The hydronium ion concentration of an acid rain sample that has a pH of 3.45 is 3.55 × 10-4 M.
Given the pH of hydronium ion = 3.45
The hydronium ion concentration can be calculated from the pH using the exact opposite mathematical procedure. The conjugate acid of H2O is H3O+. In aqueous solutions, a proton is denoted by the symbol H3O+. The proton would create a different structure in a non-aqueous solution. H2O(l) → H+(aq) + OH-(aq).
Because hydrogen ions bond to water molecules to generate hydronium ions, the equations pH = -log[H3O+] and pH = p[H3O+] can be used to compute a solution's pH.
pH + pOH = 14 then [H+] = 10^-pH
So the concentration of hydronium ion = 10^-3.45 = 3.55 × 10-4 M
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If charcoal and sugar were the the main impurities present in crude acetanilide would recrystallisation from water be a good method of purification explain why?
Yes, recrystallization from water would be a viable technique of purification if crude acetanilide contained sugar and charcoal. Due to their physical insolubility, charcoal found in crude acetanilide and water will form a heterogeneous combination. Charcoal will separate during crystallization because it is insoluble in water. Sugar and the unreconstituted crude acetanilide make up the remaining portion of the combination. Crude acetanilide will crystallize in this combination and separate from the sugar and water solution. Filtration will be used to capture the crude acetanilide that has solidified. Sugar and water make a soluble solution, thus they are kept separate. This is how the charcoal and sugar combination is purified and its constituent parts are separated from crude acetanilide using the recrystallization process from water.
What do you understand by the corpuscular nature of chemistry
Answer:
The corpuscular model of matter is a model of the microscopic structure of matter, which seeks to explain the properties and behavior in each state of aggregation
Explanation:
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A student reacted dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate. The diagram shows the stages in the method used.
The highlighted apparatus are;
1) stirring rod
2) crucible
What is a chemical reaction?The term chemical reaction refers to the process by which two or more substances are combined to form a product. The product may look like or different from the reactants that were combined to produce it.
Now we can see the set up that was used as shown for the reaction of dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate.
The highlighted apparatus are;
1) stirring rod
2) crucible
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A 0.266-g sample of NaC1 (molar mass = 58.44 g/mol) is dissolved in enough water to make 5.20 mL of
solution. Calculate the molarity of the resulting solution.
O 0.875 M
O 4.55 x 10-3 M
O 0.987 M
O 1.14 M
O 0.731 M
34.1 mg NaCl in 117.3 mL of solution
The molarity of the solution will be 4.97 M.
What is molarity?It is the number of moles of solutes per 1 liter of solvent or solution.
Mole of 34.1 g NaCl = 34.1/58.44 = 0.5835 mol
117.3 mL = 117.3/1000 = 0.1173 L
Molarity of the solution = 0.5835/0.1173 = 4.97 M
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I need help with the solution
Answer:
36.1% Ca
Explanation:
To find the percent calcium, you need to (1) construct the chemical formula of calcium chloride, then (2) calculate the molar mass of calcium chloride, and then (3) calculate the percent calcium in calcium chloride.
(Step 1)
Calcium = Ca²⁺
Chlorine = Cl⁻
Calcium Chloride = CaCl₂
(Step 2)
Atomic Mass (Ca): 40.078 g/mol
Atomic Mass (Cl): 35.453 g/mol
Molar Mass (CaCl₂): 40.078 g/mol + 2(35.453 g/mol)
Molar Mass (CaCl₂): 110.984 g/mol
(Step 3)
CaCl₂ = 1 atom Ca and 2 atoms Cl
1 atom Ca = 40.078 g/mol
40.078 g Ca
-------------------------- x 100% = 36.1% Ca
110.984 g CaCl₂
Select the correct structure that
corresponds to the name.
1,1,1-trifluoroethane
The correct chemical structure that corresponds to 1,1,1-trifluoroethane is (a).
What is 1,1,1-trifluoroethane?
