How many mg are in 0.750 moles of zinc?
Answers
Answer:
To find the number of milligrams (mg) in 0.750 moles of zinc, you will need to know the atomic weight of zinc. The atomic weight of zinc is 65.38 g/mol.
To convert from moles to milligrams, you will need to multiply the number of moles by the atomic weight of zinc and then multiply by 1000 to convert the weight to milligrams.
Thus, the number of milligrams in 0.750 moles of zinc is:
0.750 moles * 65.38 g/mol * 1000 mg/g = 48.7850 mg
So there are approximately 48.79 mg of zinc in 0.750 moles of the element.
Explanation:
Related Questions
*
When Gallium becomes an ion it loses 3 electrons to become:
A: -3
B: +3
C: It loses 3 electrons to become a neutral atom
D: It is already neutral
Answers
Answer:
B: +3
Explanation:
If Gallium loses 3 electrons, it will become an ion.
The ion will be positively charged because in this new ion, the number of electrons is lesser than the number of protons. The charge difference will impart a positive net charge on the ion.
In a neutral atom, the number of electrons and protons are the same. For positively charged ions, the number of protons is greater than the electronsIf Gallium the loss of 3 electrons offsets the charge balance in the chemical specie. Thus, the ion will have a net +3 charge.
could freezing point depression be used for dubstances not soluble in water
Answers
If a substance is not soluble in water, then it cannot be used for freezing point depression.
Freezing point depression is a phenomenon in which the freezing point of a liquid is lowered by adding a solute to it. This happens because the solute molecules interfere with the crystal formation of the solvent, preventing it from solidifying at its usual temperature. Freezing point depression can be used to determine the molecular weight of a solute in a solvent or to separate components of a mixture by crystallization. However, the solute must be soluble in the solvent for this technique to be effective.
This is because the solute molecules must be uniformly distributed throughout the solvent to lower the freezing point. If the solute is insoluble, it will not dissolve in the solvent and cannot exert an effect on its freezing point.
In summary, freezing point depression can only be used for substances that are soluble in the solvent. It is a useful technique in determining molecular weight or separating components of a mixture, but its effectiveness is limited by the solubility of the solute.
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consider the liquid phase reaction the equilibrium constant is 0.09 find the equilibrium convserion
Answers
the equilibrium conversion for the liquid phase reaction is 0.086 or 8.6%.
In a liquid phase reaction, the equilibrium constant is a measure of the ratio of the concentrations of the products and reactants at equilibrium. The equilibrium constant for the given reaction is 0.09. To find the equilibrium conversion, we need to determine the ratio of the concentrations of the products and reactants at equilibrium.
Let's assume that the reactant concentration at equilibrium is 1 mole. If x moles of the reactant are converted to products, then the equilibrium concentrations of the reactant and products are (1-x) and x, respectively. Using the equilibrium constant expression, we can write:
Kc = [products]/[reactants]
0.09 = x/(1-x)
Solving this equation for x, we get:
x = 0.086
This means that at equilibrium, 8.6% of the reactant is converted to products and the rest (91.4%) remains as the reactant.
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How many molecules of hydrogen are required to react with 65 molecules of nitrogen?
Answers
Explanation:
Refer to pic...........
Need help please!! Don’t understand
Answers
Answer:
okay in this question what your supposed to do is firm sentences ...... explain what happens
Explanation:
1... hydrogen reacts with bromine to form hydrogen bromide
2 ...Nitrogen gas reacts with hydrogen gas to form ammonia gas
4....Copper nitrate it's aqueous in nature is heated and there for forms copper oxide,,, nitrogen iv oxide and oxygen gas
Starting substances
Substance 1
?
Substance 2
+ ?
Jamie works at a company that makes cleaning chemicals. She is trying to make a chemical that smells like flowers. She took two
samples that were gases at room temperature and mixed them in a sealed container.
The diagram above shows the repeating groups of atoms that make up the two starting substances.
After mixing, Jamie found two substances that smelled like flowers in the sealed container. (Nothing had escaped.)
Which of the diagrams shows the repeating groups of atoms that make up the ending substances?
Answers
The combination of the compounds can be found in option C
How is a compound formed?
A compound is formed through a chemical reaction or a combination of elements. In a chemical reaction, two or more elements combine or react with each other to form a compound.
The elements involved in the reaction undergo a rearrangement of their atoms and bonding to form new chemical bonds, resulting in the formation of a compound with different properties from the original elements. This is clear from the images that have been shown in the question.
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1. What force binds galaxies together?
Answers
Answer:
Gravity.
Explanation:
Black holes in the center of most galaxies hold the galaxy together by gravity. Everything is sucked towards the center and kept together.
Answer:
Gravity
Explanation:
The same force that holds you onto the Earth can keep many individual galaxies bound together.
10.
Potash is a common name for potassium carbonate. Originally, potash was obtained by
adding water to the ash produced from the burning of wood, filtering and evaporating the
filtrate.
(a)
Meirion was asked to find the percentage of potash that could be obtained from some
wood ash. He added water to a known mass of wood ash, stirred the mixture and then
filtered the product. The filtrate was then made up to a volume of 250 cm³.
(i) State why the mixture was stirred.
[1]
E
(ii) Describe, giving full practical details, how the volume was made up to exactly
[4]
250 cm³.
Answers
Answer:
(a) (i) The mixture was stirred to ensure that the wood ash was completely mixed with the water, allowing for the maximum amount of potash to be dissolved and filtered out of the ash.
(ii) To make the volume up to exactly 250 cm³, Meirion can use a graduated cylinder or a measuring cylinder to measure the volume of the filtrate. He can then add distilled water to the filtrate until the total volume reaches 250 cm³. He can use a dropper or a pipette to add small amounts of water and stir the mixture until the desired volume is reached. He can also measure the volume with a graduated cylinder or a measuring cylinder. Finally, he can check the final volume of the solution again to make sure that the volume is exactly 250 cm³.
how many ml of ethyl alcohol are required to make a 5.64% (v/v) aqueous solution in a 100. ml volumetric flask?
Answers
It takes 1773.0 mL of ethyl alcohol solution to generate a 100 ml of 5.64% (v/v) aqueous solution.
What is an ethyl alcohol used for?Beer, wine, and spirits all contain methanol when they are diluted. It is a topical ingredient used in pharmaceutical formulations (such as rubbing compounds, creams, tonics, and colognes), perfumes, and scents to combat skin infections.
Briefing:Volume-by-volume % concentration of a solution,
How many milliliters of solute are present in 100 mL of solution is expressed as 5.64% v/v.
In this instance.
The 5.64% v/v solution will include:
For every 100 mL of solution, there is 5.64 mL of solute.
Therefore, you must have the ethyl alcohol needed to create a 5.64% (v/v) aqueous solution in 100 ml of solute.
100 mL of solution * 100 mL of solute/ 5.64mL of solute
=1773.04 mL of liquid.
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Dãy các chất tác dụng với nước ở nhiệt độ thường là
A. SO2, BaO, Mg.
B. Na2O, P2O5, K.
C. SO3, BaO, Fe.
D. CaO, BaO, Fe
Answers
Write the correct abbreviation for each metric unit.
1) Kilogram __ 4) Milliliter __ 7) Kilometer __ 2) Meter 5) Millimeter __
8) Centimeter __ 3) Gram __ 6) Liter __ 9) Milligram __
Answers
The correct abbreviation for each metric unit is:
Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g, Liter - L, and Milligram - mg.
What is the metric system?The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter. Each of the fundamental dimensions can be expressed by a single base unit of measure.
For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.
Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.
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Which of the apparatus diagrams shows the correct set-up of equipment for evaporation? Give your answer A,B, C or D.
Answers
Answer:
a
Explanation:
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HELP ME PLS I NEED HELP
How many atoms are in 9.35 moles of lithium?
Select one:
O a. 5.63 x 1024 atoms
O b.5.63 x 1023 atoms
O c.6.02 x 1023 atoms
O d. 1.55 x 10-23 atoms
Answers
The number of atoms in 9.35 moles of lithium is 5.63×10²⁴ atoms
The correct answer to the question is Option A. 5.63×10²⁴ atoms
From Avogadro's hypothesis,
1 mole of Li = 6.02×10²³ atoms
With the above information in mind, we can obtain the number of atoms in 9.35 moles of lithium. This can be obtained as follow:
From Avogadro's hypothesis,
1 mole of Li = 6.02×10²³ atoms
Therefore,
9.35 moles of Li = 9.35 × 6.02×10²³
9.35 moles of Li = 5.63×10²⁴ atoms
Therefore, the number of atoms in 9.35 moles of lithium is 5.63×10²⁴ atoms
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Answer:
5.63x10^24 Atoms
Explanation:
How does an objects velocity affect its interia?
Answers
The more inertia an object has (which is measured by the mass of an object), the harder it is (the more force it takes) to change its velocity
Which are three ways water reaches the atmosphere?
A. sublimation, condensation, transpiration
B. evaporation, radiation, and condensation
C. transpiration, evaporation, and sublimation
Answers
Answer:
C. Transpiration, evaporation, and sublimation.
Explanation:
thank you to the internet.
Consider the molecule below. Determine the hybridization at each of the 2 labeled carbons.
Answers
Answer: C1: sp^2; C2: sp^3
Explanation:
Carbon 1 is sp2 hybridized while Carbon 2 is sp3 hybridized.
Atoms that contain single bonds are sp3 hybridized while atoms that contain double bonds are sp2 hybridized.
The term hybridization as introduced by Linus Pauling is used to explain the idea of mixing atomic orbitals of appropriate energy to obtain hybrid orbitals that are suitable for chemical bonding.
Carbon atoms may be;
sp3 hybridized (single bonds)sp2 hybridized (double bonds)sp hybridized (triple bonds)In this case, carbon 1 is doubly bonded hence it is sp2 hybridized. Carbon 2 is singly bonded hence it is sp3 hybridized.
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2-2. (10 points) At the bottom of a flat, quiescent (i.e., no advection) lake there are solid deposits of manganese. Due to a change in redox conditions manganese is dissolving into the water and just above the manganese deposits the concentration is 60μg/L. The lake serves as a water source for the water treatment plant that does not currently have manganese treatment. The water system's goal is for manganese to remain below its detection limit of 2μg/L because manganese accumulation in the distribution system can lead to black water events. a) What is the dominate transport mechanism in the lake? b) The intake at the water treatment plant is 1ft from the lake bottom. How long does the water treatment plant have before it needs to start treating for manganese? Use equation 1−18 in Benjamin and Lawler that is provided for stagnant conditions. The diffusion coefficient for manganese is 6.88×10−6 cm2/s. c) As a temporary solution the water treatment plant plans to raise the water intake level so that it has 1 year to design and install a manganese treatment system. What minimum height above the lake bottom should the intake be raised?
Answers
The dominant transport mechanism in the lake is diffusion. The water treatment plant has a limited time before it needs to start treating for manganese, and the minimum height above the lake bottom for the water intake to provide one year for designing and installing a manganese treatment system needs to be determined.
Dominant transport mechanism: Diffusion is the main transport mechanism in the lake. This means that manganese is gradually diffusing from the solid deposits at the lake bottom into the water column.
Initial concentration: The concentration of manganese just above the deposits is given as 60 μg/L.Detection limit: The water treatment plant aims to keep the manganese concentration below the detection limit of 2 μg/L to prevent black water events.Time to start treating: To determine how long the water treatment plant has before it needs to start treating for manganese, we can use Equation 1-18 in Benjamin and Lawler, which is provided for stagnant conditions. The equation is:t = (L^2) / (4D)
where t is the time in seconds, L is the distance from the bottom (1 ft or 30.48 cm), and D is the diffusion coefficient of manganese (6.88×10^(-6) cm^2/s).
Calculation Plugging in the values into the equation, we can calculate the time it takes for manganese to reach the water intake level.
t = (30.48^2) / (4 × 6.88×10^(-6)) = 126,707 seconds
Converting seconds to days: 126,707 seconds ÷ (24 hours/day × 3600 seconds/hour) ≈ 1.47 days
Therefore, the water treatment plant has approximately 1.47 days before it needs to start treating for manganese.
Minimum intake height: To provide one year for designing and installing a manganese treatment system, the intake should be raised to a height where the time it takes for manganese to reach that level is one year.
t = (L^2) / (4D)
Rearranging the equation to solve for L:
L = √(4Dt)
Plugging in the values: L = √(4 × 6.88×10^(-6) cm^2/s × (1 year × 365 days/year × 24 hours/day × 3600 seconds/hour))
L ≈ 49.65 cm or 0.163 ft
The minimum height above the lake bottom that the intake should be raised to is approximately 0.163 ft.
The dominant transport mechanism in the lake is diffusion, where manganese is slowly diffusing from the solid deposits into the water column. The water treatment plant has approximately 1.47 days before it needs to start treating for manganese to maintain concentrations below the detection limit. To provide one year for designing and installing a treatment system, the intake should be raised to a minimum height of approximately 0.163 ft above the lake bottom.
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An investigation found that more bushels of potatoes were produced when the soil had more fertilizer. What is the Independent variable, Dependent variable, and 3 constants?
Answers
Independent variable: fertilizer
Dependent variable: bushels of potatoes
3 constants: soil, climate, and time of planting.
Experimental variablesExperimental variables can be:
IndependentDependentConstantIndependent variables are supplied directly by the experimenter and are often manipulated to produce different outcomes.
Dependent variables are the actual variables measured during experiments. Their values are dependent on the independent variable supplied.
Constant variables are all other variables that are neither independent nor dependent but are supplied by the experimenter.
Thus, in this case, the independent variable will be the quantity of fertilizer added to the soil, and the dependent variable will be the bushels of potatoes produced by each experimental group.
The constant variables may include the soil type, climatic conditions, time of planting, etc. All these must be kept constant for the different experimental groups.
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of the halogen family, fluorine, chlorine, bromine, and iodine, which would you expect not to produce a positive beilstein test result?
Answers
The Beilstein test is a test for halogens, which identifies the presence of halogens in an organic compound. The test is based on the observation that halogen atoms produce a green flame when a compound containing halogens is introduced into a flame.
Of the halogens in the halogen family (fluorine, chlorine, bromine, and iodine), fluorine is the halogen that would not produce a positive Beilstein test result. This is because fluorine is so reactive that it will react with the copper wire used in the test, preventing the green flame from being produced. In contrast, chlorine, bromine, and iodine will react with the copper wire to produce a green flame, indicating the presence of halogens in the compound being tested.
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what is the total number of atoms in calcium phosphate, ca3(po4)2?
Answers
There are a total of 5 atoms in calcium phosphate, \(Ca_3(PO_4)_2.\)
The total number of atoms in calcium phosphate, \(Ca_3(PO_4)_2.\), can be calculated by adding up the number of atoms of each element in the compound.
Calcium (Ca) has the atomic number 20, and phosphorus (P) has the atomic number 15. The formula for calcium phosphate is \(Ca_3(PO_4)_2.\)which indicates that there are three calcium atoms and two phosphorus atoms in the compound.
To find the total number of atoms in calcium phosphate, we can use the following calculation:
Atoms of Ca: 3
Atoms of P: 2
Total atoms: 3 + 2 = 5
Therefore, there are a total of 5 atoms in calcium phosphate, \(Ca_3(PO_4)_2.\)
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How many spaces have been left for the possible discovery of new elements?
Answers
this is the answer to ur question hope is helpful
What is the pH of the solution if the molarity is 0.065M[H+]
Answers
The pH of a solution that has a hydrogen ion concentration [H+] of molarity 0.065M is 1.19.
How to calculate pH?The pH of a solution refers to the power of hydrogen in the solution i.e. the degree of acidity or alkalinity of the solution.
The pH of a solution with known concentration can be calculated using the following formula:
pH = - log [H+]
According to this question, a solution has a molarity of 0.065M. The pH is as follows:
pH = - log [0.065]
pH = 1.19
Therefore, the pH of a solution that has a hydrogen ion concentration [H+] of molarity 0.065M is 1.19.
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Which of the following statements about the elements in group 2 of the periodic table is true?
They all tend to become positive ions when they bond with other elements.
They all have similar chemical and physical properties.
They all have two electrons in their outermost shell.
They are all metals.
Answers
Answer:
they all have two electrons in their outermost shell
The elements of group 2 are alkaline earth metals that have two electrons in their outermost shell. So they have similar chemical and physical properties and tend to become positive ions in bond formation.
What are the properties of the elements of group 2?The elements present in group 2 include Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.
The elements of group 2 are similar in their physical and chemical properties as all the elements have the same number of valence electrons. All alkaline earth metals are silvery-white-colored solids under normal conditions. They are also shiny and quite reactive.
The general electronic configuration of group 2 elements is ns². The alkaline earth metals have fully filled s-orbital in their valence shells, they tend to lose two electrons to produce cations with +2 charge.
Therefore, the elements of group 2 are electropositive in nature. Therefore, all the given statements about group 2 of the periodic table are true.
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Please help there is a picture below.
Answers
Answer:
A is its answer
Explanation:
Fan uses electrical energy and makes it to mechanical energy by rotating
Same is with the drill
Trampoline does not use electrical energy
Lamp uses electrical energy but it converts it into light energy and heat energy
So A is the answer
safety: when heating a flammable or volatile solvent for a recrystallization, which of these statements are correct? more than one answer may be correct.
Answers
You shouldn't utilize an open fire to warm the dissolvable.You should make sure that no one else is working near your experiment with an open flame are correct.
Option 1 and 3 are correct.
A chemical compound is purified through recrystallization. The impure compound should be added to a suitable solvent during this procedure, and the solvent should then be heated to dissolve the compound. The crystals of the relatively pure compound are then obtained by cooling the solution in an ice bath.
Recrystallization employs volatile solvents—or solvents with a low boiling point—to facilitate solvent evaporation.
Combustible or unpredictable dissolvable ought not be warmed utilizing an open fire and no open fire ought to be utilized in the environmental elements as the dissolvable fumes can undoubtedly burst into flames.
The solvent should not be heated in a stoppered flask for recrystallization. As a result, the second statement is false.
Incomplete question:
When heating a flammable or volatile solvent for a recrystallization, which of these statements are correct? More than one answer may be correct.
1)You should not use an open flame to heat the solvent.
2)You should heat the solvent in a stoppered flask to keep vapor away from any open flames.
3)You should ensure that no one else is using an open flame near your experiment.
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Please help I’ll give you guys brainiest!
Thank youuuuuuu :))
Answers
Answer:
I think it's unbalanced
(I'm so sorry if it's wrong)
Hope this helps!
Answer:
unbalanced
Explanation:
Write the orbital notation for carbon, atomic number 6
Answers
Answer:
Carbon has 6 protons and electrons, so it has 2 in the 1S orbital, 2 in the 2S orbital, and 2 in the 1P orbital.
Explanation:
The photo shows nervous tissue.
What is the main function of nervous tissue?
o
A. To transport materials and defend the body
B. To cover the body to protect other cells
C. To send signals to control the body
D. To contract to cause movement in the body
Answers
Answer:
The answer is c( to send signals to control the body)
Answer:
c. To send signals to control the body.
Explanation:
. It is responsible for coordinating and controlling many body activities. It stimulates muscle contraction, creates an awareness of the environment, and plays a major role in emotions, memory, and reasoning..
Write formulas and other symbols for these substances.
a. Sulfur trioxide (SO3) gas
b. Potassium nitrate (KNO3) dissolved in water
c. Heat supplied to a chemical reaction
d. Metallic copper
e. Liquid mercury
f. Zinc chloride (ZnCl2) as a catalyst
Answers
The chemical formula of mentioned substances is as follows 1) SO₃ 2) K\(^+\) and NO₃\(^-\) 3) ΔH 4) Cu 5) Hg (l) 6)ZnCl₂.
What is chemical formula?Chemical formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols of elements. It also makes use of brackets and subscripts.
Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form is called empirical formula.
It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.
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What is the hydrogen ion concentration of a solution with ph = 2. 25?.