The number of moles of solute in a solution is the product of the molarity and volume of the solution. The number of moles in 0.045 L of 0.465 M potassium bromide is 0.0209 mol. Hence, option A is correct.
What is molarity ?Molarity of a solution is the ratio of its number of moles of solute to the volume of solution in liters. Molarity is the most common term used to express the concentration of a solution.
Molarity is a colligative property thus depends on the amount of substance and it is temperature dependant.
molarity = no.of moles/ volume in L
Given that volume of the potassium bromide solution = 0.045 L
molarity = 0.465 M
then, number of moles of potassium bromide solute = molarity × volume
no.of moles = 0.465 M × 0.045 L = 0.0209 mol.
Therefore, there are 0.0209 moles of potassium bromide is present in the solution.
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A H2CO3 (aq) ---> CO2 (g) + H2O (l) B H2SO4 (aq) + 2NaOH (aq) ---> Na2SO4 (aq) + 2H2O (l) C 2H2 (g) + O2 (g)----> 2H2O (l) D AgNO3 (aq) + NaOH (aq) ---> AgOH (s) + NaNO3 (aq) Which equation above represents a precipitation reaction?
Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The equation which represents a precipiation reaction is:
[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]
what are 3 types of mutations
1- Base substitutions.
2- Deletions.
3- Insertions.
2Na + 2H2O → 2NaOH+ H2
How many grams of sodium would be needed to produce 1.00kg of sodium hydroxide?
Answer:
575 g
Explanation:
1 kg of sodium hydroxide is 1000/40=25 mol.
So 25 mol of sodium will be needed.
25 mol of sodium is 575 g.
According to the stoichiometry of the given chemical equation, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
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.
46 g sodium gives 80 g sodium hydroxide, thus 1000 g sodium hydroxide requires 46×1000/80=575 g sodium.
Thus, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.
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Sulfur hexafluoride, SF6, is a colorless, odorless, very unreactive gas. Calculate the pressure (in atm) exerted by 2.02 moles of the gas in a steel container of volume 6.21 L at 70 ℃.
Answer:
9.15 atm
Explanation:
Ideal gas equation of state PV=nRT
P in hPa, V in L, n in mol, R is a constant which is 83.1 hpa*L/mol*k, T in kelvin.
Plug in all the number, and we will get:
P*6.21=2.02*83.1*343
P =9271.6(in hpa)=9.15 atm
Why are fossils not found in igneous or metamorphic rocks?
Answer:
Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.
Explanation:
Hope this helps! :)
Answer:
Because...
Explanation:
Igneous rock is cooked in extreme hot temperatures.
Metamorphoc is lava cooled downed.
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
Answer:
1 and 4
Explanation:
1. List 3 physical and chemical phenomena
Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Hope this helped.
Which of the following is NOT an example of circular motion?
(A) car turning a corner
(B) car accelerating onto highway
(C) yo-yo on a string going in a circle
(D) the Moon’s path around Earth
Answer:
B
Explanation:
A body moving with a constant speed and constantly changing direction and changing velocity is said to be in circular motion.
An organism's _______ describes its genetic composition. An organism's _______ describes its appearance or observable characteristics.
a) phenotype; genotype
b)heredity; species
c)species; heredity
d) genotype; phenotype
How many hours are in 188 years
Answer: about 1,705,536 hrs
24 hrs = 1 day
189 hrs = 1 week
756 = 1 month
9072 = 1 yr
1,705,536 = 188 yrs
Explanation:
Trust Milky. Milky smart
What mass of methane (CH4) gas occupies a volume of 0,462 L at 1atm and 273K
Explanation:
Since methane gas is at 1 atm and 273 K, it is at standard temperature and pressure(STP).
One mole of every gas occupies 22.4 dm^3 at STP, and vice versa. So,
22.4 dm^3 at STP of CH4=1 mol=12+4(1)=16 g
0.462 L(0.462 dm^3) at STP of CH4
=(16 g×0.462 dm^3)/22.4 dm^3
=0.33 g
How many atoms are there in 1.005 moles of CO2?
Answer:
[tex]6.05211\times 10^{23}\ \text{atoms}[/tex]
Explanation:
Moles of carbon dioxide = 1.005 moles
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Number of atoms is given by
[tex]\text{Moles}\times N_A=1.005\times 6.022\times 10^{23}[/tex]
[tex]=6.05211\times 10^{23}\ \text{atoms}[/tex]
The number of atoms in the given amount of moles of carbon dioxide is [tex]6.05211\times 10^{23}\ \text{atoms}[/tex].
