Answer:
= 0.28M
Explanation:
data:
volume = 0.250 L
= 0.250dm^3 ( 1litre = 1dm^3)
moles = 0.70 moles
Solution:
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.70 / 0.250
molarity = 0.28 M
Chemical Reactions
Substances in a fire extinguisher help prevent air from reaching a burning material. Why would this be a good way to fight a fire?
Answer:
It works by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out which is what the fire extinguisher does.
What is the mass percent of a sugar solution when 489 grams of sugar is combined with 877 grams of water?
Can someone please answer this.
How do you know the correct number of significant figures to include in an answer?
Answer:
Explanation:
1 Non-zero digits are always significant.
2 Any zeros between two significant digits are significant.
3 A final zero or trailing zeros in the decimal portion ONLY are significant.
oxidation of Nitrogen in N2O3
Explanation:
oxidation of Nitrogen in N2O3 is +36. How much of 0.25 M KI solution, in liters, is required to completely precipitate all the Pb²+ in
0.125 L of 0.75 M Pb(NO3)2?
2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3
Please help me
The amount of 0.25 M KI solution is needed is 0.38 L.
What is solution?Solution is defined as a homogeneous mixture of two or more substances in relative amounts that can be continually altered up to what is known as the limit of solubility.
It can also be defined as a combination of one substance dissolved in another with the same properties throughout.
The solution can be homogenous or heterogenous mixture.
2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3
As per the reaction
The ratio is KI : Pb(NO3)2 is 1:1
So, we use M1V1 = M2V2
As given, M1 = 0.25 M
M2 = 0.75 M
V2 = 0.125 L
So, V1 = M2 V2 / M1
V1 = 0.75 x 0.125 / 0.25
V1 = 0.38 L
Thus, the amount of 0.25 M KI solution is needed is 0.38 L.
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Scientific knowledge can withstand the test of time because
A.
scientific theories have been proven beyond doubt.
B.
advancements in technology have no impact on science.
C.
exceptions can be made regarding scientific laws.
D.
it is open to change as new evidence or data is discovered.
Answer:
D
Explanation:
I will mark brainliest
The equation which is balanced is S₈ + 12O₂ → 8SO₃.
What is balance reaction?Balanced reactions are those reactions in which all entities are present on the reactant side as well as on the product side of the reaction.
6S₈ + 8O₂ → 6SO₃Above equation is unbalanced as all atoms are not present in same amount.
2S₈ + 3O₂ → 2SO₃Above equation is unbalanced as all atoms are not present in same amount.
S₈ + 12O₂ → 8SO₃Above equation is balanced as all atoms are present in same amount on reactant side as well as product side.
S₈ + 24O₂ → 8SO₃Above equation is unbalanced as all atoms are not present in same amount.
Hence, S₈ + 12O₂ → 8SO₃ is a balanced equation.
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PLEASE HELP ME! do tectonic plates play a major or minor role in the ROCK CYCLE
i will choos e branliest
What is 0.0032 gallons in mL?
Answer:
14.547 ml
Explanation:
1 gallon= 4546.09 ml
Newton’s second law of motion
When an object of mass 2Kg and applied force is 10N then acceleration is 5 m/s/s.
What is Newton's second Law?Newton's second Law of motion will be represented as:
F = m.a, where
F = forcem = mass of objecta = accelerationAcceleration for the first row will be calculated as:
a = 10/2 = 5 m/s/sAcceleration for the second row will be calculated as:
a = 40/5 = 8 m/s/sMass for the third row will be calculated as:
m = 20/5 = 4kgMass for the forth row will be calculated as:
m = 45/45 = 1 kgForce for the fifth row will be calculated as:
F = (3)(3) = 9 NHence, acceleration of the object whose mass is 2kg and force on that object is 10N is 5m/s/s.
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How many moles of gas are in a 30-liter scuba canister if the temperature of the canister is 300 K and the pressure is 15,200 torr?
Answer:
n = 0.487⋅mol
Explanation
n=PVRT
=0.4⋅atm×30⋅L0.0821⋅L⋅atm⋅K−
1⋅mol−1×300⋅K
=0.487⋅mol
Ethanol is found to have a relative molecular mass of 46. If its molecular formula is C2HxOH. What is the value of X in the formula?
Answer:
The value of x in ethanol is 5
Explanation:
Given molar mass, you can subtract the molar masses of different elements present to find the missing amount of hydrogen; in other words:
Carbon*2 + Hydrogen*x + Oxygen*1 + Hydrogen*1 = 46
Molar mass carbon = 12.01
Molar mass hydrogen = 1
Molar mass oxygen = 16
12.01*2 g/mol + 1*x g/mol + 16*1 g/mol + 1*1 g/mol = 46 g/mol
Subtracting all knowns from the current molar mass gives
46 - 41.02 = 4.98
This means that x amounts of hydrogen has a molar mass of 4.98, or roughly just 5. Since each hydrogen has a molar mass of one, that means that there are 5 hydrogens missing and the complete molecular formula is C2H5OH
condenation means what
Answer: Heyaa! :)
Condensation is the process of water vapor turning back into liquid water!
Explanation:
Hopefully this helps you!
-Matthew ~
How do molecular shape affect polarity
write the action of aqua regia on gold
Answer:For alloys greater than 14 K, aqua regia is used to test the gold. Aqua regia dissolves gold itself (as well as dissolving the silver and copper components) and for this reason it is used to test higher karat gold alloys.
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If 0.15M solution of HNO2 has a pH of 1.98, determine the % ionization of HNO2.
The % ionization of HN0₂ is 6.98 %
What is percentage Ionization ?
The relative strengths of acids may be determined by measuring their equilibrium constants in aqueous solutions.
In solutions of the same concentration, stronger acids ionize to a greater extent, and so yield higher concentrations of hydronium ions than do weaker acids.
Percentage Ionization is the measure of the strength of an acid is its percent ionization.
The percent ionization of a weak acid is the ratio of the concentration of the ionized acid to the initial acid concentration, times 100:
The chemical equation for the dissociation of the nitrous acid is:
HNO₂(aq)+H₂O(l)⇌NO²⁻(aq)+H₃O⁺(aq).
[tex]\rm \% \;ionization = \dfrac{[H_{3}O^{+} ] _{eq} }{[HNO_{2}]_{0} } \times 100[/tex]
[tex]\rm 10^{-pH} =[/tex] [H₃O⁺] ,
we find that with given pH of 1.98
[tex]10^{-1.98} =[/tex] 0.01047128548 M=[H₃O⁺]
Molarity of HN0₂ = 0.15 M
so that percent ionization is
[tex]\% ionization = \dfrac{0.01047128548 }{0.15 } \times 100[/tex]
[tex]\% ionization = 6.98 \%[/tex]
Therefore the % ionization of HN0₂ is 6.98 %
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What is the volume of 300. g of mercury vapor at 822K and 0.900 atm?
Answer:
112.2L
Explanation:
Volume (V) = 300g
Temperature (T) = 822K
Pressure (P) = 0.9atm
using the ideal gas equation;
[tex]PV = nRT\\\\ V = \frac{nRT}{P}[/tex]
Molar gas constant (R) = [tex]0.0821L.atm/mol.K[/tex]
Mole (n) = [tex]\frac{Mass (m)}{Molar mass (M)}[/tex] Molar mass of Mercury = 200.59g/mol
[tex]n = \frac{300g}{200.59 g/mol} \\[/tex]
= 1.496mol
Now, the volume can be calculated;
V = [tex]\frac{1.496mol* 0.0821L.atm/mol.K*822K}{0.9atm}[/tex]
∴Volume of mercury = [tex]112.2L[/tex]
all the living and nonliving things in an specific area
Answer: An Ecosystem
Explanation:
which of the following is an example of gentic engineering?]
A. A string of animo acids bonded together to form a protein that controls a trait
B. In the nucleus of a human cell, DNA strands sepreate and are used as a template for a new RNA molecule.
C. A string of three bases within an RNA molecule codes for a specific anmio acid.
D. A bacterial cell produce human insullian because human DNA has been added to the bacterial DNA.
12) Which statement is not a component of the particle kinetic molecular theory of matter? A) Atoms of different elements are identical. B) Particles of matter have spaces between them. C) Particles of matter are constantly in motion. D) Atoms of the same element are essentially identical.
Answer:
c i got it right on usatestprep
Explanation:
............
As the temperature of a gas increases, the volume of the gas will______ if the pressure remains the same
Answer:
increasesExplanation:
The volume of the gas increases as the temperature increases. As temperature increases, the molecules of the gas have more kinetic energyAnswer:
Explanation: stay the same
Which statement illustrates the difference between a chemical reaction and a nuclear reaction?
a. A nuclear reaction releases more energy per gram and appears to violate the law of conservation of mass.
b. A nuclear reaction releases less energy per gram and appears to violate the law of conservation of mass.
c. A nuclear reaction releases more energy per gram but does not appear to violate the law of conservation of mass.
d. A nuclear reaction releases less energy per gram but does not appear to violate the law of conservation of mass.
A student hits a nail with a hammer. During the collision, there is _____.
Group of answer choices
a force on the hammer but not on the nail
a force on the nail but not on the hammer
a force on the nail and also on the hammer
no force on either object in the collision
for the balanced equation: 2P + 3Br2 -> 2PBr2, how many moles of P reacted, if 0.175 moles of Br2 are produced
If you were to look up at the moon and see the shape of the moon as a circle, what would the next observable shape in the cycle of the moon be? (2 points)
Group of answer choices
Crescent
Full circle
Half circle
Answer:
Half circle
Explanation:
because in the next day between 5O'clock the sun will rise then the moon will therefore created to be in a half moon
oxidation of Nitrogen in NO2
Explanation:
oxidation of Nitrogen in NO2 is +4
state the equation for the formation of ethane from its elements and ghen detwrmine the value for the standard enthalpy of formation of ethane
The standard enthalpy of formation of ethane is determined as -192.5 kJ/mol.
Reaction for the formation of ethaneThe reaction for the formation of ethane is given as;
2C + 3H₂ → C₂H₆
Where;
C is carbon (graphite)H is hydrogen C₂H₆ is ethaneStandard enthalpy of formation of ethaneThe standard enthalpy of formation of ethane is calculated as follows;
ΔH = ΔH₁ + ΔH₂ + ΔH₃
where;
ΔH₁ is heat of formation of graphite = -286 kJ/molΔH₂ is heat of formation of hydrogen = -393.5 kJ/molΔH₃ is heat of formation of ethane = 1560 kJ/mol2C + 3H₂ → C₂H₆
ΔH = 2(-286) + 3(-393.5) + 1(1560)
ΔH = -572 - 1180.5 + 1560
ΔH = -192.5 kJ/mol
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Determine weather each of the following will be saturated or unsaturated at 50 degree celcious
The solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.
What are saturated and unsaturated solutions?Saturated solutions are solutions which contains as much solute as they can dissolve at that temperature in the presence of undissolved solute.
An unsaturated solution is a solution which contains less solute than it can dissolve at that temperature.
The solubility of a solute determines whether its solution will be saturated or unsaturated at a given temperature.
Therefore, the solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.
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Question 6
2 pts
The illustration shows all the forces in Newtons (N) acting on a box. The sum of all the
forces acting on the box results in a force acting on the box
5N
5N
O NF= 10 N balanced
O NF= 5N to the right
O NF= 0 Balanced
NF= 5N to the left
Answer:
Im pretty sure that 5N to the Right is correct answer
