The 12.5 g of NaCl is required to make 9.0% of the NaCl solution.
How the percentage is related to grams in terms of Chemistry?
Both percentages and grams both are units or parameters used to express the concentrations in chemistry.
Given:
The % of NaCl = 9.0% or = 9/10 = 0.9
The weight of the solution = 239 grams
The molar mass of the NaCl = 58.44 g/mol
Here, we use formula = 0.9 = (Mass of the solute*1000)/(Mass of the solvent)
Let us assume the mass of the solute = x = mass in the gram/ molecular mass of the solute.
Now, by using the above formula, we get
X= 0.9*239*58.44/1000
X = 12.5 grams
Hence, 12.5 grams is the answer
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A student in lab needs to make a solution that is 8.00% by mass NaCl. If 145 g of NaCl is available, what mass of solution can
be prepared?
According to the given statement 1812.5 g mass of solution can be prepared.
How is solution formed?When one substance dissolves, or separates into the other, a solution is created. A solute is the name for the material that dissolves to create a solution. A solvents is the material that a solution will dissolve in. Sugar is the solute while water is the solvent in a sugar syrup.
Briefing:8.0% by mass NaCl means 8 g NaCl in a total of 145 g solution. (note it is g of total solution)
Use dimensional analysis:
145 g NaCl x 100 g solution/8 g NaCl
= 1812.5 g solution
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A student poured a liter of liquid water into a jar and then placed a lid on the jar. Compare and contrast the liquid water and the water vapor in the jar to complete the table.
The liquids are less energetic than the gases. They have a definite volume unlike the gases but like the gases, they have no definite shape.
What are the states of matter?Matter is anything that has mass and occupy space. We know that matter is composed of particles. The particles that compose matter are known to differ in the way that they move about. All the particles of each of the states of matter do not have the same amount of energy. Some states of matter have particles that are more energetic than other particles of matter.
Let us note that the liquid state of matter is less energetic then the gaseous state of matter. This is because the particles that compose a gas are always moving at a very high speed. The particles that compose a liquid have lesser energy.
On the other hand, a gas has no definite volume or shape while a liquid does not have a definite shape but it has a definite volume.
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List all possible values of the magnetic quantum number ml for a 4p electron.
Answer:
-1, 0, 1
Explanation:
for n = 4
l = 0, 1, 2, 3
p corresponds to 1
so ml of 4p is -1, 0, 1
Calculate the number of grams that would be needed to make 2.50 x 10? mL of 0.754 M KOH. Enter your answer in the provided box.
The mass of a single barium atom is 2.28×10-22 grams. How many barium atoms would there be in 166 milligrams of barium?
166 milligrams is equal to 0.166 grams.
If 2.28x10^-22 grams is the mass of 1 atom, then 0.166 grams would constitute how many atoms?
The equation we would make is as follows:
2.28x10^-22/1 = 0.166/x
- If we cross multiply and solve for x, we get the answer which is 7.28x10^20 atoms.
If the moxie tank has an initial pressure of 50 atm in the winter what will be the pressure in summer
The pressure of the Moxie's tank in the summer will be 110.5 atm.
The correct option is C.
What is pressure law?According to the pressure law, if the volume remains constant, for a given mass of gas, the pressure applied to the container's sidewalls is directly proportional to the gas's absolute temperature.
Briefing:This law can be expressed mathematically as
P₁/T₁ = P₂/T₂
where
P₁ is the starting pressure.
The final pressure is P₂.
The starting temperature is T₁
The final temperature is T₂
The pressure of the gas increases as its temperature does.
As a result, since summertime temperatures are higher than wintertime temperatures, the pressure within the Moxie's tank will be higher than 50 atm throughout the summer.
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The complete question is -
If the Moxie's tank has an initial pressure of 50 atm in the winter, what will be point the pressure in the summer?
A. 5.88 atm
B. 22.6 atm
C. 110.5 atm
The charge on an electrically neutral atom of hydrogen is __.
A +1
B 0
C -1
Answer:
B. 0
Explanation:
The charge on any electrically neutral atom is alway zero.
A chemistry student needs 65.0 g of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is 1.10 g-cm^- 3. Calculate the volume of pentane the student should pour out. Be sure your answer has the correct number of significant digits.
The volume of the pentane the student should pour out, given that he needed 65.0 g of it is 59 cm³
How to determine the volumeFrom the definition of density, we can obtain an expression to calculate volume. This is illustrated below:
Density = mass / volume
Cross multiply
Density × volume = mass
Divide both sides by density
Volume = mass / density
With the above formula, we can obtain the volume of the pentane as follow:
Mass of pentane = 65 gramsDensity of pentane = 1.10 g/cm³ Volume of pentane = ?Volume = mass / density
Volume = 65 / 1.10
Volume = 59 cm³
Thus, the volume of the pentane is 59 cm³
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What volume of sodium hydroxide (0.167 M) is needed to titrate 18.53 mL of perchloric acid (HClO4 (aq)) with molarity of 0.242 M ? Answer in mL with one decimal place- you do not need to include units in your response.
The volume (in mL) of the 0.167 M sodium hydroxide, NaOH solution needed is 26.9 mL
How to determine the volume of NaOHThe balanced equation for the reaction is given below:
HClO₄ + NaOH —> NaClO₄ + H₂O
The mole of the acid, HClO₄ (nA) = 1The mole of the base, NaOH (nB) = 1The volume of NaOH can be obtained as follow:
Molarity of base, NaOH (Mb) = 0.167 MVolume of acid, HClO₄ (Va) = 18.53 mL Molarity of acid, HClO₄ (Ma) = 0.242 MVolume of base, NaOH (Vb) =?MaVa / MbVb = nA / nB
(0.242 × 18.53) / (0.167 × Vb) = 1
4.48426 / (0.167 × Vb) = 1
Cross multiply
0.167 × Vb = 4.48426
Divide both side by 0.167
Vb = 4.48426 / 0.167
Vb = 26.9 mL
Thus, the volume of the NaOH solution needed is 26.9 mL
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For the reaction of calcium chloride and sodium oxalate, write: a chemical equation that represents the reaction including all appropriate phase labels (e.g. (s), (l), (aq)).
The chemical equation that represents the reaction is NaCl(s) ⇒Na+(aq) + Cl-(aq).
A mixture of sodium sulfate and calcium chloride produces four crystals sodium sulfate calcium chloride sodium chloride and calcium sulfate. Calcium chloride dissolved in water dissociates into ions according to the formula This is an example of a precipitation reaction. This occurs when two aqueous solutions combine to form a precipitate and by-products. It is also usually water-based.
A balanced equation is an equation of a chemical reaction in which the number of atoms and the total charge of each element in the reaction is the same for both reactants and products. In other words, mass and charge are balanced on both sides of the reaction. Widely used as an acid laundry detergent, oxalic acid effectively removes rust and ink stains because it converts most insoluble iron compounds to soluble complex ions.
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Write and balance the equation for the decomposition of aluminum chloride into its elements. phase symbols are optional.
Balance the equation for the decomposition of aluminum chloride into its elements is 2AlCl₃ → 2Al + 3Cl₂
Decomposition reactions are processes in which chemical species break up into simpler parts and here given compound is aluminum chloride is hexahydrate is thermally decomposed to alumina by sequential treatment in two dense fluidized bed decomposers the first decomposer being operated at a temperature of about 200° to 400° C and the second at a temperature of about 900° to 1100° C
Here we have to write and balance the equation for the decomposition of aluminum chloride into its elements so balanced equation for aluminum chloride for decomposition is
2AlCl₃ → 2Al + 3Cl₂
2 mole of AlCl₃ gives 2 mole of Al and 3 mole of Cl₂
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Alkaline earth metals are found in group 2 and tend to ____ 2 electrons when combined with another element.
Alkaline earth metals are found in group 2 and tend to donate 2 electrons when combined with another element.
What is alkali metal?Alkali metal are those have one electron in their valence shell.It generally found in group 1 in the modern periodic table.Elements in this group involves hydrogen, lithium, sodium, potassium, rubedium, cesium, francium.These type of metal when react with another metal gives one electron in order to make their valence shell free and become stable.That's why their valency is +1.
Now,
What is alkaline earth metal?Alkaline earth metal are those have two electron in their valence shell.It generally found in group 2 in the modern periodic table.Elements in this group involves Beryllium, magnesium, calcium, strontium, barium , radium. These type of metal when react with another metal gives two electron in order to make their valence shell free and become stable.That's why their valency is +2.Now,
As per the given question,
Alkaline earth metals are found in group 2 and tend to donate 2 electrons when combined with another element.
Thus, from the above conclusion we can say that , alkaline earth metals are found in group 2 and tend to donate 2 electrons when combined with another element.
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How many grams of Br are in 115 g CaBr₂?
Answer: 95.7 g Br
Explanation: Molecular weight of Ca = 40.78
Molecular weight of Br is 79.9.
Molecular weight of CaBr2 is 192g/mol
115g CaBr2 x 1 mol CaBr/192g = 0.6 x 2 mol Br/1mol CaBr2 = 1.2 mol Br
1.2 mol Br x 79.9g Br/mol Br = 95.7g Br
"What volume of 0.642 M [Molar ]magnesium Chloride (MgCl2, MM 95.21 g/mol) solution would be required to deliver 4.50g of MgCl2?"
Explanation:
n=m/MM
MM of MgCl2=95.2
n=4.5/95.211
M=n/V
0.652=0.0473/V
V=0.0724 L
=72 ml
1. How many grams would 3.07 moles of FeCl3 be?
Answer:
497.97 g
Explanation:
Fe weights 55.845 g
Cl weights 35.453g
1 mole FeCl3 = 55.845 + 3(35.453) = 162.204 g
=> 3.07 moles = 3.07(162.204) = 497.96628 or 497.97 g
. What volume of a 15.2 M H3PO4 solution (in mL) do you need to make the following solutions?
a. 3.50 L of a 0.750 M H3PO4 solution
b. 12.5 L of a 0.155 M H3PO4 solution
C.
475 mL of a 1.20 M H3PO4 solution
15.2 M H3PO4 solution (in mL) do you need to make 475 mL of a 1.20 M H3PO4 solution
an H3PO4 solution be created
As a result, you must combine 0.9316 liters (931.6 ml) of water with 0.0684 liters (68.4 ml) of concentrated solution to create 1 liter of 1 M. Solution of phosphoric acid
How can I figure out what a solution's concentration is?
Subtract the solute's mass from the solution's overall volume. C = m/V, where m is the solute's mass and V is the entire volume of the solution, should be written down. To calculate the concentration of your solution, divide the mass and volume quantities you discovered by the corresponding plug-in values.
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an example of a element would be A. Chlorine gas B. salt C. tap water D. vegetable soup
An example of a element would be chlorine gas
An element is a substance whose atoms all have the same number of protons another way of saying this is that all atoms of a given element have the same number of protons and elements are the simplest chemical forms and thus can not be broken down through chemical reactions and chlorine is a yellow-green gas at room temperature and chlorine has a pungent, irritating odor similar to bleach that is detectable at low concentrations and the density of chlorine gas is approximately 2.5 times greater than air and in the given option only chlorine gas is the element
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