Answer:
The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12.
What is the coefficient for O2SF2 once the reaction is balanced
Answer:
3
Explanation:
Important concept! The little number after an element represents the number of atoms in the substance. Eg. SF6. The 6 after the F tell us that there are 6 atoms of Fluorine in SF6. The coefficient or big number before a substance tells us how many of that substance there is in the equation. TO find the number of atoms in a substance with a coefficient we simply multiply the coefficient by the subscript or small number. Eg. 4SF6. The number of fluorine atoms in 4SF6 can be found my multiplying 4 and 6. 4 * 6 = 24 so there are 24 atoms of fluorine in 4SF6
Balancing the equation!
First lets list the number of atoms of each element on each side so we can see what we need to balance
SF6 + SO3 --> O2SF2
2 S 1
6 F 2
3 O 2
First lets balance the number of oxygen atoms. We can do this by adding a coefficient of 2 to SO3 and a 3 to O2SF2. After doing so lets count the number of atoms of each element again as some of them may have changed.
SF6 + 2SO3 --> 3O2SF2
3 S 3
6 F 6
6 O 6
It appears that the each element in the reaction is now balanced after adding a 2 to SO3 and a 3 to O2SF2 so the equation is now balanced.
The answer would be 3 as 3 was added to O2SF2 to balance the reaction.
"A certain group one metal combines with Hydrogen, to form a molecule with the formula XH. The equilibrium bond length of this compound is 1.5957 Å. If this molecule exhibits a pure rotational spectrum with a rotational constant of 7.5131cm−1, calculate the molecular weight of metal X."
I thought that you would use a mix of the reduced mass and rotational constant formulas to get:
[tex]1.66e-27(\frac{(m1)(m2)}{m1+m2})=\frac{h/2\pi}{4\pi Bcr^{2} }[/tex]
However, that just gives a negative answer, and mass cannot be negative. I am confused and would appreciate any help
Based on the bond length, the molecular weight of the unknown metal X is 23.
What are ionic compounds?Ionic compounds are compounds which are formed between oppositely charged ions.
When hydrogen combines with the group 1 metals, they form ionic compounds.
The group one metals that combine with hydrogen to firm ionic bonds include:
Lithium to give Lithium hydride with equilibrium bond length of 0.239Å. Sodium to give sodium hydride with equilibrium bond length of 1.896Å.Potassium to give potassium hydride with equilibrium bond length of 2.321ÅThe molecular weight of lithium is 7 g
The molecularweight of sodium is 23
The molecular weight of Potassium is 39.
Therefore, based on the equilibrium bond length, the molecular weight of the unknown metal X is 23.
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Determine the pH of 1 x 10^-2 NaOH.
a. 2.0
b. 4.0
c. 8.0
d. 12.0
Answer:
i think the answer is 12.0
Which are the functions of the skin? Check all that apply.
helps control body temperature
moves parts of the body
serves as a barrier of protection
releases waste materials
produces vitamin A
gives the body support and shape
Answer:
A,C,D
Explanation:
I TOOK THE TEST
(b) What will be the change in pH of the buffer of 7 if 5 mL of 5 N NaOH is added
to 1000 mL of the buffer?
List the following alcohols in the order of increasing boiling points (BP). A)
glycerol, B) ethylene glycol, C) n-hexyl alcohol, D) n-propyl alcohol, E)
isopropyl alcohol, F) n-butyl alcohol (Hint: You don't need to look up the BP
values, since the order can be predicted from the structures.)
*
A. ABDEFC
B. BADEFC
C. DEFCBA
D. ABCFED
E. EDFCBA
Answer:
A.
Explanation:
because it is the only logical answer
How many moles are in 59.6 grams of BaSO4
Answer:
0.2553669915026199 BaSO4
Explanation:
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Why was there a large increase in the human population after the Industrial Revolution?
Question 1 options:
advancements in science
improvements in nutrition
advancements in medicine
all of the above
Answer: improvements in nutrition
Explanation:
Answer:Look at the graph above. Human population increased dramatically at certain times. The graph begins 10,000 BC, although you can't really see the line. Population starts to rise perceptibly at around 1800 BC. The numbers begin to rise dramatically about 200 years ago. What causes these changes
Explanation:
Is it as critical for your tap water to be a good buffer as it is for the water at the
nearest lake to be a good buffer? Why or why not?
Yes, it is critical for your tap water to be a good buffer as it is for the water at the nearest lake to be a good buffer.
Why the tap water and lake should be good buffer?This is because the tap water is the water coming from the nearest lake so it should also be a good buffer just like the nearest lake so we can conclude that it is critical for your tap water to be a good buffer as it is for the water at the nearest lake to be a good buffer.
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Please help!
How many grams of H_{2}*O can be produced from the reaction of 100. g of C_{3}*H_{8}
Answer: 163.6g H2O
Explanation:
The balanced chemical equation for the combustion of propane is:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
This means 1 molecule of C3H8 react with 5 molecules of O2 to produce 3 molecules of CO2 and 4 molecules of H2O.
Molar mass C3H8 = 44 g/mol
According to the stochiometric coefficients 1 mol C3H8 will form 4H2O
100g C3H8 to mol = 100 g / 44 g/mol = 2.273 mol
This will produce 2.273*4 H2O = 9.09 mol H2O
Molar mass H2O = 18 g/mol
Mass of 9.09 mol H2O = 9.09 mol * 18 g/mol = 163.6 g H2O
Therefore, 163.6g of H2O will be formed from the combustion of 100g of C3H8
4. How many grams of water are produced from 100 grams of oxygen?
Answer:
11 grams of hydrogen and 89 grams of oxygen
Explanation:
Liquid octane CH3CH26CH3 reacts with gaseous oxygen gas O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. If 78.8g of carbon dioxide is produced from the reaction of 83.39g of octane and 122.6g of oxygen gas, calculate the percent yield of carbon dioxide.
Answer:
get it back to me by tomorrow
Explanation:
I am currently in life generally but will be perfect
every early childhood education program should develop a
A. plan for children and adults to eat separately
B. method to overcome food intolerance
C. procedure that allows families to bring in homemade food
D. written nutrition , feeding, and food service plan
Answer:
I guess D ...,...,.....
As shown in the following reaction, 50.0 grams of Magnesium (Mg) and 75.0 grams of (HCl) are reacted:
Mg + 2 HCl -----------> MgCl2 + H2
What is the limiting reactant?
Answer:
mg
Explanation:
there are 2.05 moles mg and 2.05 moles hcl
MM Mg = 24 g/mol
MM HCl = 36.5 g/mol
mol Mg = 50 : 24 = 2.083
mol HCl = 75 : 36.5 = 2.055
moles of reaction: divide the moles of each reactant by its corresponding coefficient in the balanced equation.
Mg : HCl = 2.083/1 : 2.055/2 = 2.083 : 1.028
HCl is the limiting reactant because it gives the fewest moles of reaction.
5) What type of energy does an x-ray give off?
A) Radiant B) Mechanical C) Electrical
D) Chemical
4 Al (s) + 302(8)
-
2Al2O3(s)
How many grams of Al2O3 can be formed from 77.58 g of Al and 33.92 g of O2?
(Hint: You need to determine which one is the limiting reactant).
Explanation 2Al2O3(s)-->4Al(s)+302(g)What is the total number of moles of O2 that are produced when 8.0 mol of Al2O3(s)are totally decomposed ?
When an ACID ionizes in water, the number of hydronium ions in the solution _____ and the value of the pH _?
decreases; increases
decreases; decreases
remains the same; cannot be predicted
increases; decreases
increases; increases
What is technology?
the process of designing and making tools
any device that contains electronic parts
the use of knowledge to solve practical problems
the study of the natural world
90 points
Answer:
Any device that contains electronic parts
PLEASE HELP!
If 0.00516 mols of HC2H302 are reacted with 0.00585 mols of NaHCO3, which is the limiting reactant?
Show your work.
NaHCO3(s) + HC2H302(aq) → C2H302Na(aq) +H2CO3(aq) H2CO3(aq) - H2O(1) +CO2(g)
Look at the reaction
More than 1mol of HC2H3O2 is required so the mols will be doubled atleast
0.00516(2)=0.01032molNow
NaHCO_3 is less
So Sodium bicarbonate is the limiting reagentIn the given query, the limiting reagent in provided chemical reaction is: [tex]\rm NaHCO_3(s) + HC_2H_3O_2(aq) \rightarrow C_2H_3O_2Na(aq) +H_2CO_3(aq)+ H_2O(l) +CO_2(g)[/tex] is [tex]\rm HC_2H_3O_2[/tex].
In a reaction, limiting reagent is a chemical substance that is completed used or is totally consumed resulting into limiting the formation of further products.
In the provided reaction:
[tex]\rm NaHCO_3(s) + HC_2H_3O_2(aq) \rightarrow C_2H_3O_2Na(aq) +H_2CO_3(aq)+ H_2O(l) +CO_2(g)[/tex]
Given: 0.00516 mol [tex]\rm HC_2H_3O_2[/tex] and 0.00585 mol [tex]\rm NaHCO_3[/tex].
Using balanced equation, the stoichiometric ratio of [tex]\rm HC_2H_3O_2[/tex] to [tex]\rm NaHCO_3[/tex] is 1:1. Meaning that, for every 1 mole of [tex]\rm HC_2H_3O_2[/tex], we need 1 mole of [tex]\rm NaHCO_3[/tex].
Therefore, the number of moles of [tex]\rm NaHCO_3[/tex] needed to react with 0.00516 mol of [tex]\rm HC_2H_3O_2[/tex] is:
0.00516 mol [tex]\rm HC_2H_3O_2[/tex] × (1 mol [tex]\rm NaHCO_3[/tex]/ 1 mol [tex]\rm HC_2H_3O_2[/tex])
= 0.00516 mol [tex]\rm NaHCO_3[/tex].
Since we have 0.00585 mol of [tex]\rm NaHCO_3[/tex], which is greater than the amount needed (0.00516 mol), [tex]\rm NaHCO_3[/tex] is not the limiting reactant.
Calculate the number of moles of [tex]\rm HC_2H_3O_2[/tex]needed to react with 0.00585 mol of [tex]\rm NaHCO_3[/tex]:
0.00585 mol [tex]\rm NaHCO_3[/tex] × (1 mol [tex]\rm HC_2H_3O_2[/tex]/ 1 mol [tex]\rm NaHCO_3[/tex]) = 0.00585 mol [tex]\rm HC_2H_3O_2[/tex]
As we see, only 0.00516 mol of [tex]\rm HC_2H_3O_2[/tex] are present, which is less than the amount needed (0.00585 mol), [tex]\rm HC_2H_3O_2[/tex] is the limiting reactant.
Therefore, [tex]\rm HC_2H_3O_2[/tex]is the limiting reactant in the provided chemical reaction.
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on food webs can i get some help with that
How many truck stop by the store on Wednesday
Answer:
More information so I can answer please.
Explanation:
Compare and contrast an endothermic and exothermic process.
Answer:
An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”
Explanation:
hope this helps
i did this for hw
Which structure of the skeletal system holds bones together?
joint
ligament
cartilage
Answer:
The answer is ligament
Explanation:
Hope that helps!
what does taking a neutral position about an issue mean?
It means to not favor either side of an argument, even if you believe one side may be right.
Convert 0.014 Mg to moles
Write an introductory text about metals, adding details you know
Answer:
See below
Explanation:
Most of the elements found on earth are metals. A look at the periodic table shows that these elements occupy the entire left-hand stretch of the table, from the main group, through the transition metals, lanthanides, actinides, alkali and alkaline earth elements. One element included here, hydrogen, is rarely classified as a metal. On earth, hydrogen is a gas, and it is usually classified as a non-metal, like oxygen and nitrogen. However, at very low temperatures and very high pressures, hydrogen is a solid, and under the right conditions it is expected to behave more like a metal. It is thought that gas giants, such as Jupiter and Saturn in our solar system, may have metallic hydrogen cores. Metallic elements are not generally found as single atoms. Instead, the atoms in an element such as iron cluster together to make a larger structure. The materials formed in this way have some similar properties. Metals are shiny. Metals are malleable; they can be bent and formed into different shapes (at least when heated). Metals are good conductors of electricity. In metals, large groups of atoms cluster together. Metal atoms form large, extended arrays, with the atoms repeating in specific patterns throughout the solid.
The properties of metals are really important. The fact that metals are malleable allows them to be formed into sheets that can be used to make cars, airplanes, railway lines, cargo containers and ships, as well as more delicate items such as jewelry and surgical tools. A related property, ductility, allows metals to be stretched into long, thin wires. Together with the conductivity of metals, this property allows transmission lines to carry electricity from generating stations to people like you. Sometimes, the source of electricity is hundreds of miles away; electricity used to power a laptop in New York may come from places like La Grande Baleine or James Bay, in northwestern Quebec. Some of these properties can be understood by thinking about the structure of metallic elements. A great deal of our structural understanding of metals and other materials comes from x-ray diffraction studies. A very focused beam of x-rays can be sent into a material, where they will bounce off the atoms and scatter in different directions. The outcome sounds chaotic, but if the solid is highly organized, the x-rays behave in very predictable ways. The result is an x-ray diffraction pattern. A diffraction pattern is a little like the pattern of ripples on a pond when a stone is thrown into calm water. The pattern can be studied and decoded mathematically to find the locations of the atoms within the material. X-ray diffraction can reveal the atomic-level structures of highly ordered materials such as metals. What does x-ray diffraction tell us? Evidently, a chunk of metal is not just a mass of atoms stuck together randomly. Instead, the atoms arrange themselves in neat layers in very specific ways. These layers of atoms sit on top of each other to form a three-dimensional solid. One of the properties that results from this organized arrangement of atoms is the malleability of metals. If you take a nice, soft metal such as copper, after annealing it in a fire or oven, it can be bent and shaped easily. With copper, this can be done even after the metal has cooled to room temperature. When you bend the copper, you are actually causing layers of atoms to slide over each other, until you stop bending and they come to rest in a new location. If you have ever done this, you'll know that the more you work with the copper, the harder it is to bend. That's because while you are sliding layers of atoms back and forth, occasionally an atom (or an entire row of atoms) slips out of place. It is no longer part of a smooth layer, and so other atoms can't slide past it as easily. This situation is called a defect. Once there are enough defects in the metal, it is impossible to bend the material anymore. Metal atoms are found in organized layers. Because these layers can roll over each other, metals can be worked into different shapes.
If you combine 390.0 mL of water at 25.00 ∘C and 100.0 mL of water at 95.00 ∘C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.
heat water 1 = heat water 2
mass of water = density x volume
because density = 1 g/ml then:
mass water 1 = 100 g
mass water 2= 390 g
Input the equation:
mcΔt 1 = mcΔt 2
100 . c . (95 - T) = 390 . c . (T - 25)
9500 - 100T = 390T - 9750
9500+9750 = 390T+100T
19250=490T
T=39.29 °C
A 300.0g sample of glass at 76.0C was placed in a large calorimeter containing 1000.0g of water. The water temperature was initially 23.9C. After the heat transfer, the water temp rose to 27.0C. Calculate the specific heat of the glass; then determine the percent error in this value.
For a 300.0g sample of glass at 76.0C placed in a large calorimeter containing 1000.0g of water, the specific heat of the glass and the percent error in this value are mathematically given as
C= 0.211 cal / g
% E = 5.5%
What are the specific heat of the glass and the percent error in this value.?
Generally, the equation for the balanced heat on glass is mathematically given as
Mg* SH of glass *dT of glass = Mwater * SH of water * dT of water
Therefore
300 * C * (76 - 27) = 1000 * 1 * (27 - 23.9)
C = 1000 * 3.1 / (300 * 49)
C= 0.211 cal / g
In conclusion,The precent error is
% E = (0.211 - 0.2) * 100 / 0.2
% E = 5.5%
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[tex]\Large \text{1)}[/tex]
[tex]\textbf{Use the formula and substitute the values}[/tex]
[tex]\displaystyle 0.3\ mol/L = \frac{n \ mol}{10 \times 10^{-3}\ L}[/tex]
[tex]\textbf{Solve for the number of moles}[/tex]
[tex]n = 0.003\ mol[/tex]
[tex]\textbf{Calculate final volume }[/tex]
[tex]40+10=50\ mL[/tex]
[tex]\textbf{Number of moles remains same. Solve for concentration}[/tex]
[tex]\displaystyle C=\frac{0.003\ mol}{50 \times 10^{-3}\ L} =0.06\ mol/L[/tex]
[tex]\Large \text{2)}[/tex]
[tex]\displaystyle DF=\frac{V_f}{V_i}[/tex]
[tex]\displaystyle DF=\frac{50}{10}=5[/tex]
I need help with Chemistry: Mole Conversion
It must be answered in complete detail
Answer:
As Per Given Information
Number of moles SO₂ ( Sulphur dioxide ) is 0.30
We 've been asked to find the number of atoms in given moles of Sulphur dioxide .
Value of Avogadro Number is 6.022 × 10²³ mol⁻¹
For finding the number of atoms we will use formale
[tex]\underline{\boxed{\textbf{\textsf{ Number \: of \: atoms \: = Given \: moles \: . Avogadro \: number}}}}[/tex]
Putting the given value we obtain
[tex] \sf \twoheadrightarrow \: Number \: of \: atoms \: = 0.30 \times 6.022 \times {10}^{ 23} \\ \\ \sf \twoheadrightarrow \: Number \: of \: atoms \: = \: 1.8066 \times {10}^{ 23} atoms[/tex]
So, the number of atoms in sulphur dioxide is 1.8066 × 10²³
No of atoms
No of moles ×Avagadro no0.3×6.023×10²³1.8066×10²³atoms