Explanation:
HCl can be obtained with different concentrations of HCL in water.
If for example, you purchased 37.2% HCL it would have a density of 1.2 g/mL. The molecular weight of HCl is 36.46 g/mole
1.2g/mL x 1000 ml/L = 1200 g/L = 1200g/L x 0.372 =(446.4g HCl/L)/36.46 g/mole = 12.2 M/L HCl
To prepare a 2M solution:
V1 = ?, M1 = 12.2M
V2 = 1L, M2 = 2M
V1*M1=V2*M2
V1 = (V2*M2)/M1
V1 = 1*2/12.2 = 0.164 L or 164 mL of 12.2M HCl diluted to 1 Liter with water will yield a 2M solution.
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Someone please help? I've had a go at this myself (see picture of working attached) but not sure where to go from there?
75ml of a solutipn of 0.1mol l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
Answer:
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and
the value of x in
HxA is 3
Explanation:
75ml of a solutipn of 0.1moL l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
the concentration of both the and the base are the same at 0.1M
the base...NaOH has 0.1 moles/L of OH ion
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and the value of x in
HxA is 3
how many atoms of zinc are required to weigh 5.4 ng
Answer:
4.97 X 10^13 ATOMS OF Zn
Explanation:
how many atoms of zinc are required to weigh 5.4 ng
a nano gram is 10^-9 grams
Zinc has an atomic mass of 65.39 gm/moles
there is an Avogadros number of atoms in a mole
65.39 GRAMS PER MOLE
65.39 g/(6.022 X 10^23)how many atoms of zinc are required to weigh 5.4 ng
GRAMS PER ATOM
1.086 GRAMS PER 1O^22 ATOMS
1 atom of Zn weighs 1.086 X 10^9 X 1O^-22 n grm=
1,086 X 10^-13 n gm
Y tines 1.086 X 10^-13 = 5.4 n gm
Y = 5.4/ (1.086 X 10^-13) =
4.97 X 10^13 ATOMS OF Zn
CHECK
(4.97 X 10^13 ) X 65.39 gm/(6.022 X 10^23) =
5.397 X 10^-9 =
5.4 n g
4.6 CONCEPT ASSESSMENT Suppose that each of these reactions has a 90% yield. CH4(g) + Cl2(g) - CH2Cl(g) + HCl(g) CH3Cl(g) + Cl2(g) - CH2Cl20) + HCl(g) Starting with 50.0 g CH4 in the first reaction and an excess of Cl2(g), the number of grams of CH2Cl2 formed in the second reaction is (a) 50.0 X 0.81 x (85/16) (c) 50.0 X 0.90 X 0.90 (b) 50.0 X 0.90 (d) 50.0 X 0.90 X 0.90 < (16/50.5)(70.9/85)
Answer:
212 gm of CH2Cl2 are formed
Explanation:
4.6 CONCEPT ASSESSMENT Suppose that each of these reactions has a 90% yield. CH4(g) + Cl2(g) - CH2Cl(g) + HCl(g) CH3Cl(g) + Cl2(g) - CH2Cl20) + HCl(g) Starting with 50.0 g CH4 in the first reaction and an excess of Cl2(g), the number of grams of CH2Cl2 formed in the second reaction is (a) 50.0 X 0.81 x (85/16) (c) 50.0 X 0.90 X 0.90 (b) 50.0 X 0.90 (d) 50.0 X 0.90 X 0.90 < (16/50.5)(70.9/85)H
1st, rewrite the equations so you can see the problem easier
reaction (1) CH4 +Cl2--------->CH3CL + HCl
reaction (2) CH3Cl + Cl2------> CH2Cl2 + HCl
the product ib reaction (1) is CH3Cl and is formed with a 90% yield.
90% of the reactant methane iis converted to methyk chloride.
methane (CH4) has a molar mass of 12 + 4X1 =16
you start with 50.0 gm of CH4,
SO
50.0/16 =3.125 moles of CH4
90% of this become methyl choride...CH3Cl
SO
0.90 X 3.125 = 2.8 moles of CH3Cl are formed
NOTE 90% HAS ONLY 2 SIGNIFICANT FIGURES SO YOU ARE LIMITED TO 2 SIGNIFICANT FIGURES IN YOUR CALCULATION!
in reaction(2) 1 mole of methyl chloride becomes methyl dichloromethane yi
with again a 90% yield
0.90 X 2.8 = 2.5 moles of CH2Cl2 are formed
so
2.5 moles of CH2Cl2 are formed.
CH2Cl2 has a molar mass of 12 + 2X1 + 2X35.5 =
12 + 2 + 71 =85
1 mole weighs 85 gm
2.5 moles weigh 2.5 X 85 = 212 gm
X
how do you separate the following mixture? Name only the process involved .
1.Sand and salt
Answer:
Just dissolve in water , you can separate
Explanation:
because salt dissolves in water but sand doesn't
Explanation:
sedinentation and decantation
can someone please help me i need this done rn
Read the etymology entry.
antagonize
antagonize (v.) 1630s, "to compete with" (obsolete); 1742, "act in opposition to, struggle against continuously,"
from Greek antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai
"to contend for a prize," from agon "a struggle, a contest" (see agony). Meaning "make antagonistic" is by 1882.
What original language did the word antagonize come from?
O Greek
O Latin
O Middle French
O Middle English
Answer:
latin
Explanation:
im not sure sorry if wrong
Answer:
Greek
Explanation:
Mid 17th century (in the sense 'compete with'): from Greek antagōnizesthai, from ant- 'against' + agōnizesthai 'struggle' (see agonize).
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
Answer:
is 2K(s)+2H2O(l)→2KOH(aq)+H2(g).
Explanation:
Answer:
pls explain better so we understand
1. Write a balanced equation for the precipitation of calcium carbonate from potassium carbonate and calcium chloride.
Answer:
K2CO3(aq) + CaC12(aq) –> CaCO3(s) + 2Cl(aq) 2.
Explanation:
What is the answer to this question
Answer:
(i) of protons
(ii) total number of both protons and neutrons
(b)they are neutral or have no overall charge because there are equal numbers of negative electrons to positive protons
Explanation:
Since both charges are equal, the number of positive protons cancels the number of negative electrons, thereby making the atom neutral
How many moles of the excess reagent would there be if 2.8mol of N2 were reacted with 15.1mol of H2O?
N2+4H2O ---> 2H2O2+N2H4
The number of moles of the excess reagent there would be is 3.9 moles
From the question,
We are to determine the number of moles of the excess reagent there would be.
The given balanced chemical equation is
N₂ + 4H₂O → 2H₂O₂ + N₂H₄
This means,
1 mole of N₂ is required to react completely with 4 moles of H₂O
Now,
If 1 mole of N₂ is required to react completely with 4 moles of H₂O
Then,
2.8 moles of N₂ will react completely with 11.2 moles of H₂O
∴ H₂O is the excess reagent
Number of moles of H₂O that would remain = 15.1 mol - 11.2 mol
Number of moles of H₂O that would remain = 3.9 mol
Hence, the number of moles of the excess reagent there would be is 3.9 moles
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question is in the pic
Answer:
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Explanation:
Which object represents a heterogeneous
mixture
Answer:
oil and water
Explanation:
oil and water - When you put oil and water together they do not mix. Therefore, these are a heterogeneous mixture since they are two separate parts.
Compuesto organico que no existe como alqueno ni alquino?
Answer:
Susssssssssssssssy
Explanation:
Sup
The Temperature of the earth gets______ as you get closer to the _______ and ________ as you move towards the_____
What type of energy is best described as the energy required to break the bonds present in the reactants?
A
activation energy
B
potential energy
С
kinetic energy
D
thermal energy
hay
Answer:
b
Explanation:
Haty
The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
What is Exothermic Reaction ?The chemical reaction which releases energy are known as exothermic reaction. Bond forming is exothermic process. Activation energy is needed to initiate the reaction. In exothermic reaction potential energy converted into kinetic energy.
What is Endothermic Reaction ?The chemical reaction which absorbs heat from the surrounding is known as endothermic reaction. Bond breaking is endothermic reaction. Activation energy is needed to initiate the reaction. In endothermic reaction kinetic energy converted into potential energy.
Thus, from the above conclusion we can say that The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
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What happens to the pH of a solution is the concentration of hydronium ions decrease
Which of the following statements about elements in their compounds is false?
A) Some second row elements may have 7 or fewer valence electrons.
B) Most second row elements have 8 valence electrons.
C) Third row elements almost never have fewer than 8 valence electrons.
D) Third row elements may have more than 8 valence electrons.
E) Some second row elements may have more than 8 valence electrons.
Answer:
answer is A some second row elements may have 7 or fewer valance electronExplanation:
because as we know second row elements are from Li up to Ne; their atomic number is from 3 - 10 and when we work their electron configuration only the inert gas neon have 8 valance electrons ; the others have 7,6,5,4,3,2,1 from F up to Li respectively so the statement is true other alternatives like b it is not true because there is one element only having 8 valance electrons so it is not trueD and C are not true because outer most shell cannot occupey more than 8 electrons because of that those elements cannot have more than 8 valance electronsI think it is help ful for you
Which of the following statements are TRUE for BOTH oxygen and sulfur atoms?
a. contain the same number of valence electrons on their outermost shell
b. have the same number of complete shells
c. atomic sizes are nearly the same
d. they are able to form sigma and pi bonds
e. their-2 change anion is isolemectronic to neon
Answer:
b. have the same kind number of complete shells
Pls answer.............
Answer:
Ductile
Explanation:
The metal is ductile, and that is why it can be stretched into wires.
What is the concentration of an AlCl3 solution if 150 mL of the solution contains 350. mg of cr ion?
Answer:
the concentration of AlCl3 comes out to be 0.015 M.
Explanation:
In pic
(Hope this helps can i pls have brainlist (crown)☺️)
1. Assume samples that emit radiation are placed on a table across the room. Which sample will produce the greatest damage to you? Alpha emitter Beta emitter? Gamma emitter? WHY?
The damage caused by the radiations has been maximum for the gamma radiations.
What are charged radiations?The charged radiations are comprised of the molecules that have been comprised of the charged particles. The charged particles have been alpha, beta or gamma radiation.
The damage that has been caused by the radiation has been found with the intensity of the quality factor and the thickness of the molecule that comprises the amount of damage formed.
The maximum quality factor has been for the gamma radiation. Thus, gamma radiations form the basis for the maximum damage.
Learn more about gamma radiations, here:
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The small flag indicating wind direction on a station weather plot points in the direction that the wind is going.
True or False
Answer:
False
Explanation: The wind's direction is shown by a long shaft. it will point to the direction from which direction the wind is blowing.
A unit for measuring work is called the _____.
horsepower
effort
time
foot-pound
Answer:
A unit for measuring work is called the foot-pound
hly
A sample of a gas is in a sealed container. The pressure of the gas is 225 torr , and the temperature is 23 °C
. If the temperature changes to 97 °C with no change in volume or amount of gas, what is the new pressure,
P2, of the gas inside the container?
Answer: hello!
formula: P1/T1=P2/T2
P1= 225
T1= 23 C (296 K)
P2= ?
T2= 97 C (370 K)
equation: 225/296 = ?/370
Explanation:
you are going to start by cross multiplying 225 and 370.
225 x 370= 83250
now you are going to divide your answer by 296
83250 / 296= 281.25
so your answer for P1 is 281.25
. Why do we experience night and day? A. The moon blocks out the Sun during the night. B. The moon blocks sunlight from getting to one side of Earth. C.The side of Earth facing the Sun receives the sunlight. D.the side of Earth facing the Sun does not receive sunlight.
Hello Darling, it's because (C) The side of the Earth facing the Sun receives sunlight.
Hope this help~ ^^
Answer: C
The side facing the Sun receives the sunlight. The side that doesn’t face the sun downs’t recieve sunlight. The side that receives the sunlight experiences day, and the side that doesn’t receive sunlight experiences night.
:)
An element with 3 valence electrons would be a
0-3 anion
0 + 3 anion
+3 cation
0 - 3 cation
Answer:
0+3 anion
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
What are the causes and consequences of climate change
Answer: Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock.
Explanation: This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.
1. Much of a newborn baby’s skeleton is made of _______.
A. hard bone
B. soft bone
C. cartilage
D. ligaments
Answer:
cartilage bro newborn baby skeleton made up of
Answer:
Much of a newborn baby’s skeleton is made of Cartilage
C. Cartilage
At STP, which gas sample has the same number of molecules as 2.0 liters of CH4(g) at STP?
1.0 liter of c2h6(g)
2.0 liters of O2(g)
5.0 liters of N2(g)
6.0 liters of CO2(g)
Answer:
the same number of molecule 2.0 liters of o2(g) at STP
The gas sample that has the same number of molecules as 2.0 liters of CH4(g) at STP is 2.0 liters of O2(g).
What is the number of molecules of oxygen gas?
The number of molecules of oxygen gas at Standard Temperature and Pressure (STP) is determined as;
1 moles = 22.4 L = 6.02 x 10²³ molecules
from the question, 1 moles of CH4 = 2 liters = 1 moles of O2 occupying 2 liters.
Thus, the gas sample that has the same number of molecules as 2.0 liters of CH4(g) at STP is 2.0 liters of O2(g).
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My hypothesis is correct. The experiment and data show heavier objects bounce higher trampolines.
a. Conclusion
b. Experiment
c. Hypothesis
d. question
e. Data
The answer is A this is a conclusion.