A chemical structure is a spatial arrangement of atoms in a molecule. It determines the molecular geometry and when necessary the electronic chemistry as well .1,1,1-Trifluoroethane or simply known as trifluoroethane is Hydrofluorocarbon (HFC) compound that is colourless and highly inflammable gas with ether like odour. One method of preparation of 1,1,1-Trifluoroethane is by fluorination of 1-chloro-1,1-difluoroethane in the presence of hydrofluoric acid. The chemical formula for 1,1,1-Trifluoroethane is [tex]C__{2} } H_{3} F_{3}[/tex]. The high stability of it's chemical structure because of being heavier than air makes it a greenhouse gas with high infrared absorbent power. It can be used as a propellant or refrigerant and in cleaning of electrical equipments.
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How many moles of PC15 can be produced from 58.0 g of Cl₂ (and excess
P4)?
0.3268 moles of PC15 can be produced from 58.0 g of Cl₂ (and excess
P4).
How to calculate moles?The mole, symbol mol, exists as the SI base unit of the amount of substance. The quantity amount of substance exists as a measurement of how many elementary entities of a provided substance stand in an object or sample.
The balanced chemical equation is
[tex]P_{4} + 10Cl_{2} = 4PCl_{5}[/tex]
The mass of clorine is m([tex]Cl_{2}[/tex]) = 58.0 g
The amount of clorine is n([tex]Cl_{2}[/tex]) = m([tex]Cl_{2}[/tex])/M([tex]Cl_{2}[/tex]) = 58/70.906 = 0.817 mol
The stoichiometric reaction,shows that
10 moles of [tex]Cl_{2}[/tex] yield 4 moles of [tex]PCl_{5}[/tex];
0.817 of [tex]Cl_{2}[/tex] yield x moles of [tex]PCl_{5}[/tex]
n([tex]PCl_{5}[/tex]) = 4*0.817/10 = 0.3268 mole
0.3268 moles of PC15 can be produced from 58.0 g of Cl₂ (and excess
P4).
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What mass of ammonium sulfate, (NH4)2SO4 must be added to prepare
200.0 g of a 3.5% solution of ammonium sulfate in water?
Considering the definition of percentage by mass, the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.
Percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.
The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
[tex]percent by mass=\frac{mass of solute}{mass of solution}x100[/tex]
Mass of ammonium sulfateIn this case, you know:
mass of ammonium sulfate= ?mass of solution= 200 gpercent by mass= 3.5 %Replacing in the definition of percent by mass:
[tex]3.5 =\frac{mass of ammonium sulfate}{200 g}x100[/tex]
Solving:
3.5÷100= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]
0.035= [tex]\frac{mass of ammonium sulfate}{200 g}[/tex]
0.035×200 g= mass of ammonium sulfate
7 g= mass of ammonium sulfate
Finally, the mass of ammonium sulfate that must be added to prepare 200.0 g of a 3.5% solution of ammonium sulfate in water is 7 g.
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If there are 21.5 grams of citric acid in 0.500 liters of lemon juice, what is the molarity of citric acid (H3C6H5O7) in lemon juice? (rounded to 3 sig figs) (Don’t forget to convert the grams of citric acid into moles.)
The molarity of citric acid in lemon juice is 0.222 mol/L.
What is Molarity ?Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar concentration. The S.I unit of Molarity is molar (M) or mol/L.
How to find the Molarity ?Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]
Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{21.5\ g}{192\ \text{g/mol}}[/tex]
= 0.111 mol
Now put the values in above formula we get
Molarity = [tex]\frac{\text{Number of moles}}{\text{Liters of solution}}[/tex]
= [tex]\frac{0.111\ mol}{0.5\ L}[/tex]
= 0.222 mol/L
Thus from the above conclusion we can say that The molarity of citric acid in lemon juice is 0.222 mol/L.
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The volume of a sample of oxygen is 580.3 mL when
the pressure is 0.376 atm and the temperature is 43 °C.
At what temperature is the volume 907.1 L and the
pressure 0.415 atm?
a. 545
O b. 74.2
O c. -89.9
O d. 272
Answer:
545
Explanation:
If we let the unknown temperature in Kelvin be x,
[tex] \frac{0.376 \times 580.3}{43+273} = \frac{0.415 \times 907.1}{x} \\ \\ x = 545[/tex]
Allowing water to cascade or bubble in a fountain during the purification process is an example of
a chemical reaction
O a solid dissolving in a liquid
O only a and b
O ion exchange
O a gas dissolving in a liquid
Answer:
ion exchange
Explanation:
because in the time period of chemical reactions it product ion
Which statements are NOT involved in boiling water? (check all the possible answers)
a.weakening intermolecular interactions
b.breaking covalent bonds
c.producing single atoms of H and O
d.breaking hydrogen bonds
Minute maid states that a bottle of juice contains 473 ml. Consumer groups are interested in determining if the bottles contain less than the amount stated on the label. To test their claim, they sample 30 bottles. The sample mean was 472ml and the standard deviation is 0. 2. What does mu represent here?.
The term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B
What is the standard deviation?The term standard deviation has to do with the extent that values are scattered around the mean. Now we know that the mean is the average of the distribution.
The standard deviation shows the extent to which the values differ from the mean value of the distribution. It is a measure of dispersion.
Thus, the term mu here represents the average contents of all bottles of juice in the population, which is unknown. Option B
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Missing parts;
Minute Maid states that a bottle of juice contains 473 mL. Consumer groups are interested in determining if the bottles contain less than the amount stated on the label. To test their claim, they sample 30 bottles. The sample mean was 472mL and the standard deviation is 0.2.
What does mu represent here?
A. The average contents of all bottles of juice in the sample, which is unknown.
B. The average contents of all bottles of juice in the population, which is unknown.
C. The average contents of all bottles of juice in the population, which is 472mL.
D. The average contents of all bottles of juice in the sample, which is 472mL.
What volume of barium chloride, BaCl2 is needed to make a 2.5 M barium
chloride solution with 0.45 mol BaCl2?
Answer:
0.18 L
Explanation:
You can find the volume using the molarity ratio:
Molarity = moles / volume (L)
You can plug the given values into the equation and simplify to find the volume.
Molarity = moles / volume <----- Molarity ratio
2.5 M = 0.45 moles / volume <----- Insert values
(2.5 M) x volume = 0.45 moles <----- Multiply both sides by volume
volume = 0.18 L <----- Divide both sides by 2.5
What classifies a substance as an element?
What classifies a substance as a compound?
An element is a substance that cannot be broken down by chemical means. Elements are extremely particular compounds that serve as the foundation for all life and matter (well other than the stuff smaller than atoms). It can contain one atom or trillions of them for anything to be an element, however atoms of different types cannot be combined in. That is to say, every atom has a set number of protons, ranging from 1 to 118. You can be positive that the substance you have is hydrogen if there is just one proton present. Mercury is what you get if you have 80 protons. Atoms of pure hydrogen only contain one proton. As most people are aware, if you add oxygen to it, it turns into water, which is no longer an element but a compound. Nevertheless, the building blocks are the elements. Every single object you can see is composed of elements, whether there are many of them, as there are in the human body, or only a few, as there are in salt.
A compound is a substance with a definite composition (with some leeway there, there are 'non-stoichiometric' compounds), that is composed of 2 or more elements.
Further explanation:
A compound in chemistry is a material that is created by mixing two or more distinct chemical elements in such a way that the atoms of the various elements are kept together by strong chemical bonds. These bonds form as a result of the sharing or exchange of electron s among the atoms. A molecule is the smallest, unbreakable unit of a substance.
A mixture is not a compound since there is no bonding between the atoms of the constituent substances in a mixture. In certain cases, mixing dissimilar elements causes chemical reactions that result in the formation of bonds between the atoms and the molecules of a compound. Other possibilities allow mixing distinct components without causing a reaction, preserving the separate identities of the elements. When elements are combined, reactions can happen quickly or slowly (for example, when iron is exposed to oxygen) (as when lithium is exposed to oxygen). There are times when an element is introduced to a chemical, a reaction takes place, creating new compounds (as when pure elemental sodium is immersed in liquid water).
A compound frequently looks and acts quite different from any of the constituent parts. Think about hydrogen (H) and oxygen, for instance (O). At standard atmospheric pressure and room temperature, both of these substances are gases. However, they combine to form the well-known material known as water, which is a liquid at room temperature and at normal atmospheric pressure and whose molecules each contain two hydrogen atoms and one oxygen atom (H2O).
Few elements' atoms readily combine with those of other elements to produce compounds. These gases—helium, neon, argon, krypton, xenon, and radon—are referred to as noble or inert gases. Compounds made of certain elements can be formed easily with other elements. Examples include fluorine, chlorine, and oxygen.
2) The adjective compound refers to something that is made up of several different components. Examples of this usage include compound eyes, which are found in a variety of insects, compound microscopes, which are high-power magnifying devices made up of multiple lenses, compound sentences, which are organized collections of smaller sentences that form a single integrated perceptual environment, and compound documents.
What is the main problem with a Planetary system model of the atom?
Electrons moving in a circle would be accelerating, would lose energy, and
would therefore not be able to maintain their orbits.
O Protons would be required to emit electromagnetic radiation when accelerated.
O The Planetary system model requires a massless, positively charged matrix and
there is no evidence that this exists.
1 nts
Electrons moving in a circle would be accelerating, would lose energy, and would therefore not be able to maintain their orbits.
What are atomic models?Atomic models are designed to determine the nature of the atom. There have been several atomic models whose ultimate aim have been to underscore the interaction between the particles that compose the atom.
The atomic models include;
The Thompson modelThe Rutherford modelThe Bohr modelThe Wave mechanics modelThe main problem of the Planetary system model (Rutherford model) of the atom is that electrons moving in a circle would be accelerating, would lose energy, and would therefore not be able to maintain their orbits.
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What would the pH of a solution that had a hydroxide ion concentration of 4.9 x 10-5 M be?
Taking into account the definition of pH and pOH, the pH of the solution is 9.69.
Definition of pHpH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH is defined as the negative base 10 logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions or H₃O⁺:
pH= - log [H⁺]= - log [H₃O⁺]
Definition of pOHSimilarly, pOH is a measure of hydroxyl ions in a solution and is expressed as the logarithm of the concentration of OH⁻ ions, with the sign changed:
pOH= - log [OH⁻]
Relationship between pH and pOHThe following relationship can be established between pH and pOH:
pOH + pH= 14
pH in this caseA solution had a hydroxide ion concentration of 4.9×10⁻⁵ M. This is [OH⁻]= 4.9×10⁻⁵ M. So, pOH is calculated as:
pOH= - log (4.9×10⁻⁵ M)
Solving;
pOH= 4.31
Replacing in the relationship established between pH and pOH, the pH can be calculated as:
pH + 4.31= 14
Solving:
pH= 14 - 4.31
pH= 9.69
In summary, the pH of the solution is 9.69.
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1. given 5 mols of the compound below what is the mol ratio between the compound and O? Ca_4Si_2O_6(CO_3)(OH)_2
2. Given 2 mols of the compound in problem one what is the mol to mol ratio os Si?
3. Given 5 mols of the compound in problem one what is the mol to mol ratio between the compound and Ca?
4. Given 3.5 mols of the compound in problem one what is the mol to mol ratio between the compound and C?
5. in the reaction below give the mol to mol ratio between the underlined species
Pb(NO_3)_2(ap)+2KI(aq) -> PbI_2(s)+2KNO_3(aq)
underline underline
The mole ratio of the compound and its constituent elements are as follows:
The mole ratio between the compound and O is 5 : 22The mole ratio between the compound and Si is 2 : 4The mole ratio between the compound and Ca is 5 : 20The mole ratio between the compound and C is 1 : 1What is mole ratio?Mole ratio is the ratio of the moles of one or more elements or compounds to another.
The given compound is Ca₄Si₂O₆(CO₃)(OH)₂
Moles of oxygen present in 1 mole of compound = 11 moles
Moles of Si present in 1 mole of compound = 2 moles
Moles of Ca present in 1 mole of compound = 4 moles
Moles of C present in 1 mole of compound = 1 mole
Given 5 moles of the compound below, the mole ratio between the compound and O is 5 : 22Given 2 moles of the compound below, the mole ratio between the compound and Si is 2 : 4Given 5 moles of the compound below, the mole ratio between the compound and Ca is 5 : 20Given 3.5 moles of the compound below, the mole ratio between the compound and C is 1 : 1Given the equation of the reaction below;
Pb(NO₃)₂ (aq) + 2 KI (aq) --> PbI₂ (s) + 2 KNO₃ (aq)the mole ratio of the reactants and products are as follows:
Pb(NO₃)₂ : 2 KI (aq) = 1 : 2Pb(NO₃)₂ : PbI₂ (s0 = 1 : 1Pb(NO₃)₂ : 2 KNO₃ (aq) = 1 : 2In conclusion, the mole ratio of reaction is the ratio in which moles of the substances combine.
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determine the pressure change when a gas at a constant volume at 7.0 atm is heated from 15°C to 70°C. Show your work
Answer:
33 atm
Explanation:
If all other variables are held constant, you can use Gay-Lussac's Law to find the pressure change:
P₁ / T₁ = P₂ / T₂
In this equation, "P₁" and "T₁" represent the initial pressure and temperature. "P₂" and "T₂" represent the final pressure and temperature. You can plug the given values into the equation and simplify to find P₂.
P₁ = 7.0 atm P₂ = ? atm
T₁ = 15 °C T₂ = 70 °C
P₁ / T₁ = P₂ / T₂ <----- Gay-Lussac's Law
7.0 atm / 15 °C = P₂ / 70 °C <----- Insert values
0.46667 = P₂ / 70 °C <----- Simplify left side
33 = P₂ <----- Multiply both sides by 70
Which class of biological molecule is made up of long hydrocarbon chains
and is not soluble in water?
A. Carbohydrates
OB. Nucleic acids
C. Lipids
OD. Proteins
Lipids are made up of long hydrocarbon chains and is not soluble in water.
Hence, Option C is correct answer.
What is Carbohydrates ?Carbohydrate is water soluble macromolecule because they are small polar molecules contains many -OH functional groups that makes it hydrophilic.
What is Nucleic acid ?Nucleic acids are long polymeric chain. They are hydrophilic in nature. Nucleic acid are soluble in water because of their polar nature.
What is Lipids ?Lipids are hydrophobic and they are generally water insoluble because lipids are non polar molecules. Lipids are oily or greasy molecules. Lipids are made up of glycerol molecule. It includes fatty acids.
Thus from the above conclusion we can say that Lipids are made up of long hydrocarbon chains and is not soluble in water.
Hence, Option C is correct answer.
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What would the hydrogen ion concentration be if the pOH was 6?
Answer:
10-6mol/l
Explanation:
hope i helped
Consider this reaction: 6 CO2 + 6 H₂O + light
C6H12O6 + 6 02
If you actually produced 30g of C6H12O6 what would be the percent yield?
Calculate the theoretical yield from having 2.38 x 10² g of H₂O, 18.6 moles of CO₂.
531.2 grams of oxygen and 608.22 grams of C6H12O6 make up the potential yield.
What is a Moles?A mole is the amount of a substance that contains precisely 6.02214076 X 1023 of the substance's fundamental components.If a material has the same mass as 12.000 g of 12C and the same number of elementary particles as atoms, it is said to have a mole of that substance.The mole can be used to determine the simplest compound formula and calculate the quantities needed for chemical reactions. Molarity, a related concept, comes in handy when discussing reactions in solutions. Molarity is the measure of how many moles of a solute are present per liter of a solution (M).Molecular quantities are those that cannot be measured in terms of grams or milligrams. This way, a mole counts the number of atoms, ions, or molecules.Determine the reaction's theoretical yield:
Given is the reaction: 6 CO2 + 6 H2O = C6H12O6 + 6 O2.
2.38 x 102 g of H2O are provided as the mass.
Given is 18.6 moles of CO2.
6 CO2 + 6 H2O → C6H12O6 + 6 O2
6 moles of H2O 1 mole of C6H12O6
1 mole of water equals 0.6 moles of C6H12O6.
