Answer:
0.071 moles of Na₃PO₄ .
Explanation:
Given data:
Number of molecules of Na₃PO₄ = 4.3× 10²² molecules
Number of moles = ?
Solution:
1 mole contain 6.022 × 10²³ molecules
4.3× 10²² molecules × 1 mol / 6.022 × 10²³ molecules
0.71× 10⁻¹ mol
0.071 mol
The number 6.022 × 10²³ is called Avogadro number.
"It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance"
What is the empirical formula of C9H18
Answer:
CH2
Explanation:
there is a common factor for 9;18 which is 9 so u divide both numbers by it 9/9 and 18/9 giving 1:2 so 1 C to every 2 H so CH2
The empirical formula of C9H18 will be CH2.
What is the empirical formula?The empirical formula of a compound shows the ratio of atoms present in a compound. The molecular formula of the compound shows the total number of atoms present in a compound.
Here, C9H18 if we divide the number of total atoms by 9, C9/ 9, and H18/ 9. the ratio will be in the form of 1: 2. therefore, the empirical formula will be CH2.
C9H18 is the molecular formula of the compound, while CH2 is the empirical formula of the compound. The molecular formula of butane is C4H16, then its empirical formula is CH4. The molecular formula of compound is P4H10 then its empirical formula is P2H5.
Therefore, The empirical formula of C9H18 will be CH2.
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Elemental phosphorus reacts with chlorine gas according to the equation
P4(s)+6Cl2(g)→4PCl3(l)
A reaction mixture initially contains 45.57 g P4 and 130.2 g Cl2.
Once the reaction has reached completion, what mass (in g) of the excess reactant is left?
(Express the mass in grams to three significant figures.)
Mass (in g) of the excess reactant (P₄) left = 7.626 g
Further explanationGiven
Reaction
P4(s)+6Cl2(g)→4PCl3(l)
45.57 g P4 and 130.2 g Cl2
Required
mass (in g) of the excess reactant left
Solution
mol P₄ (MW=124 g/mol) :
45.57 : 124 = 0.3675
mol Cl₂(MW=71 g/mol) :
130.2 : 71 = 1.834
mol : coefficient of reactant : P₄ : Cl₂ :
= 0.3675/1 : 1.834/6
= 0.3675 : 0.306
Cl₂ as limiting reactant(smaller ratio)
Reacted mol of P₄ (as an excess reactant):
=1/6 x 1.834
= 0.306
Unreacted mol of P₄ :
= 0.3675 - 0.306
= 0.0615
Mass of P₄(left) :
= 0.0615 x 124
= 7.626 g
50POINTS!
Using the ideal gas law (PV=nRT) solve for the missing. Variable. R= 0.08206atm*L/mol*k
If 22.9L of an ideal gas was collected at STP. How many moles of the gas were present?
A. 1.02 moles
B. 5.99 moles
C. 3.05 moles
D. 2.74 moles
Answer:
A. 1.02 moles .
Explanation:
Hello!
In this case, given the ideal gas equation, as we need to solve for moles, we divide both sides by RT to get:
[tex]n=\frac{PV}{RT}[/tex]
Thus, by plugging in the pressure and temperature at STP (1.00 atm and 273.15 K respectively) we obtain:
[tex]n=\frac{1.00atm*22.9L}{0.08206\frac{atm*L}{mol*K}*273.15K}\\\\n=1.02mol[/tex]
Therefore, the correct answer is A. 1.02 moles
Best regards!
Which characteristic of a star will determine how it ends
3. The endpoint of a titration involving the reaction of MnO4- to Mn2+ can be detected
by the ... *
A) useofa pH probe.
B) use of redor blue litmus.
C)pink colour of the Mn+2.
D)addition of an indicator like methyl orange.
The solution of manganese ion, Mn2+ is colorless. This way, the reaction involves a colour change from pink to transparent.
There is no option with this information.
So, the best answer is (A)
Answer:
C)pink colour of the Mn+2.
Explanation:
First of all, a titration involving the change from MnO4- to Mn2+ is a redox reaction.
This redox reaction does not need an indicator because the MnO4- has a deep violet colour while Mn2+ has a light pink colour.
Hence, the change from MnO4- to Mn2+ is signaled by the appearance of the light pink colour of Mn2+ at end point.
Which best describes why NH4+ can form an ionic bond with Cl–?
Its outermost shell gains one or more electrons from Cl–.
Its positive charge is attracted to the negative charge of Cl–.
It has a negative charge that is spread over the entire ion.
It has a nitrogen atom that is strongly attracted to Cl–.
Answer:
Its positive charge is attracted to the negative charge of Cl–.
Explanation:
The best description of why NH₄⁺ forms an ionic bond with Cl⁻ is that its positive charge is attracted to the negative charge of Cl⁻.
An ionic bond forms as a result of transfer of electrons. As a result the seemingly metal ion is attracted to the negative non-metal ion.
The electrostatic force of attraction between these ions is the ionic or electrovalent bond.
So, the attraction between these opposite charges will form the ionic bond.
Answer:
B: Its positive charge is attracted to the negative charge of Cl–
Explanation:
right on edge2021
Which of these features was most likely formed by a divergent boundary?
A.Himalayan Mountains
B. San Andreas Fault
C.Mt. St. Helens
D.Great Rift Valley
Answer:
I think the answer is Himalayan Mountain
Explanation:
I'm not sure but I think so
Answer:
Today, the term is most often used to refer to the valley of the East African Rift, the divergent plate boundary which extends from the Afar Triple Junction southward across eastern Africa, and is in the process of splitting the African Plate into two new separate plates.
Explanation:
So it is D
A mixture is made by combining 1.29 lb of salt and 5.35 lb of water.
What is the percentage of salt (by mass) in this mixture?
Answer:
19.47%
Explanation:
[tex]\frac{1.29}{1.29+5.35}[/tex]
Please recheck, for this answer may not be correct
What can you do differently for
the last half of the year in science? Whether it is
improving study skills, turning work in on time
Answer:
I would say, what helps me is really paying attention in class and asking questions, also making sure you study for upcoming test's and quizzes and completely assingments on time
Explanation:
What is creating our Earth's Magnetic field?
1) Our Earth's iron liquid outer core rotating around the solid inner core
2) Our Earth having a stationary inner core
3) Our Earth having rocky center
4) All of the above
Answer:
1) Our Earth's iron liquid outer core rotating around the solid inner core
Explanation:
The earth's magnetic field or the geomagnetic field is produced as a result of the earth's iron liquid outer core rotating around the solid inner core.
This produces the earth's magnetic field.
The earth's core is made up of solid and liquid region. Only the densest elements are found within this region. So, the core is made up of metals which are mainly iron and nickel. The outer core is liquid or molten iron and the inner core is solid. The molten iron and nickel in the outer core moves around the inner core and generates the currents which induces a magnetic field round the earth.what type of reaction is AsCl+H2S --> As2S3+HCl
Answer:
Double replacement:
Explanation:
Chemical equation:
2AsCl + 3H₂S → As₂S₃ + 6HCl
The given reaction is double displacement reaction. In this reaction arsenic trichloride and hydrogen sulfide react and produced arsenic sulfide and hydrogen chloride. In double displacement reaction both anion an cation of reactants are exchanged with each other.
Double replacement:
It is the reaction in which two compound exchange their ions and form new compounds.
General equation:
AB + CD → AD +CB
PLZ HELP ME BEING TIMED!!!!!
Zack and Frankie were planning a game of flashlight tag on both Friday and Saturday night.
Answer:
oKaY?!
Explanation:
Based on the molecular formula, determine whether each of the following is an alkane, alkene, or alkyne. (Assume that the hydrocarbons are noncyclical and there is no more than one multiple bond.)
a. C3H6
b. C6H12
c. H8H18
d. C7H12
Answer:
C₃H₆ is an alkene
C₆H₁₂ is an alkene
C₈H₁₈ is an alkane
C₇H₁₂ is an alkyne
Explanation:
To determine which of the compound is alkane, alkene, or alkyne,we shall use the general formula of alkane, alkene, and alkyne. This is illustrated below:
General formula for alkane => CₙH₂ₙ₊₂
General formula for alkene => CₙH₂ₙ
General formula for alkyne => CₙH₂ₙ₋₂
For C₃H₆:
n = 3
Alkane => CₙH₂ₙ₊₂ => C₃H₂₍₃₎₊₂ => C₃H₈
Alkene => CₙH₂ₙ => C₃H₂₍₃₎ => C₃H₆
Alkyne => CₙH₂ₙ₋₂ => C₃H₂₍₃₎₋₂ => C₃H₄
Thus, C₃H₆ is an alkene
For C₆H₁₂:
n = 6
Alkane => CₙH₂ₙ₊₂ => C₆H₂₍₆₎₊₂ =>C₆H₁₄
Alkene => CₙH₂ₙ => C₆H₂₍₆₎ => C₆H₁₂
Alkyne => CₙH₂ₙ₋₂ => C₆H₂₍₆₎₋₂ => C₆H₁₀
Thus, C₆H₁₂ is an alkene
For C₈H₁₈:
n = 8
Alkane => CₙH₂ₙ₊₂ => C₈H₂₍₈₎₊₂ => C₈H₁₈
Alkene => CₙH₂ₙ => C₈H₂₍₈₎ => C₈H₁₆
Alkyne => CₙH₂ₙ₋₂ => C₈H₂₍₈₎₋₂ => C₈H₁₄
Thus, C₈H₁₈ is an alkane.
For C₇H₁₂:
n = 7
Alkane => CₙH₂ₙ₊₂ => C₇H₂₍₇₎₊₂ => C₇H₁₆
Alkene => CₙH₂ₙ => C₇H₂₍₇₎ => C₇H₁₄
Alkyne => CₙH₂ₙ₋₂ => C₇H₂₍₇₎₋₂ => C₇H₁₂
Thus, C₇H₁₂ is an alkyne.
SUMMARY:
C₃H₆ is an alkene
C₆H₁₂ is an alkene
C₈H₁₈ is an alkane
C₇H₁₂ is an alkyne
Simplify (4f+13g)(2w)
Answer:
8fw+26gw
i think this is it
Calculate the temperature change when 2.00 L at 293 K is compressed to 1.00 L.
Answer:
[tex]\Delta T=-146.5K[/tex]
Explanation:
Hello!
In this case, given the Charles' law which allows us to understand the volume-temperature behavior as shown below:
[tex]\frac{T_1}{V_1}=\frac{T_2}{V_2}[/tex]
Thus, given that we need to calculate the final temperature after the compression, we obtain:
[tex]T_2=\frac{V_2T_1}{V_1}=\frac{1.00L*293K}{2.00L}\\\\T_2=146.5K[/tex]
Thus, the temperature change would be:
[tex]\Delta T=T_2-T_1=146.5K-293K\\\\\Delta T=-146.5K[/tex]
Best regards!
The pressure exerted by the atmosphere at sea level is 14.7 Libs per square inch how many pounds of force are pressing on a rectangle with an area of 76.3cm^2
Pounds of force pressing on a rectangle : F = 173.86 lbs
Further explanationGiven
P at sea level = 14.7 lbs/in²
Area of rectangle : A = 76.3 cm²
Required
Pounds of force
Solution
P = F/A
F= P.A
Conversion :
1 cm² = 0.155 in²
76.3 cm² = 11.827 in²
Input the value :
F = 14.7 lbs/in² x 11.827 in²
F = 173.86 lbs
What is the speed of an electromagnetic wave with a frequency of 8 Hz and a wavelength of 5.78 nm? (1 nm = 10-9 m)
Explanation:
Speed = Frequency * Wavelength
= 8Hz * 5.78nm
= (8 * 5.78 * 10^-9)m/s
= (4.624 * 10^-8)m/s or 46.24nm/s.
275L/sec to mL/hour with work
How many ATOMS of OXYGEN are there in the following compound
Which type of species distribution pattern might require collaboration between different countries for effective preservation?
Answer:
migratory distribution
Explanation: The pattern of migratory distribution of species may require collaboration between different countries for effective preservation. This is because species migration can make them enter different territories, which will need to provide an effective level of preservation for species survival
Identify the two ways that rocks are broken down into smaller pieces?
A
abrasion and erosion
B
deposition and erosion
C
physical weathering and deposition
D
physical weathering and chemical weathering
answer pleaseeeeeeeee i only have one minute
Answer:
A or C
Explanation:
Answer: It is D.
Explanation: Edge 2021
A solid substance formed from a solution is a(n)
a. reactant
b. equation
C. compound
d. precipitate
A solid substance formed from a solution is a(n).
Answer:D. Precipitate
#CARRYONLEARNING #STUDYWELLA solid substance formed from a solution is a(n)
Choosing:a. reactant
b. equation
C. compound
d. precipitate
Answer:D. Precipitate
#READINGHELPSWITHLEARNING #CARRYONLEARNING #STUDYWELL100POINTS! ANSWER ALL 3 PARTS (look at the picture)
Answer:
Part 1-B
Part 2-D
Part 3-A
Answer:
1.B
2.D
3.A
Explanation:
.......................
When you apply 1000 joules of energy to 50 grams of water its temperature changes to 30 degrees . What was the initial temperature in celsius?
Answer:
25.2°C
Explanation:
Given parameters:
Energy applied to the water = 1000J
Mass of water = 50g
Final temperature = 30°C
Unknown:
Initial temperature = ?
Solution:
To solve this problem, we use the expression below:
H = m c Ф
H is the energy absorbed
m is the mass
c is the specific heat capacity
Ф is the change in temperature
1000 = 50 x 4.184 x (30 - initial temperature )
1000 = 209.2(30 - initial temperature)
4.78 = 30 - initial temperature
4.78 - 30 = - initial temperature
Initial temperature = 25.2°C
How many electrons must nitrogen gain to become like it’s closest noble gas, Neon?
Answer:
3
Explanation:
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients.
A precipitate forms when aqueous solutions of lead(II) nitrate and magnesium sulfate are combined.
Do not include states such as (s) or (aq). It is not necessary for you to indicate which of the products is the precipitate.
_____ + _____ ----> _____ + _____
2). Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients.
A precipitate forms when aqueous solutions of manganese(II) nitrate and potassium hydroxide are combined.
Do not include states such as (s) or (aq). It is not necessary for you to indicate which of the products is the precipitate.
_____ + _____ -----> _____ + _____
3). Write a balanced equation for the single-replacement oxidation-reduction reaction described, using the smallest possible integer coefficients.
The reaction that takes place when zinc metal combines with aqueous hydrobromic acid.
______ + ______ -----> _____ + _____
4). Write a balanced equation for the single-replacement oxidation-reduction reaction described, using the smallest possible integer coefficients.
The reaction that takes place when copper metal combines with aqueous silver nitrate .
_____ + _____ ---> _____ + _____
Answer:
1)Pb(NO3)(aq) + MgSO4(aq)------> Mg(NO3)2(aq) + PbSO4(s)
2)Mn(NO3)2(aq) + 2KOH(aq) ----->Mn(OH)2(s) + 2KNO3(aq)
3)Zn(s) + 2H^2+(aq)----->Zn^2+(aq) + H2(g)
4) Cu(s) + 2Ag^+(aq) ---->Cu^2+(aq) + 2Ag(s)
Explanation:
A double replacement reaction is one in which ions exchange partners.
We can see that the ions in the reactants exchanged their partners in the products. Solid lead II sulphate was precipitated.
Reaction 2 is a single replacement reaction. Solid manganese hydroxide is formed.
Reactions 3 and 4 are redox processes as shown in the respective equations.
Which chemical used to make explosives is a fertilizer-based explosive, but requires nitric acid as a component to be an explosive compound, and has a wide range of uses, including as a noncorrosive de-icing material for sidewalks?
a. Aluminum nitrate
b. Triacetone triperoxide (TATP)
c. Hexamethylene triperoxide diamine (HMTD)
d. Urea nitrate
Answer:
d. Urea nitrate
Explanation:
Urea nitrate is a fertilizer-based explosive that is produced in one step by reaction of urea with nitric acid. The is an exothermic reaction, therefore, necessary steps and precautions must be taken to ensure safety during the process. The equation of the reaction is given below:
(NH₂)₂CO (aq) + HNO₃ (aq) → (NH₂)₂COHNO₃ (s)
It is as easily-made explosive and can also be used as a catalyst in Diels-Alder reactions of aromatic amines.
In the presence of water, urea nitrate readily decomposes to its original components, urea and nitric acid.
On its own, urea is commonly used as a deicer for sidewalks as it is a noncorrosive de-icing material. However, it is a more costly method of deicing, compared to other methods and it is best used where water runs off into vegetation than into a water-body or a storm drain because of its high-oxygen demand which could result in its reducing the oxygen level of the water body. It It is readily found in nature (in our urine) and is also synthesized artificially. It has a very high nitrogen content, and is most often used as a nitrogen‐based fertilizer.
In the reaction shown below, cobalt ...
Co(s) + Ni (C2H302)2(aq) → Co(C2H302)2(aq) + Ni(s)
A) gains electrons and is reduced
B) loses electrons and is oxidised
C) loses electrons and is reduced
D) gains electrons and is oxidised
B) loses electrons and is oxidised
Its oxidation number is 0 in Co(s) and +2 in Co(C2H302)2(aq), hence it gets oxidised
In the reaction as mentioned below:-
[tex]Co(s) + Ni(C2H302)2aq -- > Co(C2H3O2)2aq + Ni(s)[/tex]
As shown in reaction cobalt losses elections so the reaction is oxidised. Thus, option b is correct.
What is oxidation?Oxidation is a type of reaction in which loss of electrons and gain of protons is takes place during a reaction by molecules, atom or ion. Oxidation takes place when the oxidation state of a molecule, atoms or ion is increased.
The opposite reaction is called as reduction in which gains of electron and loss of protons is takes place . In reduction reaction the oxidation state of molecules, atoms or ion is decreased.
Oxygen has been added to a compound as an older method of oxidation. Although oxygen is typically added to a compound in compliance with the loss of electrons requirements and the oxidation state increase.
Therefore, we can say that in the reaction
[tex]Co(s) + Ni(C2H302)2aq -- > Co(C2H3O2)2aq + Ni(s)[/tex]
As shown in reaction cobalt losses elections so the reaction is oxidised. Thus, option b is correct.
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PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP PLEASE HELP!!!
DUE IN 5 MINUTES
TRUE OR FALSE? CHEMISTRY PLEASE ONLY ANSWER IF YOU’RE 100% SURE!!
Answer:
true mark me brainlist
Explanation: