Answer: 1. There are [tex]0.20\times 10^{23}[/tex] molecules of sulfuric acid in the solution.
2. 0.093 moles of baking soda have been used.
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
1. [tex]\text{Number of moles of sulpfuric acid}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{3.2g}{98g/mol}=0.033moles[/tex]
1 mole of [tex]H_2SO_4[/tex] contains = [tex]6.023\times 10^{23}[/tex] molecules of sulfuric acid
Thus mole of [tex]H_2SO_4[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.033=0.20\times 10^{23}[/tex] molecules of sulfuric acid
There are [tex]0.20\times 10^{23}[/tex] molecules of sulfuric acid in the solution.
2. [tex]\text{Number of moles of baking soda}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{7.8g}{84g/mol}=0.093moles[/tex]
0.093 moles of baking soda have been used.
Which of the following correctly describes a Brønsted-Lowry base? A. It accepts protons. B. It donates protons. C. It produces OH− ions in solution. D. It donates an electron pair.
discharge by the combination of Nitrogen and oxygen
Answer:
NO2
Explanation:
N = Nitrogen
O = Oxygen
Answer:
NO. 2.
is the answer
hopes this helps
pls help as soon I will give brainlist
Answer:
1) Conditions necessary for rusting are:
a) Presence of atmospheric oxygen or air
b)Presence of water or moisture
2) For protecting the iron gate, we can paint it because the paint will coat it and protect it from atmospheric oxygen and water.
3) Magnesium, Carbon and Oxygen (MgCO₃)
What is the pH of a 6.4x10^-10 m OH- solutions
Answer:
pH: 4.80617997398
pOH: 9.19382002602
[H+]: 1.5625E-05
[OH-]: 6.4E-10
ACID
Hope it helps :)
A simple experiment to demonstrate that NaOH is a stronger alkali than NH3
Answer:
pH value test can be used to demonstrate that NaOH is a stronger alkali than NH3
Explanation:
pH value test can be used to demonstrate that NaOH is a stronger alkali than NH3. This is done by measuring the same volume of equal concentration of hydroxide and ammonia. A glass rod was dipped into 0.2 M of sodium hydroxide and 0.2 M of ammonia, each drop of solution was then placed on a pH paper matched with a color chart and the pH value was recorded.
The result showed that sodium hydroxide being a strong alkali would dissociate completely in aqueous solution thereby having a higher pH while ammonia would dissociate slightly/partially in aqueous solution thereby having a lower pH value
You make an iron (II) sulfate solution with a molarity of 2.1 M. If the solution is 500 mL total, how many grams of iron (II) sulfate is that?
Answer:
Explanation:
2.1>1000
?>500
(500×2.1)÷1000=1.05moles
Mass= molesx molar mass
1.05×(56+32+(16×4))
1.05×152=159.6g
50 POINTS! Fill in the chart below to identify and describe the functional groups associated with organic chemistry.
Name General Structure Properties/Uses
Alcohol
Aldehyde
Ketone
Fatty acid
Ether
Answer:
Alcohol
Structure: Alcohols are organic molecules assembled from carbon (C), oxygen (O), and hydrogen (H) atoms.
Property: The Boiling Point of Alcohols. Alcohols generally have higher boiling points in comparison to other hydrocarbons having equal molecular masses.
Aldehyde
Structure: DescriptionAn aldehyde is a compound containing a functional group with the structure −CHO, consisting of a carbonyl centre.
Property: The polarity of the carbonyl group notably affects the physical properties of melting point and boiling point, solubility, and dipole moment.
Ketone
Structure: A ketone is a functional group with the structure RC(=O)R', where R and R' can be a variety of carbon-containing substituents.
Property: Ketones are soluble in water but their solubility decreases with increase in the length of the chain.
Fatty Acid
Structure: a fatty acid consists of a straight chain of an even number of carbon atoms, with hydrogen atoms along the length of the chain and at one end of the chain and a carboxyl group (―COOH) at the other end.
Property: Fatty acids are solid at room temperature, while unsaturated fatty acids are liquid.
Ether
Structure: a class of organic compounds characterized by an oxygen atom bonded to two alkyl or aryl groups.
Property: An ether molecule has a net dipole moment due to the polarity of C-O bonds.
The functional group associated with ethanol is -OH, the aldehyde is -COH, the ketone is -CO, the fatty acid is -COOH, and ether is ROR.
The functional groups have been the atoms that have different constituents and properties with respect to other groups.
The functional group associated with the following groups has been:
Alcohol: It has been liquid at room temperature with the functional group -OH.Aldehyde: It has been soluble in water with the functional group -COH.Ketone: It has been soluble in water, with C=O in the structure as a functional group.Fatty acid: It has been a long chain acid, with the presence of carboxylic group -COOH.Ether: It has been the pleasant smelling compounds with the presence of the R-O-R group as the functional group.
The functional group associated with ethanol is -OH, the aldehyde is -COH, the ketone is -CO, the fatty acid is -COOH, and ether is ROR.
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Diagrams, tables, and graphs are used by scientists to
Answer:
Since most of the data scientist collect is quantitative, data tables and charts are usually used to organize the information • Graphs are created from data tables • hope that helps love!
Which structure below contains all of the others?
DNA
gene
chromosome
nucleus
Answer:
nucleus
Explanation:
The nucleus holds all the other things, keeping them safe and confined.
Answer:
Nucleus
Explanation:
It contains DNA which contains a GENE which contains a CHROMOSOME so its NUCLEUS
Which balanced equation represents an oxidation-reduction reaction?
Answer:
Oxidation states are used in chemistry solutions. It is a bond in which electron transfers easily from one nucleus to another nucleus.
Explanation:
Oxidation-reduction reactions have some rules.The oxidation state is 0 at an uncombined bond.The bond of oxidation reduction is +1 in alkeli metal. The bond in two metal is +2The oxidation reduction state at helogens is -1. It does not happened always.The oxygen bond in oxidation and reduction is -2. The sum of the oxidation state is equal to the compound charges.In this process the changes occur for any elements. Redox could be occur. Its oxidized and reduction reaction can be seen in this process.50cm3 of sodium hydroxide solution was titrated against a solution of sulfuric acid. The concentration of the sodium hydroxide solution was 20g/dm3. Work out the concentration of the acid in grams per litre if it took 25cm3 of acid to completely neutralise the alkali. The relative molecular mass of sulfuric acid is 98.
Answer:
49 g/L is the concentration of the acid
Explanation:
Firstly, we proceed to write the equation of reaction.
2NaOH + H2SO4 ——-> Na2SO4 + 2H2O
We can see that 1 mole of the base reacted with two moles of the acid.
kindly note that dm^3 is same as liter
Firstly, we need to get the concentration of the reacted sulphuric acid in g/L
we use the simple titration equation below;
CaVa/CbVb = Na/Nb
From the question;
Ca = ?
Va = 25 cm^3
Cb = 20 g/L
we convert this to concentration in mol/L
Mathematically, that is concentration in g/L divided by molar mass in g/mole
molar mass of NaOH = 40 g/mol
so we have; 20g/L / 40 = 0.5 mol/L
Vb = 50 cm^3
Na = 1
Nb = 2
Where C represents concentrations, V volumes and N , number of moles
Now, substitute the values;
Ca * 25/0.5 * 50 = 1/2
25Ca/25 = 0.5
So Ca = 0.5 mol/L
Now to get the concentration of H2SO4 in g/L
What we do is to multiply the concentration in mol/L by molar mass in g/mol
That would be 0.5 * 98 = 49 g/L
The concentration of the acid in grams per litre is 49g/L
From the question,
We are to determine concentration of the sodium hydroxide solution.
First, we will write a balanced chemical equation for the reaction.
The balanced chemical equation for the reaction is
2NaOH + H₂SO₄ → Na₂SO₄ + 2H₂O
This means,
2 moles of NaOH is required to completely neutralize 1 mole of H₂SO₄
From the formula
[tex]\frac{C_{A}V_{A} }{C_{B}V_{B} }=\frac{n_{A} }{n_{B} }[/tex]
Where
[tex]C_{A}[/tex] is the concentration of acid
[tex]C_{B}[/tex] is the concentration of base
[tex]V_{A}[/tex] is the volume of acid
[tex]V_{B}[/tex] is the volume of base
[tex]n_{A}[/tex] is the mole ratio of acid
[tex]n_{B}[/tex] is the mole ratio of base
From the question
[tex]V_{A}= 25 \ cm^{3}[/tex]
[tex]C_{B} = 20 \ g/dm^{3}[/tex]
Convert this to mol/dm³
Molar mass of NaOH = 40 g/mol
Using the formula
[tex]Concentration\ in \ mol/dm^{3} =\frac{Concentration\ in \ g/dm^{3}}{Molar\ mass}[/tex]
∴ Concentration of the NaOH in mol/dm³ = [tex]\frac{20}{40}[/tex]
Concentration of the NaOH in mol/dm³ = 0.5 mol/dm³
∴ [tex]C_{B} = 0.5 \ mol/dm^{3}[/tex]
and
[tex]V_{B} = 50 \ cm^{3}[/tex]
From the balanced chemical equation
[tex]n_{A} = 1[/tex]
[tex]n_{B} = 2[/tex]
Putting the parameters into the formula, we get
[tex]\frac{C_{A} \times 25}{0.5 \times 50}= \frac{1}{2}[/tex]
Now, this becomes
[tex]2 \times 25 \times C_{A}=0.5 \times 50 \times 1[/tex]
Then, we get
[tex]50 C_{A} = 25[/tex]
∴ [tex]C_{A} = \frac{25}{50}[/tex]
[tex]C_{A} = 0.5 \ mol/dm^{3} = 0.5 \ mol/L[/tex]
Now, we will determine the concentration in g/L
From the formula,
Concentration in g/L = Concentration in mol/L × Molar mass
From the question,
Molar mass of sulfuric acid = 98
∴ Concentration of the acid in g/L = 0.5 × 98
Concentration of the acid in g/L = 49 g/L
Hence, the concentration of the acid in grams per litre is 49g/L
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CHEMISTRY PUNKS PLEASE HELP ME OUT!!!!!!!!!!!!!!!!! PLS. ILL LOVE U FOREVER N EVER! any point stealers will be reported <3
Answer: 25.0 L
Explanation:
For this problem, we will need to use Boyle's Law.
Boyle's Law: P₁V₁=P₂V₂
Since we are looking for V₂, we can rewrite the equation.
V₂=P₁V₁/P₂
The pressure should be in atm, so let's convert kPa to atm.
P₁=100 kPa=0.99 atm
P₂=200 kPa=1.97 atm
Now that we know the pressure in atm, we can plug it into the equation and solve.
[tex]V_{2} =\frac{(0.99 atm)(50.0L)}{1.97atm}[/tex]
[tex]V_{2} =25.0 L[/tex]
If the temperature outside is 297 what is this temperature in degrees celsius
Answer:
147.222
Explanation:
It's a simple conversion.
What is chemical potential energy?
Answer:
It is the energy that is stored in bonds that hold particles together
Explanation:
What is the net ionic equation of
Mg(s) + Zn2+ + 2NO3 → Mg2+ + 2NO3 + Zn(s)?
A. Mg(s) → Zn(s)
B. Mg(s) + Zn2+ → Mg2+ + Zn(s)
C. Mg(NO3)2 + Zn(s) → Zn2+ + 2NO3 + Mg(s)
D. Mg(s) + Zn(NO3)2 (aq) → Mg(NO3)2(aq) + Zn(s)
Answer:
Mg(s)+Zn2+>>>>>Mg2++Zn(s) B
Explanation:
The net ionice quation of a reaction represents the net change in the reaction.Here the reaction proceeds to the formation of Mg²⁺ ion and metallic zinc. Thus option B is correct.
What is ionic equation?
A balanced equation of chemical reaction represents the perfect stoichiometric ratio of each reactants and products where each elements have to be equal in number in both side.
An ionic equation represents the ions involved in the reaction and the charges and coefficients of ions have to balanced each side.
In the electrolysis of magnesium and zinc electrodes, metallic magnesium oxidizes to Mg²⁺ions and Zn²⁺ ions reduces to metallic zinc. The NO³⁻- ions remains as same as in its aqueous state in the electrolyte.
Hence the net ionic equation is as written in option B.
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Calculate the number of moles of MgO if the mass of MgO (magnesium oxide) is 50 g?
Please help... I will mark the answer with brainlist...
Answer:
1.24mol
Explanation:
m(MgO)=50g
molar mass=40.30g/mol (i search in google coz dosnt have book)
n=mass/molar mass
=50/40.30
=1.24mol
Which one is NOT an acid?
A. H2S04 B. H2NO3 C. HCI D. NaOH
Which of the following statements is true?
A. Every organism is made of different elements.
B. All living things are made of the same elements.
C. Every species is made of different elements.
D. All matter is made of the same 10 elements.
Answer:
Every species is made of different elements.
Explanation:
Living organisms are classified by their species. Species refer to a group of closely related individual organisms which are callable of interbreeding with each other and exchanging genetic material.
Member of a species have similar genetic make up and often look alike, it is the lowest taxonomic rank of closely related organisms.
Members of of different species are often composed of different elements. Since individual organisms are members of a given species, we can say that every species of organisms are made up of different elements.
What is the molarity of a solution that contains 6 moles of NaCl in 3 L of solution?
a
2.0 M
b
0.5 M
c
0.25 M
d
18.0 M
Answer:
a
2.0 M
Explanation:
divide 6by 3
formula : molarity=moles divided by volume of solutions
The pressure exerted by 0.002 moles of a gas in a 500 mL container at 25oC is:
Answer:
0.1715 atm
Explanation:
We use the Ideal gas equation to calculate this
Mathematically;
PV = nRT
rearranging, we have
P = nRT/V
from the question, we have
n = 0.002 moles
R = 0.082
T = 250 = 250 + 273 = 523 K
V = 500 ml = 500/1000 = 0.5 L
Plugging the values we have;
P = (0.002 * 0.082 * 523)/0.5
P = 0.1715 atm
Which process occurs at each link in a food chain?
Some Energy is released into the environment as heat
Explanation:
Why would cooking equipment be responsible for more total fires but smoking smoking responsible for more fire deaths?
Answer:
For the last few decades fires started by any type of smoking material has been the number one leading cause for household fire fatalities. It could just be that people luckily escape in time with cooking equipment fires, and smoking related fires just result in more deaths.
which of these methods could are used to separate an insoluble solid and soluble solid
Answer:
To separate an insoluble solid from a soluble solid: Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid.
Explanation:
Answer:
Mixing the mixture with water, filtering out the insoluble solid, and then evaporating the water to isolate the soluble solid
Kinetic energy definition
Answer:
kinetic energy. (General Physics) the energy of motion of a body, equal to the work it would do if it were brought to rest. The translational kinetic energy depends on motion through space, and for a rigid body of constant mass is equal to the product of half the mass times the square of the speed.
Answer:it is the simplest one
the energy possessed by a body due to its motion is called kinetic energy
K.E.=[tex]\frac{1}{2}[/tex]mv²
What is the temperture at which all molecular movements stop called
Answer:
Absolute Zero
Explanation:
at 0 Kelvin, nothing can move and entropy reaches 0
Answer:
absolute zero
Explanation:
A 14.00-g piece of iron absorbs 1000 joules of heat energy, and its temperature changes from 25°C to 125°C. Calculate the specific heat capacity of iron.
Answer:
THE SPECIFIC HEAT OF IRON IS 0.714 J/g °C
Explanation:
Heat absorbed = 1000 J
Mass of the piece of iron = 14 g
Temeperature changes = ( 125-25)°C= 100°C
specific heat of iron = unknown
To find the specific heat of iron in the question use the formula of heat
Heat = mass * specific heat * temperature change
Specific heat = Heat / mass * temperature change
Specific heat = 1000 / 14 * 100
Specific heat = 1000 / 1400
Specific heat = 0.714 J/g °C
So therefore, the specific heat of iron is 0.714 J/g °C
What is the voltage of an electrolytic cell with copper and magnesium
electrodes?
A. 2.71 V
B. -2.71 V
C. 2.03 V
D. -2.03 V
Answer:
A. 2.71 V
Explanation:
The standard reduction potential, E° of the metals are as follows:
Mg²⁺ + 2e⁻ ⇌ Mg; E° = -2.372
Cu²⁺ + 2e⁻ ⇌ Cu; E° = +0.337
Since magnesium has the the lower E°, it will serve as the anode in the electrolytic cell while copper will serve as the cathode.
At the anode; Mg ⇌ Mg²⁺ + 2e⁻, E° = -2.372
At the cathode; Cu²⁺ + 2e⁻ ⇌ Cu, E° = +0.337
EMF of the cell = E° cathode - E° anode = 0.337 - (-2.372) = 2.71 V
Therefore, EMF of the cell is 2.71 V
Answer:-2.71 is the correct answer
Explanation:
A P E X
Twenty liters of NO gas react with excess oxygen. How many liters of NO2 gas are produced if the NO gas reacts completely?
Answer:
2O L
Explanation:
The balanced chemical equation is 2NO+O
2
→2NO
2
Thus, 2 moles of NO will produce 2 moles of NO
2
.
Also, the volume is directly proportional to the number of moles.
Therefore, 20 L of NO will produce 20×
2
2
=20 L of NO
2
Un hidrocarburo tiene como composición en masa: C= 85.8% ; H= 14.2% . Como dato nos brindan que una molécula de este compuesto pesa: LaTeX: 2.1x10^{-22}g2.1 x 10 − 22 g. Hallar la fórmula molecular. Datos: P.A (uma): C=12, H=1
Answer:
[tex]C_{9.042}H_{17.958}[/tex]
Explanation:
(This exercise has been written in Spanish and for that reason explanation will be held in such language)
Por la definición del Número de Avogadro, un mol del compuesto contiene [tex]6.022 \times 10^{23}[/tex] moléculas. La masa de un mol se determina mediante regla de tres simple:
[tex]x = \frac{6.022\times 10^{23}\,molecules}{1\,molecule} \times (2.1\times 10^{-22}\,g)[/tex]
[tex]x = 126.462\,g[/tex]
Las participaciones másicas del carbono y el hidrógeno son, respectivamente:
[tex]m_{C} = 0.858\cdot (126.462\,g)[/tex]
[tex]m_{C} = 108.504\,g[/tex]
[tex]m_{H} = 126.462\,g - 108.504\,g[/tex]
[tex]m_{H} = 17.958\,g[/tex]
Ahora, el número de moles de cada elemento es calculado a continuación:
[tex]n_{C} = \frac{108.504\,g}{12\,\frac{g}{mol} }[/tex]
[tex]n_{C} = 9.042\,mol[/tex]
[tex]n_{H} = \frac{17.958\,g}{1\,\frac{g}{mol} }[/tex]
[tex]n_{H} = 17.958\,mol[/tex]
La fórmula molecular del hidrocarburo es:
[tex]C_{9.042}H_{17.958}[/tex]
How are industrial and agricultural pollution similar?
Answer:
Both of them are polluting the environment. Industrial pollution is the pollution caused from industries and it can be in different forms such as water waster or air pollution. Agricultural pollution is caused from plants or crops that are grown by the farmers. For example, pesticides that may ruin the soil and is dangerous for our environment.
Explanation: