Answer:
262.8 g
Explanation:
Molarity = 3.0M
Mass = ?
Volume = 2.40L
The relationship between these quantities is given as;
Molarity = Number of moles / Volume
Number of moles = Molarity * Volume
Number of moles = 3 * 2.4 = 7.2 mol
Mass = Number of moles * Molar mass
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass = 7.2 * 36.5 = 262.8 g
Answer:
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
Explanation:
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is calculated as the number of moles divided by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case:
Molarity= 3 MNumber of moles of solute= ?Volume of solution= 2.4 LReplacing:
[tex]3 M=\frac{number of moles of solute}{2.40 L}[/tex]
and solving you get:
number of moles of solute= 3 M* 2.40 L
number of moles of solute= 7.2 moles
Being the molar mass of HCl 36.45 g/mole, then you can apply the following rule of three: if 1 mole has 36.45 grams, 7.2 moles how much mass does it have?
[tex]mass of HCl=\frac{7.2 moles*36.45 grams}{1 mole}[/tex]
mass of HCl= 262.44 grams
262.44 grams of HCl is contained in 2.40 L of a 3.0 M solution.
Question 3 please help :)
Explanation:
Removing B from the system
- Decreases the rate of the reaction. Backward reaction (formation of reactants) is favoured.
Crushing A into a powder
- Increases the rate of reaction. This is because of the increased surface area of A.
Warming the system
- Increases the rate of the reaction. Temperature is proportional to rate of reaction.
Adding more A to the system
- Increases the rate of reaction. Forward reaction (formation of products) is favoured.
Putting the system into an ice bath
- Decreases the rate of reaction. Temperature is proportional to rate of reaction.
Decreasing the pressure of the system
- Decreases the rate of the reaction.
The primary role of ATP is to _______ by transferring a phosphate group to a molecule and forming ADP.
A
provide energy for cellular work
B)
produce heat energy
C)
reduce the activation energy of a reaction
D)
take energy from cellular work
Answer:
A) provide energy for cellular work
Explanation:
The Adenosine triphosphate (ATP) molecule is the nucleotide known in biochemistry as the "molecular currency" of intracellular energy transfer; that is, ATP is able to store and transport chemical energy within cells. ATP also plays an important role in the synthesis of nucleic acids.
ATP always GIVES ENERGY
wuuutttttt....help me
_Al + _Fe(NO3)2 -->_Fe + __Al(NO3)3
Which of the following masses is the greatest?
Answer:
4.2 gigagrams
Explanation:
kilo = 1,000
giga = 1,000,000,000
milli = .001
At what point is a base no longer added during a titration?
A. when the pH increases suddenly in the flask
B. when the phenolphthalein remains clear in the flask
C. before the solution in the flask reaches the equivalency point
D. before half of the base is completely drained from the burette
Answer:
when the pH increases suddenly in the flask
Explanation:
I think it's right. :)
When the pH increases suddenly in the flask at that point is a base no longer added during a titration.
What is titration?Titration is a typical quantitative chemical analysis procedure used in laboratories to quantify the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution with a known concentration as well as volume.
What is pH?The pH scale, which originally stood for "potential of hydrogen," is used to describe the acidity as well as basicity of aqueous solutions. The pH of acidic solutions is lower than that of basic as well as alkaline solutions.
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which factor prompts flowering in most plants?
How much water is needed to prepare a .50 molal solution using 0.50 moles of sodium chloride??
The amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
How to calculate volume?The volume of a solution can be calculated using the following formula:
Volume = no of moles ÷ molarity
According to this question, 0.50 molal solution is used to prepare 0.50 moles of sodium chloride. The volume of the solution is calculated as follows:
Volume = 0.50 moles ÷ 0.5M
Volume = 1L
Therefore, the amount of water needed to prepare a 0.50 molal solution using 0.50 moles of sodium chloride is 1L.
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Which of these results in kinetic energy of an object? position mchotion
Answer:
..... yep
Explanation:
tep no yep no hyshshshss
motion results in the kinetic energy of an object
What is the net ionic equation for the reaction below?
2H+ + CO32– + 2Na+ + 2OH– 2Na+ + CO32– + 2H2O
Answer:
The given reaction in your problem is the ionic equation for an acid (carbonic acid) reacting with a base (sodium hydroxide). All components of the reaction are then written in ionic form except for reactant weak electrolytes and the driving force product compound of the reaction (H2O). See following explanation.
Explanation:
Metathesis Rxn: molecular equation of rxn
H₂CO₃(aq) + 2NaOH(aq) => Na₂CO₃(aq) + 2H₂O(l)
Ionic Equation: shows all components of the reaction
H₂CO₃(aq) + 2Na⁺(aq) + 2OH⁻(aq) => 2Na⁺(aq) + CO₃²⁻(aq) + 2H₂O(l)
H₂CO₃(aq) wk. electrolyte and H₂O(l) driving force compound are not shown ionized in ionic equation. Only strong electrolytes that ionize 100%; i.e., salts and strong acids and bases.
Net Ionic Equation: shows only the reactive components without the spectator ions (nonreactive components), in this case, the Na⁺(aq) ions.
H₂CO₃(aq) + 2OH⁻(aq) => CO₃²⁻(aq) + 2H₂O(l)
Mg(OH)2 + 2 HBr à MgBr2 + 2 H2O
Answer the questions below based on the above reaction. Answer with the correct number of significant figures. Show your work! Each question is worth 8 points. 1 point for sig figs, 1 point for correct final unit, 3 points for correct final answer, 2 points for correct molar masses, and 1 point for dimensional analysis table.
1. How many grams of MgBr2 will be produced from 18.3 grams of HBr?
2. How many moles of H2O will be produced from 18.3 grams of HBr?
3. How many grams of Mg(OH)2 are needed to completely react with 18.3 grams of HBr?
Explanation:
The balanced equation of the reaction is given as;
Mg(OH)2 (s) + 2 HBr (aq) → MgBr2 (aq) + 2 H2O (l)
1. How many grams of MgBr2 will be produced from 18.3 grams of HBr?
From the reaction;
2 mol of HBr produces 1 mol of MgBr2
Converting to masses using;
Mass = Number of moles * Molar mass
Molar mass of HBr = 80.91 g/mol
Molar mass of MgBr2 = 184.113 g/mol
This means;
(2 * 80.91 = 161.82g) of HBr produces (1 * 184.113 = 184.113g) MgBr2
18.3g would produce x
161.82 = 184.113
18.3 = x
x = (184.113 * 18.3 ) / 161.82 = 20.8 g
2. How many moles of H2O will be produced from 18.3 grams of HBr?
Converting the mass to mol;
Number of moles = Mass / Molar mass = 18.3 / 80.91 = 0.226 mol
From the reaction;
2 mol of HBr produces 2 mol of H2O
0.226 mol would produce x
2 =2
0.226 = x
x = 0.226 * 2 / 2 = 0.226 mol
3. How many grams of Mg(OH)2 are needed to completely react with 18.3 grams of HBr?
From the reaction;
2 mol of HBr reacts with 1 mol of Mg(OH)2
18.3g of HBr = 0.226 mol
2 = 1
0.226 = x
x = 0.226 * 1 /2
x = 0.113 mol
Please help Me I really need it
A 7.50 liter sealed jar at 18 degrees C contains 0.125 moles of oxygen and 0,125 moles of nitrogen gas. What is the pressure in the container?
HELPPPP!!!
Which element has the greatest atomic size?
a) Francium
b) Hydrogen
c) Rubidium
d) Sodium
Answer:
A. Francium
Explanation:
I'm not for sure but I believe this is correct. Hope it helps:)
Please help me!! :DDDDD
Answer:
i think b
Explanation:
What type of reaction occurs when potassium iodide is combined with lead (II) nitrate?
A. single replacement
b. double replacement
c. synthesis
d. combustion
Answer:
double replacement occurs
How is the periodic table organised?
The periodic table brings order to information about the chemical elements. The chemical elements are arranged in order of increasing atomic number. The horizontal rows are called periods and the vertical columns are called groups. Elements in the same group have similar chemical properties.
Diamonds are one of the hardest materials known. Hardness is how resistant a material
is to being scratched by another material. If two samples of metal that appear identical
are scratched by a diamond, is that sufficient to determine that they are the same metal?
Why or why not?
Calculate the change in heat (Q) that occurs when 38.68grams of steam at 304°C cools to liquid water at 197°C. (cp = 4.184 J/g°C)
Answer:
Change in heat (Q) = -1.7316 x 10⁴
Explanation:
Given:
Mass m = 38.68 g
Change in temperature Δt = (197-304) = -107°C
Specific heat C = 4.184 J/g°C
Find:
Change in heat (Q)
Computation:
Change in heat (Q) = (C)(m)(Δt)
Change in heat (Q) = (4.184)(38.68)(-107)
Change in heat (Q) = -1.7316 x 10⁴
What happens to the sugar that plants make during photosynthesis?
문
F
It is recycled in the soil and through the roots so other consumers
can grow
It is released by the stoma in the leaves and made available to
other consumers
It is used for growth and maintenance of the plant and a small
amount is available to feed consumers.
None of the above
Answer:
glucose
Explanation:
plants use sunlight water and the gases in the air to make glucose which is aform of sugar
What is the molarity of a solution containing 29g of NaCl in 1L solution?
Answer:
hope this helps
Explanation:
1M NaCl solution is 58.5 g/1000 ml , where molecular wt of NaCl being 58.5 grams , so 29.2 g of NaCl in 1000 ml of water will be equal to : 29.2g /58.5g = 0.499145299 M , so 29.2 g NaCl dissolved in 100 ml would correspond to , 0.499145299 M X 1000 ml/100 ml = 4.99145 M or about 4.99 M
ASAP
The directions "shake well before using" are listed on special types of heterogeneous mixtures called
A- Solutions
B- Suspensions
I am currently learning this and I would say Suspensions!
Hope this helps :)
The chemical analysis of a compound gave the percentage composition by mass: Carbon 40%, Hydrogen 6.67% and Oxygen 53.3%. The relative formula mass of a compound is 180. What is the molecular formula of this compound?
Answer:
C6H12O6
Explanation:
I attached the method for solving above.
Number 2 plssssssssssssssssssssssssssssssss
Answer:
Its located on North America
Baking soda (sodium bicarbonate) is a compound commonly used in baked goods, as a deodorizer in refrigerators, and as an antacid. Commercial quantities of baking soda are produced by mixing soda ash dissolved in water with carbon dioxide. Baking soda precipitates as a solid from this method:
Na2CO3 + CO2 + H2O → 2NaHCO3
How many grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate?
Answer:631 g
Explanation: bc i did the math
630.581 grams of soda ash would be needed to produce 1,000 g of sodium bicarbonate.
How we calculate moles from grams?Moles can be related to the mass or weight of any substance as follow:
n = W/M, where
W = given mass
M = molar mass
Given balanced chemical equation for the formation of sodium bicarbonate is:
Na₂CO₃ + CO₂ + H₂O → 2NaHCO₃
From the stoichiometry of the reaction, it is clear that:
1 mole of Na₂CO₃ is required = to form 2 moles of NaHCO₃
Or 1/2 mole of Na₂CO₃ is required = to form 1 moles of NaHCO₃
Moles of NaHCO₃ be calculated by using the above formula as:
n = 1,000g (given) / 84.007g/mole = 11.90 moles
So, moles of Na₂CO₃ required to form 11.90 moles of NaHCO₃ = 11.90×1/2 = 5.95 moles
Now we convert the mole of Na₂CO₃ to grams by using the mole formula:
W = 5.95mole × 105.98g/mole = 630.581 grams.
Hence, 630.581 grams of soda ash would be needed.
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What is the answer?
Answer:
Option A
Explanation:
The atomic number is the number of protons in the nucleus of an atom.
Miscible liquids that have different boiling points can be separated by _______.
A.filtration
B.distillation
C.chromotagraphy
D.evaporation
Please help it's due soon
what type of ion do elements from each of the following groups form ,
group1
group 7.
Answer:
group 1 - cations charge +1
group 7 - anions charge -1
Explanation:
Group 1 has one valence electron and will lose one electron to complete the octet.
Group 7 has 7 valence electrons and will accept an electron to complete the octet.
Group 1 elements form cations while group 7 elements form anions as per their electronic configuration.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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When a solid suddenly appears when two substances are mixed, and it settles to the bottom, collects on another object, or makes a solution loudy, that solid is known as a _____. pls help ASAP!
Answer:
Precipitates Form
Explanation:
I apologize if I am wrong
W + BgCz2 --> WCz + Bg
Balance this equation
Answer: W + BgCz2 arrow WCz + Bg
2 W + BgCz2 arrow 2 WCz + Bg
Explanation:
Cz has 2 so you balcne the other side of WCz.
Since you Balcanes the Cz you changed the W and you Balcanes the other W on the left side.