18gm of H2O = 276/6 gm of C6H12O6
2.38*10^2 gm of H2O = ? gm of C6H12O6
[tex]=\frac{2.38*10^{2} *\frac{276}{6} }{18}[/tex]
[tex]=608.22gms[/tex] of C6H12O6
1 mole of C6H12O6 = 276gms
? moles of C6H12O6 = 608.22gms
= 608.22/276
= 2.2 moles of C6H12O6
6 moles of CO2 = 6 moles of O2
1 mole of CO2 = 1 mole of O2
∴ 18.6 moles of CO2 = 18.6 moles of O2
1 mole of O2 = 32gms of O2
∴18.6 moles of O2 = ? gm
= 18.6*32
= 531.2gms of O2
Hence 531.2 grams of oxygen and 608.22 grams of C6H12O6 make up the potential yield
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1. How many grams are in 5.17 moles of C12H22O11?
Answer:
1768.14
Explanation:
1. molar mass of C₁₂H₂₂O₁₁ is: M=12*12+22*1+16*11=342 [gr/mol];
2. the required mass, m=M*ν is: m=5.17*342=1768.14 [gr].
In this activity, you are tasked with designing an airbag for a company that creates airbags for automobiles. You must design the driver’s front airbag for a specific car model so it will protect the driver as effectively as possible. For this car, the airbag must have a volume of 58 liters when fully inflated. To provide an adequate cushion for the driver’s head, the air pressure inside the airbag should be 4.4 psi. This pressure value is in addition to the normal atmospheric pressure of 14.7 psi, giving a total absolute pressure of 19.1 psi, which equals 1.30 atmospheres.
The airbag is designed to produce the volume of nitrogen gas required to fill up the airbag.
What is the function of an airbag?An airbag is a bag which is designed to self-inflate and serve as a cushion for the head and neck of a driver to prevent injuries when an impact occurs head-on on the car.
The gas that inflates the airbag is nitrogen which is produced from sodium azide according to equation below:
2NaN₃ → 2Na + 3N₂In conclusion, the design of the airbag is such that the correct amount of sodium azide is present to produce the volume of nitrogen required to fill up the airbag.
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A 5ml solution containing ph of 3.5 was mixed with a solution containing ph of 10.5
What will you expect the pH of the mixture be? Basic, acidic, or neutral? Also provide the pH of the combined solution.
The resulting solution will be neutral having a pH of 7.
What is the pH?The term pH is defined as the hydrogen ion concentration in solution. We know that the pH is inversely related to the hydrogen ion concentration in solution.
We know that the reaction between an acid and a base produced a salt. In this case, the salt that is produced is neutral because the acid is completely reacted with the base.
Since the solution contains a mixture of a containing pH of 3.5 and that of a pH of 10.5, the resulting solution will be neutral having a pH of 7.
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hydrolysis of 1-cyano-2-methylbenzene proceeds slower than 1-cyano-4-methylbenzene. give structures and explain why?
Answer:
Hydrolysis of 1-cyano-methylbenzene is an addition reaction while that of 1-cyano-4-methylbenzene is a substitution substitution reaction.
Explanation:
substitution reactions occur in preference to addition reactions
What is 0.0094x10^2 in scientific notation
Answer:
9.4x10^-1
Explanation:
You have to move the decimal left 3 times so you subtract 3 from the power (2) and get -1
Which of these terms is used to describe a solution that results when both the salute and solvent are solid. Is it alloy, surface solution or aqueous solution
The terms is used to describe a solution that results when both the salute and solvent are called alloys
What are alloys?Alllys simply refers to mixture of a solid metal made by combining two or more metallic elements.
There exist alloys of
NickelCoppersBrassIn conclusion, the terms is used to describe a solution that results when both the salute and solvent are called alloys
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What does h20 mean on the periodic elements chart
Answer:
The compound, H₂O, will not be found on the periodic table. This is because the periodic table only consists of individual elements. That being said, the elements found within H₂O are located on the periodic table. H₂O consists of hydrogen, denoted by the symbol "H", and oxygen, denoted by the symbol "O". The subscript (the 2) tells us that there are 2 hydrogen atoms located in the H₂O molecule.
Hydrogen is the first element listed on the periodic table and can be found in the top leftmost position. Oxygen is the eighth element on the periodic able and is located in the second row at the top right.