.
Explanation:
Lamarck's theory states that acquired traits can be passed on from parents to offspring. This theory can not be sufficiently substantiated by indisputable scientific evidences hence it is not accepted by majority of scientists worldwide.
Since science is empirical and the theory is mostly based on vague speculations rather than concrete evidence, it was long rejected by many biologists.
This theory suggests that all life forms will gradually evolve from simple to complex organisms while the simple organisms gradually disappear. This is not the case.
A pure copper cube has an edge length of 1.76 cm. How many copper atoms does it contain? (volume of a cube = (edge length)^3; density of copper = 8.96 g/cm^3 )
if The difference in height of mercury in the two arms is 435 mm. What is the pressure of the nitrogen gas in kPa?
Answer:
Therefore, Pnitrogen=97.5kpa
Explanation:
100.0-2.49
=97.5
435= i don't know
HELP AS SOON AS POSSIBLE PLEASE……Which of the following equations is balanced? (5 points)
1) 2H2 + O2 + 4H20
2) 4Na + O2 -2Na20
3) Fe2O3 + H2 - 2Fe + 3H20
4) CH4 + O2 - CO2 + H20
Answer:
Number 2 is the balanced equation
Explanation:
There is
4 Na on both sides
2 O on both sides
4Na + O2 -2Na2O is a balanced equation.
What is Balanced equation?An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal.
The chemical equation that depicts the chemical reaction must be balanced as a result. When the total number of atoms in the reactants and products sides of a chemical equation equals one, the equation is said to be balanced.
An unbalanced chemical equation lists the reactants and products in a chemical reaction but doesn't state the amounts required to satisfy the conservation of mass.
Therefore, 4Na + O2 -2Na2O is a balanced equation.
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The movement of the liquid in a thermometer shows changes in temperature. An increase in temperature
indicates the molecules in the liquid
Answer:
When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.
Explanation:
I hope it can help
An increase in temperature indicates the molecules in the liquid are moving faster and the temperature is rising in the thermometer.
What are the uses of mercury Thermometer ?Mercury thermometer are useful in measuring body , liquid and vapor temperature.
Mercury is used in the thermometer , The movement of the liquid in a thermometer shows changes in temperature.
The volume expansion coefficient of Mercury is very high and so by 1 degree rise in temperature there is 0.018 % increase in volume.
An increase in temperature indicates the molecules in the liquid are moving faster and the temperature is rising in the thermometer.
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how many grams of zinc sulfide are used to produce 1.28 grams of zinc oxide?
Answer:
0.012288122055459
Explanation:
i might be wrong
How many grams are in 3.7 moles of Na2O?
Answer:
mass = moles x molar mass
m= 3.7 x (23x2+16)
m= 3.7x62
m= 229.4g
198.4 grams are there is 3.7 moles of Na₂O.
The number of moles is defined as the ratio between given mass and molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\[/tex]
Given:
Number of moles= 3.7 moles
To find:
Mass=?
Molar mass of Na₂O= 62 g/mol
Thus substituting the values in the given formula
[tex]\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}= 3.2 \text{moles}*62 \text{g/mol}\\\\\text{Given mass}=198.4 \text{g}[/tex]
Thus, 198.4 grams are there is 3.7 moles of Na₂O.
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How many molecules in 8H2(g)+4O2
Rank these transition metal ions in order of decreasing number of unpaired electrons.
a. Fe^3
b. Mn^4+
c. V3+
d. Ni^2+
e. Cu^+
Answer: The given transition metal ions in order of decreasing number of unpaired electrons are as follows.
[tex]Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}[/tex]
Explanation:
In atomic orbitals, the distribution of electrons of an atom is called electronic configuration.
The electronic configuration in terms of noble gases for the given elements are as follows.
Atomic number of Fe is 26.[tex]Fe^{3+} - [Ar] 3d^{5}[/tex]
So, there is only 1 unpaired electron present in [tex]Fe^{3+}[/tex].
Atomic number of Mn is 25.[tex]Mn^{4+} - [Ar]3d^{3}[/tex]
So, there are only 3 unpaired electrons present in [tex]Mn^{4+}[/tex].
Atomic number of V is 23.[tex]V^{3+} - [Ar] 3d^{2}[/tex]
So, there are only 2 unpaired electrons present in [tex]V^{3+}[/tex].
Atomic number of Ni is 28.[tex]Ni^{2+} - [Ar] 3d^{8}[/tex]
So, there will be 2 unpaired electrons present in [tex]Ni^{2+}[/tex].
Atomic number of Cu is 29.[tex]Cu^{+} - [Ar] 3d^{10}[/tex]
So, there is no unpaired electron present in [tex]Cu^{+}[/tex].
Therefore, given transition metal ions in order of decreasing number of unpaired electrons are as follows.
[tex]Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}[/tex]
Thus, we can conclude that given transition metal ions in order of decreasing number of unpaired electrons are as follows.
[tex]Mn^{4+} > V^{3+} = Ni^{2+} > Fe^{3+} > Cu^{+}[/tex]
How many grams of oxygen are present in 93.98 g of CO2?
Answer:
There are about 68.33 grams of oxygen present in 93.98 g of CO2.
2Al + 6HCl → 2AlCl3 + 3H2
If 85.0 grams of HCl react, how many moles of H2 are produced?
Answer:
1.17 mol
Explanation:
Step 1: Write the balanced equation
2 Al + 6 HCl → 2 AlCl₃ + 3 H₂
Step 2: Calculate the moles corresponding to 85.0 g of HCl
The molar mass of HCl is 36.46 g/mol.
85.0 g × 1 mol/36.46 g = 2.33 mol
Step 3: Calculate the number of moles of H₂ produced from 2.33 moles of HCl
The molar ratio of HCl to H₂ is 6:3.
2.33 mol HCl × 3 mol H₂/6 mol H₂ = 1.17 mol H₂
A bear has just had a sandwich that contained the equivalent of 2.70 mol of glucose ΔHo 2810 kJ mol 1 The standard molar entropy ΔSo of reaction is 182 J K 1 mol 1 How much energy in kJ is available for sustaining the bear's muscular and nervous activity assuming a body temperature of 36.1oC Make sure that your answer has the correct number of significant figures
Answer:
no
Explanation:
The Fischer esterification mechanism is examined in this question. The overall reaction is: Benzoic acid, C H 3 O H and H C l react to form a methyl ester, H 2 O and H C l. Benzoic acid is a carboxylic acid bonded to a benzene ring. Identify the results or mechanism of each step.
Answer:
See explanation and image attached
Explanation:
Fischer esterification is a type of reaction used to convert carboxylic acids to ester in the presence of excess alcohol and a strong acid which acts as a catalyst. Another final product formed in the reaction is water.
The mechanism for the fischer esterification of Benzoic acid and C H 3 O H in the presence of HCl as the catalyst is shown in the image attached to this answer.
The final products of the reaction are methyl benzoate, water and H^+ as shown in the image attached.
The methyl ester, water, and the acid catalyst (HCl) are byproducts of the Fischer esterification process, which involves protonation, nucleophilic attack, elimination, and deprotonation processes.
Carbonyl oxygen protonation: The carbonyl oxygen of the carboxylic acid (benzoic acid) is protonated by the acid catalyst (HCl) in the first step. The protonation of the carbonyl carbon increases its electrophilicity and promotes the alcohol's nucleophilic assault. Attack by the alcohol's nucleophilic oxygen (methanol, CH3OH) on the protonated carboxylic acid's carbonyl carbon results in the formation of a tetrahedral intermediate. The acid catalyst also helps with this phase. Elimination of water: In the following step, the water molecule must be removed from the tetrahedral intermediate. The hydroxyl group (-OH) from the carboxylic acid and a hydrogen from the hydroxyl group of the alcohol are removed to create this water molecule. Deprotonation: A deprotonation occurs after the removal of water.
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Which of the following is a property of water? (5 points)
It can freeze very fast.
It has low heat capacity.
It exists in only the liquid
state.
It attracts other water molecules.
HELPPPPPPPPPP
Answer: It attracts other water molecules is a property of water.
Explanation:
A property of a substance where its molecules stick to each other is called cohesion.
For example, water molecules attracts each other because water has the property of cohesion.
Whereas water has high heat capacity.
Water can exist in solid, liquid or vapor form.
Thus, we can conclude that it attracts other water molecules is a property of water.
Answer
above answer is correct
Explanation:
A solution of carbonic acid is at equilibrium. How would the system change is more carbonic acid was added to the solution
Answer:
The equilibrium position shifts to the right, in accordance to the constraint principle
At a certain temperature, 0.700 mol SO3 is placed in a 3.50 L container. 2SO3(g)↽−−⇀2SO2(g)+O2(g) At equilibrium, 0.180 mol O2 is present. Calculate c.
Answer: The value of [tex]K_c[/tex] for the given chemical equation is 0.0457.
Explanation:
Given values:
Initial moles of [tex]SO_3[/tex] = 0.700 moles
Volume of conatiner = 3.50 L
The given chemical equation follows:
[tex]2SO_3(g)\rightleftharpoons 2SO_2(g)+O_2(g)[/tex]
I: 0.700
C: -2x +2x x
E: 0.700-2x 2x x
Equilibrium moles of [tex]O_2[/tex] = x = 0.180 moles
Equilibrium moles of [tex]SO_2[/tex] = 2x = [tex](2\times 0.180)=0.360moles[/tex]
Equilibrium moles of [tex]SO_3[/tex] = 0.700 - 2x = [tex]0.700-(2\times 0.180)=0.340moles[/tex]
Molarity is calculated by using the equation:
[tex]Molarity=\frac{Moles}{Volume}[/tex]
So,
[tex][SO_3]_{eq}=\frac{0.340}{3.50}=0.0971M[/tex]
[tex][SO_2]_{eq}=\frac{0.360}{3.50}=0.103M[/tex]
[tex][O_2]_{eq}=\frac{0.180}{3.50}=0.0514M[/tex]
The expression of [tex]K_c[/tex] for above equation follows:
[tex]K_c=\frac{[SO_2]^2[O_2]}{[SO_3]^2}[/tex]
Plugging values in above expression:
[tex]K_c=\frac{(0.0971)^2\times 0.0514}{(0.103)^2}\\\\K_c=0.0457[/tex]
Hence, the value of [tex]K_c[/tex] for the given chemical equation is 0.0457.
In what kind of orbitals do the lone-pair electrons on the singly bonded oxygen of methyl acetate reside, and are they in the same plane as the group
Answer:
Both lone pairs reside in sp3 orbitals; they are co-planar with the CH3 group.
Explanation:
In the compound, methyl acetate, the lone-pair of electrons on the singly bonded oxygen atom is accommodated in sp3 hybridized orbitals.
If we look at the compound, we will notice the both lone pair of electrons on oxygen are accommodated in sp3 orbitals which are co-planar with the CH3 group in the molecule.
A metal forms the fluoride MF3. Electrolysis of the molten fluoride by a current of 3.86 A for 16.2 minutes deposits 1.25 g of the metal. Calculate the molar mass of the metal.
Answer: The molar mass of the metal is 96.45 g/mol
Explanation:
The fluoride of the metal formed is [tex]MF_3[/tex]
The oxidation half-reaction follows:
[tex]M\rightarrow M^{3+}+3e^-[/tex]
Calculating the theoretical mass deposited by using Faraday's law, which is:
[tex]m=\frac{M\times I\times t(s)}{n\times F}[/tex] ......(1)
where,
m = actual mass deposited = 1.25 g
M = molar mass of metal = ?
I = average current = 3.86 A
t = time period in seconds = 16.2 min = 972 s (Conversion factor: 1 min = 60 sec)
n = number of electrons exchanged = [tex]3mol^{-1}[/tex]
F = Faraday's constant = 96500 C
Putting values in equation 1, we get:
[tex]1.25g=\frac{M\times 3.86A\times 972s}{3mol^{-1}\times 96500 C}\\\\M=\frac{1.25g\times 3mol^{-1}\times 96500 C}{3.86A\times 972s}\\\\M=96.45g/mol[/tex]
Hence, the molar mass of the metal is 96.45 g/mol
The molar mass of metal present in MF₃ is calculated by using faraday's law and is equal to 96.45 g/mole.
How we calculate the molar mass?Molar mass of the metal will be calculated by using the Faraday's law as:
m = (M × I × t(s)) / n × F.
Chemical reaction for the given metal will be represented as:
M → M³⁺ + 3e⁻
And according to the Faraday's law given entities are:
m = given deposited mass = 1.25 g
I = average current = 3.86 A
t = time period in seconds = 16.2 min = 972 s
n = number of electrons exchanged = 3
F = Faraday's constant = 96500 C
M = molar mass of metal = to find?
Putting all these values in the above equation and calculate for M as:
M = (1.25)(3)(96500) / (3.86)(972) = 96.45 g/mole
Hence, the molar mass of metal is 96.45 g/mole.
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Use the following balanced equation to answer the questions below.
Answer:
A. 4.5 mol Mg(OH)₂
B. 6 mol NaOH
Explanation:
Let's consider the following balanced equation.
Mg(NO₃)₂ + 2 NaOH ⇒ Mg(OH)₂ + 2 NaNO₃
PART A
The molar ratio of NaOH to Mg(OH)₂ is 2:1. The moles of Mg(OH)₂ produced from 9 moles of NaOH are:
9 mol NaOH × 1 mol Mg(OH)₂/2 mol NaOH = 4.5 mol Mg(OH)₂
PART B
The molar ratio of NaOH to NaNO₃ is 2:2. The moles of NaOH needed to produce 6 moles of NaNO₃ are:
6 mol NaNO₃ × 2 mol NaOH/2 mol NaNO₃ = 6 mol NaOH
Given the following: 30 grams of H3PO4, find the number of moles
Answer:
Number of mole of H₃PO₄ = 0.306 mole
Explanation:
From the question given above, the following data were obtained:
Mass of H₃PO₄ = 30 g
Number of mole of H₃PO₄ =?
Next, we shall determine the molar mass of H₃PO₄. This can be obtained as follow:
Molar mass of H₃PO₄ = (3×1) + 31 + (4×16)
= 3 + 31 + 64
= 98 g/mol
Finally, we shall determine the number of mole in 30 g of H₃PO₄ as follow:
Mass of H₃PO₄ = 30 g
Molar mass of H₃PO₄ = 98
Number of mole of H₃PO₄ =?
Mole = mass / molar mass
Number of mole of H₃PO₄ = 30 / 98
Number of mole of H₃PO₄ = 0.306 mole
