Answer:
Total mass of 5 lead fishing weights= 1250 grams
Explanation:
Given:
Mass of a lead fishing weight =250 grams
To find total mass of 5 such fishing weights
We can apply unitary method to find total mass of 5 fishing weights.
If mass of 1 lead fishing weight = 250 grams
∴ Total mass of 5 lead fishing weights = [tex]250\times 5 =1250\ grams[/tex]
Given the balanced equation for the oxidation of ethanol, C2H5OH, by potassium dichromate:
3 C2H5OH + 2 K2Cr2O7 + 16 HCl → 3 C2H4O2 + 4 CrCl3 + 4 KCl + 11 H2O
calculate the volume of a 0.600M K2Cr2O7 solution needed to generate 0.1665 moles of C2H4O2 from a solution containing excess ethanol and HCl
need help stuck
Answer:
185.0 mL of K₂Cr₂O₇ 0.600 M solution
Explanation:
Having the equation balanced in the statement, it is calculated based on the stoichiometric ratio of it, how many moles do I need from K₂Cr₂O₇ to be able to generate 0.1665 moles of C₂H₄O₂
3 moles C₂H₄O₂ _____ 2 moles K₂Cr₂O₇
0.1665 moles C₂H₄O₂ _____ X = 0.111 moles of K₂Cr₂O₇
Calculation: 0.1665 moles x 2 moles / 3 moles = 0.111 moles of K₂Cr₂O₇
Now the volume of solution of K₂Cr₂O₇ that contains the amount of moles calculated above is calculated, as stated in the molar concentration (0.600M), it is calculated:
0.600 moles of K₂Cr₂O₇ _____ 1000 mL solution
0.111 moles of K₂Cr₂O₇ _____ X = 185.0 mL of solution
Calculation: 0.111 moles x 1000 mL / 0.600 moles = 185.0 mL of solution
Therefore, to generate 0.1665 moles of C₂H₄O₂, 185.0 mL of K₂Cr₂O₇ 0.600 M solution is needed.
A student wants to prepare a solution of cobalt(II) fluoride with a known molarity.
How many grams of CoF2 must be weighed out to prepare 100. mL of a 0.157 M aqueous solution of the salt?
Submit Answer
Retry Entire Group
1 more group attempt remaining
Answer:
[tex]\large \boxed{\text{1.52 g}}[/tex]
Explanation:
1. Calculate the moles of CoF₂ needed
[tex]n = \text{0.100 L} \times \dfrac{\text{0.157 mol}}{\text{1 L}} = \text{0.0157 mol}[/tex]
2. Calculate the mass of CoF₂
[tex]m = \text{0.0157 mol} \times \dfrac{\text{96.93 g}}{\text{1 mol}} = \text{1.52 g}\\\\\text{ The student must measure out $\large \boxed{\textbf{1.52 g}}$ of cobalt(II) fluoride}[/tex]
PLSS HELP ASAP PLSS
molar concentration of Na⁺ ions = 3 M
molar concentration of CO₃⁻ ions = 1.5 M
First the water will solvate the sodium carbonate (Na₂CO₃).
Second the 80 mL of water added will dilute the first solution.
Explanation:
When you dissolve the Na₂CO₃ in water, the following solvation process takes place:
Na₂CO₃ (s) + H₂O (l) → 2 Na⁺ (aq) + CO₃⁻ (aq)
To find the final concentration of Na₂CO₃ solution we use the following formula:
concentration (1) × volume (1) = concentration (2) × volume (2)
concentration (2) = concentration (1) × volume (1) / volume (2)
concentration of Na₂CO₃ solution = 2.5 M × 120 mL / 200 mL
concentration of Na₂CO₃ solution = 1.5 M
molar concentration = number of moles / volume (L)
number of moles = molar concentration × volume (L)
number of moles of Na₂CO₃ = 1.5 M × 0.2 L = 0.3 moles
Knowing the solvation process we devise the following reasoning:
if 1 mole of Na₂CO₃ produces 2 moles of Na⁺ ions and 1 mole of CO₃⁻ ions
then 0.3 moles of Na₂CO₃ produces X moles of Na⁺ ions and Y mole of CO₃⁻ ions
X = (0.3 × 2) / 1 = 0.6 moles of Na⁺ ions
Y = (0.3 × 1) / 1 = 0.3 moles of CO₃⁻ ions
molar concentration = number of moles / volume (L)
molar concentration of Na⁺ ions = 0.6 / 0.2 = 3 M
molar concentration of CO₃⁻ ions = 0.3 / 0.2 = 1.5 M
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A similar chemical analysis is performed on a 200.0g sample of the sugar found in corn
syrup. This sample contains 80.Og of carbon, 13.3 g of hydrogen and 106.7 g of
oxygen. What is the percent composition by mass of carbon in this compound?
