Answer:
281 K
Explanation:
From the question given above, the following data were obtained:
Initial volume (V₁) = 1180 mL
Initial temperature (T₁) = 417 K
Final volume (V₂) = 0.796 L
Final temperature (T₂) =?
Next, we shall convert 0.796 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.796 L = 0.796 L × 1000 mL / 1 L
0.796 L = 796 mL
Finally, we shall determine the final temperature as follow:
Initial volume (V₁) = 1180 mL
Initial temperature (T₁) = 417 K
Final volume (V₂) = 796 mL
Final temperature (T₂) =?
V₁/T₁ = V₂/T₂
1180 / 417 = 796/T₂
Cross multiply
1180 × T₂ = 417 × 796
1180 × T₂ = 331932
Divide both side by 1180
T₂ = 331932 / 1180
T₂ = 281 K
Therefore, the final temperature of the of the gas is 281 K
What is the concentration of a solution of HBr if 0.40 L is neutralized by 0.20 L of 0.50M solution of LiOH?
Very long question but PLZ help
20. Calculate the hydrogen-ion concentration [H + ] for the aqueous solution in which [OH – ]
is 1 x 10 –11 mol/L. Is this solution acidic, basic, or neutral? Show your work. (3 points) Use
K w to solve for the hydrogen ion concentration here. Then, once you have your numerical
answer (with units!), answer the question about the solution.
Calculate the hydrogen-ion concentration (show all set up work with calculations) – (2 pts)
Discuss your answer and how it is related to the solution being acidic, basic or neutral and then
identify your solution as acidic, basic or neutral based on your calculated hydrogen-ion
concentration. – (1 pts)
Kw = [H+][OH-]
[OH] = 1.0 x 10^-11 M
Kw = 1.0 x 10^-14
[H+] = Kw/[OH-] = 1.0 x 10^-14 / 1.0 x 10^-11 = 1.0 x 10^-3 M
The solution is acidic, because [H+] > [OH-].
1. Sam needs to know the volume of a cardboard box. Which tool
would he use to find the measurements he needs to calculate
volume?
A)ruler
B(balance
C) spring scale
D)thermometer
A 7.50 liter sealed jar at 18 degrees C contains 0.125 moles of oxygen and 0,125 moles of nitrogen gas. What is the pressure in the container?
Which of the four fundamental forces are involved in chemical bonding?
Answer:
The electromagnetic force is an important force in the chemical and biological sciences, as it is responsible for molecular connections like ionic bonding and hydrogen bonding.
write any 2 uses of fractionate distillation
Answer:
Fractional Distillation could be used to:
Obtain the different fractions of a crude which may have more uses and be more useful.Obtain ethanol from a mixture of ethanol and water.Fractional Distillation is used to obtain one substance from a mixture. It depends on the boiling points of the substances.
will these compounds have triple, single, or double bonds ?
C02
Br2
Answer:
double bond
Explanation:
it contains combinations
How much water is needed to prepare a .50 molal solution using 0.50 moles of sodium chloride??
The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
How to calculate volume?The volume of a solution can be calculated using the following formula:
Volume = no of moles ÷ molarity
According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:
Volume = 0.50 moles ÷ 0.5M
Volume = 1L
Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
Learn more about volume at: https://brainly.com/question/12346232
#SPJ1
Find the molar mass of CaCO3
Answer:
molar mass of caco3 is
100.0869 g/ mol
wuuutttttt....help me
ASAPPPPP
how do 2 positive charge move in an electric field
Answer:
yer
Explanation:
Calculate the change in heat (Q) that occurs when 27.58grams of liquid water at 16°C heats to water vapor at 62°C. (cp = 4.184 J/g°C)
Answer:
5308.16J
Explanation:
Using the formula;
Q = m × cp × ∆T
Where;
Q = change in heat (J)
m = mass of substance (g)
cp = specific heat capacity (4.184 J/g°C)
∆T = change in temperature (°C)
According to the information given in this question;
Q = ?
m = 27.58 grams
cp = 4.184 J/g°C
∆T = 62°C - 16°C = 46°C
Using Q = m × cp × ∆T
Q = 27.58 × 4.184 × 46
Q = 5308.157
Q = 5308.16J
What is the molarity of a solution containing 29g of NaCl in 1L solution?
Answer:
hope this helps
Explanation:
1M NaCl solution is 58.5 g/1000 ml , where molecular wt of NaCl being 58.5 grams , so 29.2 g of NaCl in 1000 ml of water will be equal to : 29.2g /58.5g = 0.499145299 M , so 29.2 g NaCl dissolved in 100 ml would correspond to , 0.499145299 M X 1000 ml/100 ml = 4.99145 M or about 4.99 M
Baking soda (sodium bicarbonate) is a compound commonly used in baked goods, as a deodorizer in refrigerators, and as an antacid. Commercial quantities of baking soda are produced by mixing soda ash dissolved in water with carbon dioxide. Baking soda precipitates as a solid from this method:
Na2CO3 + CO2 + H2O → 2NaHCO3
How many grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate?
