Atomic number = The number of proton in an atom or ion so the right answer is 5!
What mass of a concentrated solution of nitric acid (68.0% HNO3 by mass) is needed to
prepare 400.0 g of a 10.0% solution of HNO3 by mass?
Answer:
58.8 grams.
Explanation:
First we calculate how many HNO₃ grams are there in 400.0 g of a 10.0% solution:
Out of 100 g of a 10.0% solution, 10 g will be of HNO₃.400.0 g * 10.0/100 = 40 g HNO₃Then we calculate the mass of a 68.0% solution that would contain 40 grams of HNO₃:
40 g HNO₃ * 100 g Solution/68 g HNO₃ = 58.8 gHow does increasing the concentration of the reactants help a chemical reaction
rate to increase? (check all that apply) *
1. makes molecules collide with more energy
2. helps with the direction or orientation of the collision
3. increases the number of collisions
No links I’ll report you
What is the mass of a gas with a molar mass of 44.01 g/mol at a temperature of 298 K, a pressure of 0.957 atm and a volume of 1.30L?
Answer:
2.24 g
Explanation:
First we use the PV=nRT formula to calculate the number of moles of the gas:
0.957 atm * 1.30 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298 Kn = 0.0509 molThen we can use the given molar mass to calculate the mass:
Molar Mass = Mass / number of moles44.01 g/mol = Mass / 0.0509 molMass = 2.24 gA gas has a volume of 450. mL at 55.0 °C. If the volume changes to 502 ml, what is the new temperature?
Answer:
92.9 °C
Explanation:
Step 1: Given data
Initial volume (V₁): 450. mLInitial temperature (T₁): 55.0 °CFinal volume (V₂): 502 mLStep 2: Convert 55.0 °C to Kelvin
We will use the following expression.
K = °C + 273.15 = 55.0 + 273.15 = 328.2 K
Step 3: Calculate the final temperature of the gas
If we assume constant pressure and ideal behavior, we can calculate the final temperature of the gas using Charles' law.
T₁/V₁ = T₂/V₂
T₂ = T₁ × V₂/V₁
T₂ = 328.2 K × 502 mL/450. mL = 366 K = 92.9 °C
If there are 1.2 moles of gas at a pressure of 0.55 atm and a temperature of 350K, what is the volume of the container that the gas is in? (Round answer to the nearest 100th place)
Answer:
98.42 L of a gas
Explanation:
So we'll use the formula:
PV=nRT
To find the volume:
v=(nRT)/P
n=1.2 moles
R=0.08206 Latm/K.mol
-A small side note: It is good to check the units of the quantities that you've been provided ,in order to determine which R value to use.
T=350K
P=0.35 atm
V=(1.2 x 0.08206 x 350)/(0.35)
V=98.472L
=98.42 L
Hope it helps:)
prepare an editorial for national newspaper Daily highlighting the importance of sustainable development
SERIOUS flooding IN DELHI
Explanation:
Which best compares kinetic energy and temperaturo?
A. Kinetic energy is energy of motion, while temperature is a measure of that energy in substances.
B. Temperature is energy of motion, whilo kinetic energy is a measure of that energy in substances,
C.Kinetic energy is internal transferable energy, while temperature is a measure of that energy in substances,
D.Temperature is internal transferable energy, while kinetic energy is a measure of that energy in substances.
Which best compares kinetic energy and temperature?
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A. Kinetic energy is energy of motion, while temperature is a measure of that energy in substances. ✅
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Answer:
A. Kinetic energy is energy of motion, while temperature is a measure of that energy in substances.
Explanation:
got it right on edge 2021
One kilogram of water at 100 0C is cooled reversibly to 15 0C. Compute the change in entropy. Specific heat of water is 4190 J/Kg.K.
Answer:
The change in entropy is -1083.112 joules per kilogram-Kelvin.
Explanation:
If the water is cooled reversibly with no phase changes, then there is no entropy generation during the entire process. By the Second Law of Thermodynamics, we represent the change of entropy ([tex]s_{2} - s_{1}[/tex]), in joules per gram-Kelvin, by the following model:
[tex]s_{2} - s_{1} = \int\limits^{T_{2}}_{T_{1}} {\frac{dQ}{T} }[/tex]
[tex]s_{2} - s_{1} = m\cdot c_{w} \cdot \int\limits^{T_{2}}_{T_{1}} {\frac{dT}{T} }[/tex]
[tex]s_{2} - s_{1} = m\cdot c_{w} \cdot \ln \frac{T_{2}}{T_{1}}[/tex] (1)
Where:
[tex]m[/tex] - Mass, in kilograms.
[tex]c_{w}[/tex] - Specific heat of water, in joules per kilogram-Kelvin.
[tex]T_{1}[/tex], [tex]T_{2}[/tex] - Initial and final temperatures of water, in Kelvin.
If we know that [tex]m = 1\,kg[/tex], [tex]c_{w} = 4190\,\frac{J}{kg\cdot K}[/tex], [tex]T_{1} = 373.15\,K[/tex] and [tex]T_{2} = 288.15\,K[/tex], then the change in entropy for the entire process is:
[tex]s_{2} - s_{1} = (1\,kg) \cdot \left(4190\,\frac{J}{kg\cdot K} \right)\cdot \ln \frac{288.15\,K}{373.15\,K}[/tex]
[tex]s_{2} - s_{1} = -1083.112\,\frac{J}{kg\cdot K}[/tex]
The change in entropy is -1083.112 joules per kilogram-Kelvin.
Answer:
The change in entropy = [tex]-1083.534 J/k[/tex]Explanation:
Change in entropy,
[tex]\delta S = mCp * In[\frac{T2}{T1}][/tex]
The initial temperature,
[tex]T1 = 100^oC\\\\T1 = 100+273\\\\T1 = 373k[/tex]
Final value of temperature,
[tex]T2 = 15^oC\\\\T2 = 15+273\\\\T2 = 288k[/tex]
where,
[tex]m = 1kg\\\\Cp = 4190 J/kg.k[/tex]
Substitute into [tex]\delta S[/tex]
[tex]\delta S = mCp * In[\frac{T2}{T1}]\\\\\delta S = 1 * 4190 * In[\frac{288}{373}]\\\\\delta S = 4190 * In[0.7721]\\\\\delta S = 4190 * [-0.2586]\\\\\delta S = -1083.534 J/k[/tex]
The negative sign exists because the change in entropy will be decreasing due to cooling.
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Draw the structures of all possible isomers for the following complexes. Indicate which isomers are enantiomer pairs. (a) Bromochloro(ethylenediamine)platinum(II) (square-planar) (b) Tetra-amminedichloroiron(III) ion (octahedral) (c) Amminechlorobis(ethylenediamine)iron(III) ion (octahedral)
Answer:
structures B and C are: enantiomer pair.
Explanation:
Attached below are the structures of all possible Isomers
structures B and C under solution 3 are enantiomer pair. this is because they posses the same connectivity but exhibit opposite three dimensional shapes .
how the government support communities affected by xenophobia
Answer:
They tax the citizens and then provide them with relief efforts
Explanation:
Common disease protocol
what is displacement reaction
What are the characteristics of acids and bases, and some examples of each?
Answer:
Acids taste sour while bases taste bitter. An acid reacts with metals to produce bubbles of hydrogen gas while a base feels slimy to the touch. Acids turn blue litmus paper red while bases turn red litmus paper blue.
An unbalanced chemical equation:a. does not obey Conservation of Mass law b.does obey Conservation of Mass law c.has equal numbers of atoms of each element in both reactants and productsd.none of the above
Answer:
a. Does not obey Conservation of Mass law
Explanation:
An example of an unbalanced chemical equation is:
H₂SO₄ + NaOH → Na₂SO₄ + H₂OAs you can see, there are two Na atoms on the right side of the equation, while only one on the left side, causing the masses on both sides of the equation to not be equal. In other words, not fulfilling the Conservation of Mass law.
Compare with the correctly balanced equation:
H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂ONow both sides of the equation possess the same number of atoms for each element.
Carla is using a fertilizer that contains nitric acid. How is nitric acid classified?
strong acid
weak acid
strong base
weak base
Answer:
Strong acid.....(A)
Explanation:
hope this helps, the person above me is also correct
Answer:
a
Explanation:
13. Given sulfur has an electron configuration of 1s22s22p63s23p4, what oxidation numbers would you expect for sulfur? (Hint: Think about how to achieve a full outer shell.)
A. –2,–4
B. +4, +6, –2
C. +2, –4,–6
D. +4,–4
Answer:
oxidation numbers for sulphur are -2,0,+2+4,+6
Answer:
it's B
+4, +6, –2
what is a saturated organic compound and unsaturated organic compound?
Answer:
Saturated organic compound has only single bonds between carbon atoms. An important class of saturated compounds are the alkanes. Many saturated compounds have functional groups, e.g., alcohols.
Unsaturated organic compound have double or triple covalent bonds between adjacent carbon atoms. The term "unsaturated" means more hydrogen atoms may be added to the hydrocarbon to make it saturated (i.e. consisting all single bonds).
Which atom is the largest?
Chromium
tungsten
gold
copper
Tungsten is the Largest
Having an atomic No of 74
For the reaction 2Na + Cl2 2NaCl, calculate the percent yield if 200g of chlorine react with excess sodium to produce 240g of sodium chloride?
A.61.2%
B.88.4%
C.83.4%
D.72.8%
The answer is D but I need the explanation
percentage yield =(actual yield/theoretical yield) ×100/1
chlorine is the limiting reagent hence would be the major determinant of the product
71[Cl2]=2×58.5[NaCl]
200[Cl2]=x[NaCl]
x=(200×58.5×2)/(71)
x=329.58g(theoretical yield of NaCl)
percentage yield = (240/329.58) ×100
percentage yield= 72.8℅
The answer is that the percentage yield is 72.8 % .
What is Percentage Yield ?Chemical reactions in the real world do not always go exactly as planned on paper.
In the course of an experiment, many things will contribute to the formation of less product than would be predicted.
Besides spills and other experimental errors, there are often losses due to an incomplete reaction, undesirable side reactions, etc.
Chemists need a measurement that indicates how successful a reaction has been. This measurement is called the percent yield.
Percentage yield =(actual yield/theoretical yield) ×100 %
Chlorine is the limiting reagent hence would be the major determinant of the product
Molecular weight of Cl₂ is 71
Molecular weight of NaCl is 58.5
For 1 mole of Cl₂ 2 moles of NaCl is produced
so it is given that Cl₂ is 200 grams
= 200/71
=2.82 moles.
=5.63 moles of NaCl
=5.63* 58.5 grams
=329.58 g of Nacl
So , 329.58g is theoretical yield of NaCl
percentage yield = (240/329.58) ×100
percentage yield= 72.8℅
Therefore the percentage yield = 72.8%
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A 25.0 L balloon at 20ºC is placed in a hot water bath at 90ºC. After 15 minutes, the volume of the balloon stops expanding. What is the new volume of the balloon?
Answer:
After 15 minutes,the volume of the balloon stops expanding
What volume is occupied by 0.108 mol of helium gas at a pressure of 0.96 atm and a
temperature of 315 K?
Express your answer using two significant figures.
Answer:
[tex]V=2.9L[/tex]
Explanation:
Hello there!
In this case, by considering the given information in this problem, it is possible for us to infer that this problem is solved by using the ideal gas equation:
[tex]PV=nRT[/tex]
Next, since we are given the moles, pressure and temperature, we proceed as follows:
[tex]V=\frac{nRT}{P}[/tex]
Then, we plug in the given data to obtain:
[tex]V=\frac{0.108mol*0.08206\frac{atm*L}{mol*K}*315K}{0.96atm}\\\\V=2.9L[/tex]
Best regards!
what geological forces might be responsible for the range of mountains
Answer:
Mountains are built by tectonic processes that cause portions of the Earth's crust to rise. These processes are fueled by the escape of heat from the interior of the Earth, causing crustal uplift by volcanic activity and by movement along faults that, in turn, is responsible for the formation of mountains.
Explanation:
English of hita. aaaaaaaaasaaaaaaaaa
Answer:
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Explanation:
A.
What happens if more product is added to a system at equalibrium
Answer:
There won't be any equilibrium.
Explanation:
Because when we add a product to a system then the equilibrium will not be the same since the weight will be more on one system which will make it unstable.
Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force. Choose the compound that exhibits hydrogen bonding as its strongest intermolecular force. CCl4 C5H12 CH3NH2 NaF CH2I2
Answer:
CH3NH2
Explanation:
Hydrogen bonding is a bond that occurs between hydrogen and a highly electronegative element. It is a kind of dipole - dipole interaction. Hydrogen bonding only occurs when hydrogen is bonded to a highly electronegative element.
If we look at the options stated, it is only in CH3NH2 that hydrogen is bonded to a very electronegative element (nitrogen). Hence, CH3NH2 exhibits hydrogen bonding as its strongest intermolecular force among other intermolecular forces.
Answer:
CH3NH2
Explanation:
To form hydrogen bondings between the molecules, the compound needs a highly electronegative atom (usually N, O, or F) bonded with a hydrogen atom;
Which type of scientist would observe the spread of a species of red fire ants
Why should the oil be removed from a low pressure system at 130F
Hydrogen gas and nitrogen gas react to form ammonia gas. What volume of ammonia would be produced by this reaction if 5.53 mL of hydrogen were consumed
Answer:
5.53 mL of hydrogen will produce 3.6867 mL of Ammonia
Explanation:
The complete balance equation for the given reaction is
N2 + 3H2 --> 2 NH3
Thus, 3 moles of hydrogen produces 2 moles of NH3
Hence, the volume of ammonia produced = 5.53 * (2/3) = 3.6867 mL
Hence, 5.53 mL of hydrogen will produce 3.6867 mL of Ammonia
A flask contains 85.5 grams C12H2011 (sucrose) in 1.00 L of solution. What is the molarit
Your answer.
3.8 M
25 M
10M
1.2M
Answer:
0.25 M
Explanation:
First we convert 85.5 grams of sucrose into moles, using its molar mass:
Molar Mass of C₁₂H₂₂O₁₁ = (Molar Mass of C)*12 + (Molar Mass of H)*22 + (Molar Mass of O)*11Molar Mass of C₁₂H₂₂O₁₁ = 342.3 g/mol85.5 g ÷ 342.3 g/mol = 0.25 molThen we divide the number of moles by the number of liters to calculate the molarity:
0.25 mol / 1.00 L = 0.25 MIf the reaction described by this chemical equation started with 5.77 grams of PbO2 and resulted in 0.331 grams of O2, what is the percent yield of O2
Answer:
42.9%
Explanation:
Step 1: Write the balanced decomposition reaction
PbO₂ ⇒ Pb + O₂
Step 2: Calculate the theoretical yield of O₂ from 5.77 g of PbO₂
According to the balanced equation, the mass ratio of PbO₂ to O₂ is 239.2:32.00.
5.77 g PbO₂ × 32.00 g O₂/239.2 g PbO₂ = 0.772 g O₂
Step 3: Calculate the percent yield of O₂
The real yield of O₂ is 0.331 g. The percent yield of O₂ is:
%yield = real yield / theoretical yield × 100%
%yield = 0.331 g / 0.772 g × 100% = 42.9%
Calculate the mass percent (m/m) of a solution prepared by dissolving 51.56 g of NaCl in 164.2 g of H2O. Express your answer to four significant figures. View Available Hint(s)
Answer:
"23.896%" is the right answer.
Explanation:
The given values are:
Mass of NaCl,
= 51.56 g
Mass of H₂O,
= 165.6 g
As we know,
⇒ Mass of solution = [tex]Mass \ of \ (NaCl+H_2O)[/tex]
= [tex]51.56+164.2[/tex]
= [tex]215.76 \ g[/tex]
hence,
⇒ [tex]Mass \ percent =\frac{Mass \ of \ NaCl}{Mass \ of \ solution}\times 100[/tex]
[tex]=\frac{51.56}{215.76}\times 100[/tex]
[tex]=23.896 \ percent[/tex]