Answer:
40%
Explanation:
Calculate the percent of the mass that is carbon:
[tex]\% mass = \frac{80}{200} \times 100 = 40\%[/tex]
The percent composition by mass of carbon in the compound is 40%.
To determine the percent composition by mass of carbon in the compound, one must calculate the ratio of the mass of carbon to the total mass of the sample, and then multiply by 100 to get the percentage.
The mass of carbon in the sample is given as 80.0 g. The total mass of the sample is the sum of the masses of carbon, hydrogen, and oxygen, which is 200.0 g (since the sample itself is 200.0 g).
The formula to calculate the percent composition by mass is:
[tex]\[ \text{Percent composition by mass} = \left( \frac{\text{mass of carbon}}{\text{total mass of the sample}} \right) \times 100 \] Substituting the given values into the formula: \[ \text{Percent composition by mass of carbon} = \left( \frac{80.0 \text{ g}}{200.0 \text{ g}} \right) \times 100 \] \[ \text{Percent composition by mass of carbon} = \left( \frac{2}{5} \right) \times 100 \] \[ \text{Percent composition by mass of carbon} = 0.4 \times 100 \][/tex]
[tex]\[ \text{Percent composition by mass of carbon} = 40\% \][/tex]
Therefore, the percent composition by mass of carbon in the compound is 40%.
Choose the aqueous solution below with the highest freezing point. These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.
These all have the same freezing point.
0.200 m Ba(NO3)2
0.200 m Mg(ClO4)2
0.200 m Na3PO3
0.200 m HOCH2CH2OH
Answer:
HOCH₂CH₂OHExplanation:
The decrease of the freezing point is a colligative property, which means that it depends on the number of particles dissolved (solute particles).
The equation for the decrease of the freezing point is:
ΔTf = m × Kf × iWhere:
ΔTf is the decrease of the freezing pointm is the molality of the solutionKf is the molal freezing constant, which depends on the solventi is the van't Hoff factor.For all the given solutions the molality and Kf are the same. So, the difference is given by the van't Hoff factor.
The ideal van't Hoff factor is assumed to be equal to the number of ions into which a solute dissociates in solutions (for ionic solutes) and equal to 1 for covalent molecules.
Then, you must just need to use the dissociation equation for each solute:
Ba(NO₃)₂ → Ba⁺² + 2NO₃⁻ ⇒ i = 3Mg(ClO₄)₂ → Mg²⁺ + 2 ClO₄⁻ ⇒ i = 3Na₃PO₃ → 3Na⁺ + PO₃³⁻ ⇒ i = 4HOCH₂CH₂OH is a covalent molecule ⇒ i = 1Hence, the solution that will experience the lowest freezing point reduction is HOCH₂CH₂OH because it has the lowest van't Hoff factor, and that will be the solution with the highest freezing point.
Explain the importance of educating others about climate change consequences. Describe how you would
present the information in a way that would cover the most important points, as well as emphasizing that
changes in human behavior can make a difference in the ultimate impacts of climate change.
Answer:
Education people about how climate is changing and how we need to change ourselves along with it is very important.
Climate change:
Extreme temperature changes are occurring due to ozone thinning. Cold areas are getting colder and warm areas are getting warmer. This is due to global warming. The climate is being effected, air is being polluted, which makes it harmful to breathe, oceans and seas are becoming a hub of trash and factory waste which is effecting the marine life.
Human behavior:
Technology has a huge part to play. automobiles has caused severe air and noise pollution. Humans produce so much waste that all directly and indirectly effects the environment. Therefore it is us who need to change in order to change the environment.
The importance of educating others about climate change consequences is to ensure proper understanding and solutions to the challenge.
What is Climate change?This refers to the long-term shifts in temperatures and weather patterns and its education is very important.
This is because, it allows to know things which can cause it and also the solutions to the challenge of tackling it.
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If 518.0 g sample of a metal has a volume of 2.00mL what is the density of the metal
Answer:
Density of metal = 259 g/mL
Explanation:
Data Given:
Mass of metal = 518.0 g
Volume of Sugar = 2.00 mL
Density of = ? g/mL
The formula will be used is
d = m/v ........................................... (1)
where
d is density
m is the mass
v is the volume
So
put the given values in Equation (1)
d = 518.0 g / 2.00 mL
d = 259 g/mL
Density of metal = 259 g/mL
Which process takes place when large rocks crumble due to oxidation?
A) Erosion
B) Deposition
C) physical weathering
D) chemical weathering
Answer:
chemical weathering I think it is a right answers
Given 6 moles of CuCl2, how many moles of AICI, were made?
Upon reacting 6 moles of copper(II) chloride with aluminum, 4 moles of aluminum chloride are produced according to the stoichiometry of the balanced equation.
When 6 moles of copper(II) chloride (CuCl₂) react with aluminum (Al), the balanced chemical equation is:
2Al + 3CuCl₂ → 2AlCl₃ + 3Cu
To find the number of moles of aluminum chloride (AlCl₃) produced, we use stoichiometry. The ratio of AlCl₃ to CuCl₂ in the balanced equation is 2:3.
Therefore, for every 3 moles of CuCl₂, 2 moles of AlCl₃ are formed. Given 6 moles of CuCl₂, we can set up a proportion:
(2 moles AlCl₃ / 3 moles CuCl₂) = (x moles AlCl₃ / 6 moles CuCl₂)
Solving for x gives us:
x = (2 moles AlCl₃ / 3 moles CuCl₂) x 6 moles CuCl₂ = 4 moles AlCl₃
So, 6 moles of CuCl₂ react to produce 4 moles of aluminum chloride.
The complete question is:
Aluminum reacts with copper(II) chloride to make aluminum chloride and copper(a)2Al+3CuCl₂→2AlCl₃+3Cu. Given 6 moles of CuCl₂, how many moles of AICI, were made?
when naming a binary compound which element is named first metal or nonmetal
Answer:
Metal is named first
Explanation:
Binary compounds:
The compounds which are made up of the atoms of only two elements are called binary compounds.
For example:
The following compounds are binary:
HCl
NaCl
HCl is binary because it is composed of only hydrogen and chlorine.
Sodium chloride is also binary compound composed of only two element hydrogen and chlorine.
When naming these compounds the name of metal or cation is written first and anion is written after the cation. The anions are non meals.
The anion name is end with suffix " ide".
such as sodium chloride.
EC - Activities
Bryanna
bl195552
Mastery Assess It_5 School Year > Week 18 > Day 87
Target due: 1/29/20
CALCULATOR
MATERIALS
1. A scientist counts 5.62 x 1024 molecules of NaCl. How many moles of NaCl are in the sample? Show your work in
space below.
8.16 moles
11.33 moles
9.33 moles
10.5 moles
9.33 units of NaCl
I did not say molecules because sodium chloride is not a molecule, it is an ionic compound.
Explanation:
To find the number of moles of NaCl we use the Avogadro's number to devise the following reasoning:
if 1 mole of NaCl contains 6.022 × 10²³ units of NaCl
then X mole of NaCl contains 5.62 × 10²⁴ units of NaCl
X = (1 × 5.62 × 10²⁴) / 6.022 × 10²³
X = 0.933 × 10
X = 9.33 units of NaCl
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Each society can have only one culture operating within it at a time
please select true or false
Answer:
its B
Explanation:
Answer:
False
Explanation:
WILL MARK BRAINLIEST In the diagram, the black line represents the concentration of a reactant and the green line represents the concentration of a product.
Which statement best describes the reaction rate?
The reactants maintain an constant concentration in the first half of the reaction.
At the end of the reaction, both product and reactants are of an equal concentration.
The product maintains an constant concentration in the first half of the reaction.
At the end of the reaction, both product and reactants are of a constant concentration.
Answer:
slope of a line tangent to the product curve at any point in time
Explanation:
I believe the answers to the test are:
C
B
B
A
C
A
C
A
B
A
D
A
D
B
A
C
B
A
D
D
Answer:
At the end of the reaction, both product and reactants are of a constant concentration.
Explanation:
took the test
what is true of elements across a period on the periodic table
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. As you move down the table, every row adds an orbital.
Elements across a period on the periodic table generally show a decrease in atomic radius, and an increase in ionization energy, electron affinity, and electronegativity, with acidity increasing from left to right.
When analyzing the periodic table, elements across a period demonstrate systematic changes in chemical properties. As one moves across a period from left to right, the atomic radius generally decreases due to an increase in the number of protons, pulling electrons closer. Concurrently, ionization energy and electron affinity typically increase. The acidity of elements also increases, with more electronegative atoms forming stronger acids. Understanding these trends allows for the prediction of element behavior and chemical reactivity within a period.
10. What is the specific heat of an unknown substance if a 2.50 g sample releases 12 calories as its
temperature changes from 25°C to 20°C?
Answer:
c = 4016.64 j/g.°C
Explanation:
Given data:
Mass of substance = 2.50 g
Calories release = 12 cal (12 ×4184 = 50208 j)
Initial temperature = 25°C
Final temperature = 20°C
Specific heat of substance = ?
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Solution:
Q = m.c. ΔT
ΔT = T2 - T1
ΔT = 20°C - 25°C
ΔT = -5°C
50208 j = 2.50 g . c. -5°C
50208 j = -12.5 g.°C .c
50208 j /-12.5 g.°C = c
c = 4016.64 j/g.°C
The specific heat of the substance is calculated using the formula [tex]Q = mc \Delta T[/tex], with given values of mass, heat, and temperature change. The result is a specific heat of 0.96 cal/g°C.
The specific heat is defined as the amount of heat per unit mass required to raise the temperature by one degree Celsius. The formula to calculate specific heat (c) when the heat (Q) is lost or gained is:
[tex]Q = mc \Delta T[/tex]
Where Q is heat in calories, m is mass in grams, c is specific heat in cal/g°C, and [tex]\Delta T[/tex] is the temperature change in Celsius.
Using the student's data:
Mass (m) = 2.50 g
Heat (Q) = -12 cal (negative because heat is released)
Temperature change ([tex]\Delta T[/tex]) = 20°C - 25°C = -5°C
Now, solving for c:
-12 cal = (2.50 g) c(-5°C)
c = -12 cal / (2.50 g imes -5°C)
c = 0.96 cal/g°C
Therefore, the specific heat of the substance is 0.96 cal/g°C.
7. How many moles are there in 4.6 gms of Sodium(Na)?
Answer:
0.2mol
Explanation:
mol = mass/mr
mass = 4.6g
mr = 23
mol = 4.6/23
= 0.2mol
The pressure on 3.65L of anesthetic gas changes from 255kPa to 99.7kPa. What is the new volume if the temperature stays constant?
The new volume of the anesthetic gas at a constant temperature is determined as 9.34L.
New volume of the anesthetic gas
The new volume of the anesthetic gas at a constant temperature is calculated as follows;
P1V1 = P2V2
V2 = (P1V1)/P2
V2 = (3.65 x 255)/(99.7)
V2 = 9.34 L
Thus, the new volume of the anesthetic gas at a constant temperature is determined as 9.34L.
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Which of the following is not among the advantages of generating nuclear energy?
A. It does not release carbon dioxide into the atmosphere
B. It does not require a specialized process or involve any risk
C. It does not release chemicals that cause acid rain
D. It does not contribute to air pollution
(science)
B
While nuclear energy does not pollute the environment, it poses the risk of radiation which is harmful to organisms because it causes lethal mutations.
Explanation:
Nuclear fission, for example, releases neutrons and other particles (at very high speeds) that can ionize materials including DNA. This will induce mutations of DNA most of which are usually lethal to organisms. Gamma and X- rays are also produced by fusion reactions and if exposed to organisms also cause mutations on DNA through double stranded breaks. Therefore, the risk of an accident of a nuclear reactor can have immense ramifications on the ecosystems.
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Volume is decreased inside the compressor, causing an increase in pressure and
We want materials for the compressor that can withstand the high temperatures and pressures of refrigerants.
What is a compressor?The most popular of these is air, and compressors are mechanical devices that are used to raise pressure in a range of compressible fluids or gases.
A compressor is a mechanical device that lowers a gas's volume while raising its pressure.
One particular kind of gas compressor is an air compressor. Pumps and compressors have characteristics in that both raise the pressure on a fluid and can move it via a pipe.
The air is forced into the storage tank by the vacuum and out of the chamber. The compressor shuts off once the storage tank reaches its maximum air pressure. The duty cycle refers to this procedure.
Therefore, Volume is decreased inside the compressor, causing an increase in pressure and Temperature.
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In addition to carbon dioxide, which of the following should Callie expect the seeds to give off as a waste product from performing cellular respiration?
Question options:
water
energy
oxygen
glucose
Answer:
The correct answer is water.
Explanation:
During cellular respiration glucose molecules undergo complete oxidation to from energy in form of adenosine mono phosphate or ATP and metabolic waste products in form of Carbon monoxide(CO2) and water(H2O).
According to the given question Callie expect seeds to give off water(H2O) as a waste product from performing cellular respiration.
Which reactant is limiting
The limiting reactant is Cl₂ (chlorine).
Explanation:
We have the following chemical reaction:
2 Al (s) + 3 Cl₂ (g) → 2 AlCl₃ (s)
And we start with 2.7 g of Al and 3.12 g of Cl₂.
First we calculate the number of moles of each reactant.
number of moles = mass / molar weight
number of moles of Al = 2.7 / 27 = 0.1 moles
number of moles of Cl₂ = 3.12 / 71 = 0.044 moles
From the chemical reaction we see that 2 moles of Al are reacting with 3 moles of Cl₂ so 0.1 moles of Al are reacting with 0.15 moles of Cl₂ which is a quantity higher than our available one of 0.044 moles of Cl₂. The limiting reactant is Cl₂.
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what happens when a certain number of hydrogen ions are mixed with the same number of hydroxide ions
Answer:
water is formed
Explanation:
acid and base maxing form salt and water by combining proton and hydroxyl ions
How are meiosis related to sexual reproduction
Answer:
Meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information. These cells are our sex cells – sperm in males, eggs in females.
Meiosis is a cell division process that generates gametes (sperm and egg cells) with half the number of chromosomes. These gametes merge during sexual reproduction, restoring the full chromosome count and creating a genetically unique offspring. Thus, meiosis is essential for sexual reproduction.
Explanation:Meiosis is a type of cellular division that produces four daughter cells, each with half the number of chromosomes as the parent cell. This process is essential for sexual reproduction because it creates the reproductive cells, or gametes (sperm and egg cells), each carrying half of the genetic material. During fertilization, when the sperm and egg merge, the full number of chromosomes (46 in humans) is restored, leading to a genetically unique offspring. Hence, meiosis and sexual reproduction are intimately connected as meiosis provides the variation that drives evolution and adaption in sexually reproducing species.
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A chemistry teacher carried out several demonstrations, and students recorded their observations. For one of the demonstrations, a student concluded that a physical change took place, but not a chemical change. Which of the following observations could the student have made of the results of the demonstration?
Answer:
It demonstrates that it a physical change because you can't see nothing happening but something happening
Sry if it doesn't make sense
The given question is incomplete. The complete question is:
A chemistry teacher carried out several demonstrations, and students recorded their observations. For one of the demonstrations, a student concluded that a physical change took place, but not a chemical change. Which of the following observations could the student have made of the results of the demonstration?
a) Two colorless solutions were combined, and the resulting solution was pink.
b) When a solid was added to a liquid, sparks were produced.
c) One piece of solid substance was changed into small pieces.
d) When two solutions were combined, a precipitate formed.
Answer: One piece of solid substance was changed into small pieces.
Explanation:
Physical change is defined as the change in which shape and size of a substance changes, There is no change in the composition of the substance as no new substance is forming. It is usually an reversible reaction.
Chemical change is defined as the change in which a change is the chemical composition takes place resulting in the formation of new substance. It is usually an irreversible reaction.
Indicators showing chemical changes are :
Color change
Characteristic odor
Formation of bubbles
Formation of precipitate
Thus the given change is a physical change as only the physical state i.e. size of solid substance was changed into small pieces.
If Fifty tabs of Clarithromycin 500mg costs $25.00, how much would ten tabs of Clarithromycin 500mg cost ?
Answer:
5$
Explanation:
Given data:
Number of tablets = 50
Cost = 25.00$
Number of tablets = 10
Cost = ?
Solution:
we will solve this problem through cross multiplication.
25/50 = x/ 10
x = 25/50×10
x = 0.5 × 10
x = 5
To find the cost of ten tabs of Clarithromycin 500mg, set up a proportion based on given information and solve for the cost.
Explanation:To find the cost of ten tabs of Clarithromycin 500mg, we need to set up a proportion based on the given information.
If 50 tabs cost $25.00, then we can set up the proportion:
50 tabs / $25.00 = 10 tabs / x
Cross-multiplying, we get:
50x = 10 × $25.00
50x = $250.00
Dividing both sides by 50, we find that x = $5.00.
Therefore, ten tabs of Clarithromycin 500mg would cost $5.00.
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what is the transfer of electrons in Al + Cl = AlCl3
Answer:
3 e⁻ transfer has occurred.
Explanation
This is a redox reaction.
Oxidation (loss of electrons or increase in the oxidation state of entity)Reduction (gain of electrons or decrease in the oxidation state of the entity)An element undergoes oxidation or reduction in order to achieve a stable configuration. It can be an octet or duplet configuration. An octet configuration is that of outer shell configuration of noble gas.[Ne]= (1s²) (2s² 2p⁶)A combination of both the reactions( Half-reactions) leads to a redox reaction.
Let us look at initial configurations of Al and Cl
[Al]= 1s² 2s² 2p⁶ 3s² 3p¹
[Cl]= 1s² 2s² 2p⁶ 3s² 3p⁵
Hence, Al can lose 3 electrons to achieve octet config.
and, Cl can gain 1e to achieve nearest noble gas config. [Ar]
This reaction can be rewritten, by clearly mentioning the oxidation states of all the entities involved.
Al⁰ + Cl⁰ → (Al⁺³)(Cl⁻)₃
Here, Aluminum is undergoing an oxidation(i.e loss of electrons) from: 0→(+3)
Chlorine undergoes a reduction half reaction (i.e gain of electrons) from: 0→(-1). There are 3 such chlorine atoms, hence 3 e⁻ transfer has occurred.
Aqueous solutions of lead nitrate and potassium iodide are combined in a test tube. The best proof that a chemical reactions has occurred would be that
Answer:
Observe the yellow color (lead iodide)
Create a story and describe the motion (in meters) of an object that has traveled a distance but has no displacement. Need Help ASAP
Answer:
One complete revolution around a circular path.
Explanation:
Let us take the case of a car moving in a circular track of radius r metres.
In one revolution, the car covers the length(distance) equal to the perimeter of the circle.
In this case, distance traveled = 2[tex]\pi[/tex]r metres
But after one complete revolution, the car reaches the same position as it was at the beginning of the motion.
Hence, the initial and final points coincide or the car hasn't changed it's position w.r.t the initial point.
So in this case, the displacement is zero.
Hence, revolution of a car around a circular path is an example of an object traveling a distance but having no displacement.
What makes the results of a scientific experiment accurate?
Group of answer choices
A) Having multiple trials
B) Lacking any supporting data
C) Working in a lab
D) Using a hypothesis that is always true
Answer:
A
Explanation:
That's the best answer out of all of them.
Answer:the answer is a it makes the most sense and i tried looking at all of it and a actually made the most sense but umm yea its a
CH4+ 2O2>CO2 + 2H2O
What will accompany the products as a result of this reaction?
Discuss how your balanced chemical equation agrees with the law of conservation of mass.
Answer:
The given reaction is combustion reaction heat is also produced.
Explanation:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
The given reaction is combustion of methane. When methane burn it produced water and carbon dioxide. Heat is also produced.
The given reaction followed the law of conservation of mass.
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
CH₄ + 2O₂ → CO₂ + 2H₂O
There are equal number of carbon hydrogen and oxygen atoms present on both side of equation. So it follow the law of conservation of mass.