Answer:631 g
Explanation: bc i did the math
630.581 grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate.
How we calculate moles from grams?Moles can be related to the mass or weight of any substance as follow:
n = W/M, where
W = given mass
M = molar mass
Given balanced chemical equation for the formation of sodium bicarbonate is:
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
From the stoichiometry of the reaction, it is clear that:
1 mole of Na₂CO₃ is required = to form 2 moles of NaHCO₃
Or 1/2 mole of Na₂CO₃ is required = to form 1 moles of NaHCO₃
Moles of NaHCO₃ be calculated by using the above formula as:
n = 1,000g (given) / 84.007g/mole = 11.90 moles
So, moles of Na₂CO₃ required to form 11.90 moles of NaHCO₃ = 11.90×1/2 = 5.95 moles
Now we convert the mole of Na₂CO₃ to grams by using the mole formula:
W = 5.95mole × 105.98g/mole = 630.581 grams.
Hence, 630.581 grams of soda ash would be needed.
To know more about moles, visit the below link:
https://brainly.com/question/15374113
What happens to the sugar that plants make during photosynthesis?
문
F
It is recycled in the soil and through the roots so other consumers
can grow
It is released by the stoma in the leaves and made available to
other consumers
It is used for growth and maintenance of the plant and a small
amount is available to feed consumers.
None of the above
Answer:
glucose
Explanation:
plants use sunlight water and the gases in the air to make glucose which is aform of sugar
9 The Haber process is a reversible reaction. N2(g) + 3H2(g) 2NH3(g) The reaction has a 30% yield of ammonia. Which volume of ammonia gas, NH3, measured at room temperature and pressure, is obtained by reacting 0.75 moles of hydrogen with excess nitrogen?
Answer: 3.36 L of ammonia gas
Explanation:
The balanced chemical reaction is:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to stoichiometry :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will producee=[tex]\frac{2}{3}\times 0.75=0.50moles[/tex] of [tex]NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100}\times 0.50moles=0.15moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]273K[/tex]
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{0.15\times 0.0820 L atm/K mol\times 273K}{1atm}=3.36L[/tex]
Thus 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
3.36 L of ammonia gas.
The balanced chemical reaction is:
[tex]N_2(g) + 3H_2(g)\rightarrow 2NH_3(g)[/tex]
According to the above reaction:- :
3 moles of [tex]H_2[/tex] produce = 2 moles of [tex]NH_3[/tex]
Thus 0.75 moles of [tex]H_2[/tex] will produce[tex]\frac{2}{3} \times0.75=0.50\ mol\ NH_3[/tex]
But as percent yield is 30 %, amount of ammonia produced = [tex]\frac{30}{100} \times0.50\ moles\\\\=0.15\ moles[/tex]
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure = 1 atm
V = Volume = ?
n = number of moles = 0.15
R = gas constant =0.0821 Latm\Kmol
T =temperature =273 K
[tex]V=\frac{nRT}{P} \\\\=\frac{0.15\ times0.0820\ Latm\Kmol\times273\ K}{1\ atm} \\\\=3.36\L[/tex]
Hence, 3.36 L of ammonia gas is obtained by reacting 0.75 moles of hydrogen with excess nitrogen.
To know more about:-
brainly.com/question/23967621
ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
what type of ion do elements from each of the following groups form ,
group1
group 7.
Answer:
group 1 - cations charge +1
group 7 - anions charge -1
Explanation:
Group 1 has one valence electron and will lose one electron to complete the octet.
Group 7 has 7 valence electrons and will accept an electron to complete the octet.
Group 1 elements form cations while group 7 elements form anions as per their electronic configuration.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
https://brainly.com/question/29757010
#SPJ2
What is the net ionic equation for the reaction below?
2H+ + CO32– + 2Na+ + 2OH– 2Na+ + CO32– + 2H2O
Answer:
The given reaction in your problem is the ionic equation for an acid (carbonic acid) reacting with a base (sodium hydroxide). All components of the reaction are then written in ionic form except for reactant weak electrolytes and the driving force product compound of the reaction (H2O). See following explanation.
Explanation:
Metathesis Rxn: molecular equation of rxn
H₂CO₃(aq) + 2NaOH(aq) => Na₂CO₃(aq) + 2H₂O(l)
Ionic Equation: shows all components of the reaction
H₂CO₃(aq) + 2Na⁺(aq) + 2OH⁻(aq) => 2Na⁺(aq) + CO₃²⁻(aq) + 2H₂O(l)
H₂CO₃(aq) wk. electrolyte and H₂O(l) driving force compound are not shown ionized in ionic equation. Only strong electrolytes that ionize 100%; i.e., salts and strong acids and bases.
Net Ionic Equation: shows only the reactive components without the spectator ions (nonreactive components), in this case, the Na⁺(aq) ions.