The charge of the Fe ion in the compound FeO is blank
The charge of the Fe ions in the compound Fe2O3 is
blank
Answer:
For Feo is 2+
For Fe2O3 is 3+
Btw I did it and got it right!
Explanation:
The charge of the Fe ion in the compound [tex]\rm FeO[/tex]is +2 and the charge of the Fe ions in the compound [tex]\rm Fe_2O_3[/tex] is +3, respectively.
Ion can defined as any atom or molecule having positive or negative charge on it.
In [tex]\rm FeO[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the iron ion must have a charge of +2 to balance the charges and make the compound neutral.
In [tex]\rm Fe_2O_3[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the three oxygen atoms in [tex]\rm Fe_2O_3[/tex] contribute to a total charge of -6. To make the compound neutral, the two iron ions must have a total charge of +6. Therefore, each iron ion must have a charge of +3 to balance the charges and make the compound neutral.
Therefore, Fe ion has a charge of +2 in the compound [tex]\rm FeO[/tex] and has a charge of +3 in the compound [tex]\rm Fe_2O_3[/tex].
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help meeeee
I require someone WITH braincells
22 How does Earth's tilt affect climate?
OA. smaller the tilt, the warmer the summer.
OB. The smaller the tilt, the smaller the temperature difference is between summer and winter.
OC. The larger the tilt, the warmer the summer.
OD. The larger the tilt, the smaller the temperature difference is between summer and winter.
Which is an example of a homoozygous genotype? (There can be more than one answer)
Hh
HH
hh
Answer:
HH and hh
Explanation:
they are the same
Suppose you crushed an antacid tablet before dissolving it in a glass of water. The crushed antacid tablet would:
a. take the same amount of time to dissolve as a whole antacid tablet.
b. dissolve more slowly than a whole antacid tablet.
c. take more time to dissolve than a whole antacid tablet.
d. dissolve more quickly than a whole antacid tablet.
Explanation:
dissolve more quickly than a whole antacid tablet.
Order the items below from largest to smallest size.
ITEM BANK
1 atom of oxygen
1 mole of oxygen
1 molecule of oxygen
3.01 X 1023 atoms of oxygen
4 grams of oxygen
1_
2_
3_
4_
5_
Answer:
1- gram of oxygen, 2- 3.01x1023 atoms of oxygen, 3- 1 molecule of oxygen, 4- 1mole of oxygen, 5- 1atom of oxygen.
a b c or d ..........
Answer:
B
Explanation:
Radiation from ultraviolet rays can cause vision problems and sunburn.
What is the formula unit for a compound made from Li and Cl? (5 points)
LiCl because the total negative charge on Cl is one.
LiCl because the total negative charge on Li is two.
Li2Cl because the total positive charge on Cl is one.
Li2Cl because the total positive charge on Li is two.
Answer:
LiCl because the total negative charge on Cl is one.
Explanation:
Lithium has a charge of 1+ and Chlorine has a charge of 1-.
There are two types of chemical compound one is covalent compound and other is ionic compound. LiCl because the total negative charge on Cl is one. The correct option is option A.
What is chemical Compound?
Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Ionic compounds are hard, these have higher melting and boiling point than the covalent compounds. Li act as cation Li⁺ and Cl act as Cl⁻. These two combine to form LiCl. LiCl is an ionic compound.
Therefore, LiCl because the total negative charge on Cl is one. The correct option is option A.
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I really can’t do this don’t understand it
Answer:
7.96g, 33.79%
Explanation:
I'll try my best to explain the entire process behind this question ;)
From the question, you can write the reaction
[tex]2H_2O(l)->2H_2(g)+O_2(g)[/tex]
Now, there are a few reasons it is like this. Oxygen is a diatomic element, meaning it doesn't and can't exist as just O. It exists as O₂. To balance, this, double the amount of water and hydrogen so there is an equal amount of each element on both sides of the reaction (4 H's, 2 O's on the reactant side, and 4 H's, 2 O's on the product side).
From this we can get a mole-to-mole ratio.
Onto the stoichiometry. Our goal in this is to convert from grams of water to grams of hydrogen, and we do so with a mole to mole ratio.
[tex]71.0gH_2O*\frac{1molH_2O}{18.02g} *\frac{2molH_2}{2molH_2O}* \frac{2.02g}{1molH_2}\\\\ =7.96gH_2[/tex]
Basically, what I did was divide by water's molar mass to get moles of water, multiplied by the mole-to-mole ratio (2:2) to get moles of H2, and then multiplied by H2's molar mass to get what should be the amount of H2 produced by the reaction.
For percent yield, you can calculate it is such:
[tex]\frac{Actual}{Theoretical}*100[/tex]
Plug the numbers in:
[tex]\frac{2.69g}{7.96g}*100\\\\ =33.79%[/tex]
So, the percent yield is 33.79%
Need help with this chemistry problem
explain why the constellations in the night sky change with the seasons
Answer:
Explanation:
If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.
why do atoms combine to form compund?
Answer:
See below
Explanation:
The following reasons tell why atom combine to form compounds:
1) They want to follow octet or duplet rule and attain the noble gas configuration.
2) They combine to form compounds because of the electrostatic attraction between them.
3) They form compounds to lower their energy and to become stable.
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH18074 L of He gas is mixed with 2 L of Ne gas. What is the mole fraction of each component?
moles of He=4 L/22.4 L=0.1786 mol
moles of Ne=2 L/22.4 L=0.0893 mol
total moles of the gas mixture
=0.1786+0.0893
=0.2679 mol
mole fraction of He=0.1786 mol/0.2679 mol=0.6667
mole fraction of Ne=0.0893 mol/0.2679 mol=0.3333
If the sun is out all day, why is it not warm during an Arctic summer?
Answer:
The primary reason is that the sun is low on the horizon all day. Thus, solar energy needs to pass through more atmosphere to get to the ground.
Explanation:
Hope this helps. :)
Answer:
Most all of the visible light striking the snow or ice surface is reflected back without any particular preference for a single color. Most natural materials absorb some sunlight, which gives them their color. Clean snow, however, reflects most of the sunlight, creating a white appearance.
[ I commented on the other answer with the same little add-on, then I realised I could add an answer. Even though this is four days ago, meaning the person who asked the question doesn't need another answer, I hope to give someone else who might be looking at this some insight. ]
El ácido sulfúrico H2SO4 es uno de los compuestos que se utiliza para la producción de fertilizantes como el nitrosulfato amónico. Si disponemos de 8 mL de H2SO4 al 37 %P/P (d=1,26 g /mL), los cuales se disolvieron hasta alcanzar un volumen de solución de 400 mL, con una densidad de 1,08 g/mL. (La densidad del soluto es corresponde a 1,83 g/cm³)
Explanation:
12 hours ago
El ácido sulfúrico H2SO4 es uno de los compuestos que se utiliza para la producción de fertilizantes como el nitrosulfato amónico. Si disponemos de 8 mL de H2SO4 al 37 %P/P (d=1,26 g /mL), los cuales se disolvieron hasta alcanzar un volumen de solución de 400 mL, con una densidad de 1,08 g/mL. (La densidad del soluto es corresponde a 1,83 g/cm³)
Put each equation under the correct heading.
a nonliving substance found in earth crust
Answer:
Dirt
mud
rocks
ect.
Explanation:
I need help with this please
Answer:
raising the Concentration of liquid
raise the temperature of the system
bubbles of hydrogen gas
How much heat must absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s)?
Answer:
about 4.8kJ
Explanation:
There is some missing information in the question given.
For use to determine the amount of heat that must be reacted in the system to convert 100g of NaNO₃ into NaHSO₄(s);
Then, we need to consider the following reaction between sodium nitrate (NaNO₃) and sulfuric acid (H₂SO₄):
[tex]\mathbf{NaNO_{3(s)}+ H_2SO_{4(l)}\to NaHSO_{4(s)}+HNO_{3(g)} \ \ \ \ \ \Delta H = 21.2 \ kJ}[/tex]
From the above reaction, 84.99 gm of NaNO₃ reacted with H₂SO₄ which is converted into NaHSO₄ thereby absorbing 21.2 kJ amount of heat.
This implies that; if 84.99 gm of NaNO₃ absorbs 21.2 kJ amount of heat.
1 gm of NaNO₃ will absorb = [tex]\mathsf{\dfrac{21.2}{84.99} \ kJ \ heat}[/tex]
= 0.2494 kJ amount of heat.
∴
100 g of NaNO₃ will absorb [tex]= \mathsf{\dfrac{21.2}{84.99} \times 100 \ kJ \ heat}[/tex]
= 24.94 kJ amount of heat.
Therefore, we can conclude that the amount of heat that must be absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s) is 24.94 kJ.
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