H₂CO₃(aq) + 2OH⁻(aq) => CO₃²⁻(aq) + 2H₂O(l)
How many atoms in 98.2 g of He?
How is the periodic table organised?
The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.
When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a _____. pls help ASAP!
Answer:
Precipitates Form
Explanation:
I apologize if I am wrong
A sample of gas consists of 4.0 moles, and exists at stp. What is the volume of the gas?
Answer:
The volume of the gas is 89.60
Explanation:
When converting from moles to volume, you would multiply by 22.4 because 1 mole equals 22.4 liters at STP.
So...
4.0 moles * 22.4 liters =
89.60 liters
Answer:
[tex]\boxed {\boxed {\sf 89.6 \ liters}}[/tex]
Explanation:
At STP (standard temperature and pressure), all gases have a volume of 22.4 liters per mole.
[tex]\frac {22.4 \ L }{1 \ mol }[/tex]
Multiply by the given number of moles, 4.0
[tex]4.0 \ mol *\frac {22.4 \ L }{1 \ mol }[/tex]
The moles will cancel out. The 1 in the denominator can be ignored, so this becomes a simple multiplication problem.
[tex]4.0 * {22.4 \ L }=89.6 \ L[/tex]
4.0 moles of a gas at STP have a volume of 89.6 liters.
I NEED HELP PLEASE! (Made it worth A LOT of points!!!)
Selina is a scientist and is designing a portable water warmer that can help her warm up her samples while away from the lab. The device will store two chemicals separately. When she wants to warm up water, she will activate the device, which will mix the chemicals together to generate thermal energy. The thermal energy will increase the temperature of a container filled with water. Selina wants to find the best two chemicals that will generate energy in a safe and portable way. She starts by testing copper sulfate solution and zinc metal. She mixes these chemicals together in a beaker and records her observations in the table.
Time Observations
Before Combination: The copper sulfate solution is blue and zinc metal is a dull grey.
During Combination: Zinc Metal becomes dark and large amounts of thermal energy
is released.
After Combination: The Zinc is gone, a reddish-brownish residue remains, and the
solution is clear.
When copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. How many atoms are there before and after the interaction? Select the correct answer choice.
Before: 5 atoms; after 6 atoms.
Before: 6 atoms; after 6 atoms
Before: 5 atoms; after 5 atoms
Before: 7 atoms; after 7 atoms
Answer:
the third one.
Explanation:
According to law of conservation of mass,before and after the reaction copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged. there are 5 atoms.
What is law of conservation of mass?
According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
Learn more about law of conservation of mass,here:
https://brainly.com/question/28711001
#SPJ2
Explain how increasing the pressure of a gas affects rate of reaction.
Give six examples of complex compounds.
Answer:
Examples of complex compound include potassium ferrocyanide K4[Fe(CN)6] and potassium ferricyanide K3[Fe(CN)6]. Other examples include pentaamine chloro cobalt(III) chloride [Co(NH)5Cl]Cl2 and dichlorobis platinum(IV) nitrate [Pt(en)2Cl2](NO3)2.
A sample of gas has an initial volume of 15 L and an initial pressure of 4.5 atm. If the pressure changes to 1.8 atm, what is the new volume, assuming that the temperature remains constant?
Answer:
37.5 L
Explanation:
Initial Volume, V1 = 15L
Initial Pressure P1 = 4.5 atm
Final Pressure, P2 = 1.8 atm
Final Volume V2 = ?
The relationship between these variables is given as;
P1V1 = P2V2
V2 = PIV1 / P1
Inserting the values;
V2 = 4.5 * 15 / 1.8
V2 = 37.5 L
Answer: The new volume is 37.5L
Explanation:
The question is solved using the principle and formula of a gas law known as the Boyle's law. Boyle's law states that provided the temperature remains constant, the volume of a given mass of gas is inversely proportional to its pressure. Expressing the statement mathematically:
P ∝ 1/V, (where p is equal to pressure and V is volume)
Therefore PV = a constant
If a gas at pressure P1 and Volume V1 changes at constant temperature to pressure P2 and volume V2 then:
P1V1 = P2V2.
Using the formula to solve the question:
P1 = 4.5atm
P2 = 1.8atm
V1= 15L
V2 = ?
V2 = P1V1/P2
V2= 4.5 × 15 /1.8
V2 = 67.5/1.8
V2 = 37.5 L
Therefore the new volume is 37.5L
Which of these results in kinetic energy of an object? position mchotion
Answer:
..... yep
Explanation:
tep no yep no hyshshshss
motion results in the kinetic energy of an object
Four atoms have the numbers of protons and neutrons given below.
Which two atoms are isotopes of the same element?
W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons
X and Y
W and X
X and Z
Answer:
W and X
Explanation:
isotopes : are masses of atoms with the same number of proton and electron but different neutron .
W and X have the same number of protons and different number of neutrons.
Human body cells are made by doing what ?
Answer:
When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.
Explanation: