Answer:
4.8× 10²³ atoms
Explanation:
Given data:
Number of moles of San element = 0.796 mol
Number of atoms present = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
0.796 mol × 6.022 × 10²³ atoms / 1mol
4.8× 10²³ atoms
What is the reactant that runs out first in a reaction called?
O A. The stoichiometry
O B. The limiting reagent
OC. The reactant coefficient
OD. The theoretical yield
(Answer is B.)
Answer:
limiting reactant
Answer: B) limiting reagent
2.
Corona virus has a spherical shape. Its diameter is approximately 120 nm. How
many of them can sit side by side to form a circle around a piece of human hair.
Take the diameter of a hair as 50 um. (Select the nearest value to your calculation
result)
a) 1.23x10 12
b) 4.45 x106
C) 1312
d) 417
Answer:
417
Explanation:
50um is
50000nm
50000:120=417
The mass of magnesium ions in 1 kg of sea water is 1.3 g.
The concentration in parts per million (ppm) is
a 1.3x10^6
b 1.3x10^3
c 1.3x10^-3
I dont understand how to do this question. Help would be much appreciated!
Answer:
1300 ppm
Explanation:
for ppm, calculate fractional ration =(part/total) and multiply by 1 x 10⁶ => ppm
for ppb, calculate fractional ration =(part/total) and multiply by 1 x 10⁹ => ppb
Parts Per Million (ppm)
Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(10⁶) = 1300 ppm
Parts Per Billion (ppb)
or if ppb is needed do the same calculation but multiply by 10⁹ ... That is,
Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3/1000g)(10⁹) = 1300000 ppb = 1.3 x 10⁶ ppb
Parts per Hundred (pph) is the same as percent (%) ... Calculate fractional ratio and then multiply by 100%
Given 1.36g in 1Kg (=1000g) => fractional ratio = (1.3g/1000g)(100%) = 0.13%
What characteristic odor would you expect to observe if an alcohol reacted with acidified ethanoic acid?
a. A vinegar-like smell.
b. None.The product would be odorless.
c. A rotten fruit smell.
d. A fruity smell.
Calculate the pH for the following buffer solutions with steps.
1. 7.4862 grams of acetic acid and 10.4695 grams of sodium acetate are dissolved in enough deionized water to make 250.0 mL of solution.
2. 11.8115 grams of trimethylamine and 18.7088 grams of trimethylammonium chloride are dissolved in enough deionized water to make 500.0 mL of solution.
Thank You:)
Answer:
Answer is shown on the paper :D
Explanation:
Remember to follow sig-figs.
calculate h30+ for a 8.86*10^3 hbr solution
[H₃O⁺] = 8.86 x 10³ M
Further explanationThe dissociation of water :
H₂O(l)⇒H⁺+OH⁻
Hydrogen ions H⁺ bond with H₂O to form H₃O⁺ ions(hydronium ion)
When acid(Hbr acid) is in the presence of water(dissociates), the H⁺ ions bond with water molecules to form hydronium, the reaction :
HBr(aq)+H₂O→H₃O+(aq)+Br−(aq
So Ionization of HBr :
[tex]\tt HBr\rightarrow H_3O^++Br^-[/tex]
[HBr]= 8.86 x 10³,
From equation ratio [H₃O⁺] : HBr = 1 : 1, so
[tex]\tt [H_3O^+]=8.86\times 10^3[/tex]
A gaseous mixture of 1.0 mol of 12 and 1.0 mol of H2 was placed in an empty vessel that has a
volume of 2.0 L. The system was allowed to reach dynamic equilibrium at 300°C.
a) State briefly what happened to the initial concentration of 12 and H2 as the reaction reaches
equilibrium
b) Does the reaction stoop at equilibrium? Why?
Answer:
See detailed explanation.
Explanation:
Hello!
In this case, for the reaction:
[tex]I_2+H_2\rightleftharpoons 2HI[/tex]
It is known that the equilibrium constant tends to be greater than 1; therefore, it is a reaction that tends to go rightwards towards the formation of hydrogen iodide.
a) Here, since the reaction tends to form the product, it is clear that the initial concentration of iodine and hydrogen will decrease as the reaction reaches equilibrium in order to increase the concentration of hydrogen iodide.
b) Yes, it stops at the point in which the following expression:
[tex]\frac{[HI]^2}{[I_2][H_2]}[/tex]
Equals the equilibrium constant.
Best regards!
As the temperature of a gas increases with the volume remaining constant, the pressure of the gas A) decreases B) increases C ) remains the same
Answer:
B) increases
higher temperature = higher pressure
How many Joules of heat would be required
completely melt 5.00 grams of H2O(s) at 0°C at to
H2O(C) at 0°C?
Heat would be required : 1,670 J
Further explanationGiven
mass of H₂O=5 g
Required
Heat to melt
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Lf=latent heat of fusion
The heat of fusion for water at 0 °C : 334 J/g
Input given values in formula :
[tex]\tt Q=5\times 334=\boxed{\bold{1,670~J}}[/tex]
Identify the element in group 15, period 3 by drawing a Lewis Dot Structure
Answer:
Phosphorus
Explanation:
Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.
The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.
Why halogen of vinyl chloride is inert:
Answer:
in vinyl chloride there exist a partial double bond between chlorine and carbon atoms.this partial double bond increases the strength of bond between carbon and chlorine.
Explanation:
Answer:
1-because of mesomerism in carbon-halogen bond result to formation of a degree of double bond
Explanation:
[ Methylene=CH_X ] [ (-)Methylene_CH=X(+) ]
2- their preparation from ethylene dihalide
What volume of H2so4 Solution Cspecific gravity=-1.28 and strength =24.7% by mass) will be required to react completely with 125g ZnC032?
The volume = 309.04 ml
Further explanationGiven
Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄
mass 125g of ZnC0₃
Required
The volume of H₂SO₄ Solution
Solution
Reaction
ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O
mol of ZnCO₃(MW=125.4 g/mol) :
[tex]\tt mol=\dfrac{125}{125.4}=0.997[/tex]
From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997
mass of H₂SO₄ (MW=98 g/mol) :
[tex]\tt mass=mol\times MW=0.997\times 98=97.706~g[/tex]
mass of solution :
[tex]\tt \dfrac{100}{24.7}\times 97.706=395.57~g[/tex]
Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)
[tex]\tt V=\dfrac{395.57}{1.28}=309.04~ml[/tex]
What type of reaction is P4 + 3O2 = 2P2O3
Answer:
synthesis
Explanation:
hope this helps
The given reaction is a type of synthesis reaction.
• The reactions, which takes place when two distinct molecules or atoms associate to produce a distinct molecule or compound is known as synthesis reactions.
• The synthesis reactions are one of the prime categories of chemical reactions that comprise combustion reactions, single displacement, and double displacement reactions.
• In synthesis reactions, energy is released and the reaction is exothermic, in some cases, endothermic is also possible.
• In the given reaction atoms of phosphorus and oxygen combines to produce the compound phosphorus oxide.
Thus, the given case is an example of synthesis reaction.
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In a balanced chemical equation the mass of the reactants and products are equal.
True
False
A balanced chemical equation obeys the law of conservation of mass. In a balanced chemical equation the mass of the reactants and products are equal. The correct option is true.
What is a balanced chemical equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients. They are found in front of formulas.
According to law of conservation of mass, mass can neither be created nor be destroyed. But it can be transformed from one form to another.
In a balanced chemical equation, the total mass of the reaction remains constant. The mass of the reactants before reaction is equal to the mass of products after reaction.
Thus the given statement is true.
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A sample of Neon and Helium gases at 298 K have a total pressure of 29 atm. If the partial pressure of He is 6 atm, what is the mole fraction of neon?
if I use the answers from here wouldn't that come up as a high % plagiarism ??
Answer:
No
Explanation:
My sister uses this all the time and it is perfectly safe
Answer:
no
Explanation:
as long as you change it up a little and word it to look like your own
Question 15 helpppppppppppppp
Answer:
A
Explanation:
This is because of the law of conservation of mass. This means that even if a reaction occurs, the mass will remain the same.
New atoms will not be formed, but new compounds will.
if an endothermic reaction begins at 26°C and decreases by 2°C per minute how long will it take to reach 0°C?
Answer:
13 minutes
Explanation:
For the endothermic reaction to reach 0°C, it will take 13 minutes.
Let us follow the process step by step;
Rate of decrease is 2°C per minute.
Start is 26°C
Time temperature
0 min 26°C
1 min 24°C
2 min 22°C
3 min 20°C
4 min 18°C
5 min 16°C
6 min 14°C
7 min 12°C
8 min 10°C
9 min 8°C
10 min 6°C
11 min 4°C
12 min 2°C
13 min 0°C
PLS HELP WILL GIVE BRAINLYEST What happens when the magnet is removed from the coil in a circuit?
a.
The current stops
c.
The voltage decreases
b.
The current changes direction
d.
Power output increases
A student has 2 rubber balls of the same size and weight. Ball A is still and Ball B is rolling.Ball B hits Ball A, and Ball A start moving. Why does Ball A start moving?
Answer:
It starts to move because of Newtons first law "An object will not change it's motion unless a force acts on it"
Explanation:
Meaning ball B is that force acting upon ball A
Genetically engineered crops (3 points)
A. are often unsuccessful
B. create optimum soil
C. increase crop yields
D. prevent weed growth
Answer:
C. increase crop yields
Explanation:
Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.
The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.
The moment that X-locks are released will determine A. The compliance with ACID B. The anomalies present C. X-locks are always released during commit time D. The granularity of locks
Answer:
D. The granularity of locks.
Explanation:
X-locks is one of the locks used in locking database in what is known as adaptive server. Other types of locks for locking database are the S-lock, IS-locks, and the IX- locks. The locks are used mainly for control purpose[ that is when a data is been used by a lot of people, the locks make sure that there is consistency in the data.
The option D is correct that is; ''The moment that X-locks are released will determine the granularity of the locks'' The granularity of the locks simply means the amount in which the data can be locked at the same time.
Answer:
Option D (The granularity of locks)Explanation:
The answer is Option D, The Granularity of locks:
In computer science granularity locking is a locking method used in database management systems (DBMS) and relational databases, and granularity of locks in a database refers to how much of the data is locked at one time and it is determined when S locks are released which means Shared Locks.
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Which of the following is the fundamental element found in all living organisms? A-iron B-carbon C-calcium D-magnesium
Answer:
D
Explanation:
Answer:
For me
Explanation:
it's carbon because it's part of our regular respiration
1. A force of 30N is applied to a screwdriver to pry the lid off of a can of paint. The
screwdriver applies 90N of force to the lid. What is the MA of the screwdriver?
Answer:
I would guess that the MA of the screwdriver is 120N.
Explanation:
I think this because you are adding 30 and 90, since there are two forces being acted on the same place in the same direction.
#teamtrees #WAP (Water And Plant)
Please help me I really need this done
Answer is 2
4Fe + 3O2 –> 2Fe2O3
Please help ASAP!! i'll give you 100 point just to help me with this! 1-What places do the colors go. 2-Where do the words go. 3-Where do the arrows go. BTW this subject is Science.
Answer:
You have to put equator in middle, trade winds on which ever side they are trading the items on, probaly north, and westerlies west, and jet streams around blue at the bottom, red at top and green in the middle.
Explanation:
I cant really explain it right because I don't know how to put the picture. I mean paste the picture on here
CAN YOU TELL ME HOW TO PUT PICTURE
organic chemical used to preserve biological specimens is organic compound or hydrocarbons
Answer:
hydrocarbons
Explanation:
hope this is right.. if not sorry:)
can someone please help me with this....?
Answer:
Explanation:
The answer is D
Why does powdered calcium carbonate react faster with hydrochloric acid than calcium carbonate chips?
Answer:
Exposed surface area
Explanation:
The powdered calcium carbonate will react faster with hydrochloric acid than calcium carbonate chips due to the exposed surface area.
Powdered calcium carbonate has a larger surface area compared to the chips. And, the larger the surface area exposed on a body, the faster the reaction it will undergo.
For the same masses of a solid substance, the smaller the particle size of each form, the larger the surface area exposed to reaction.
The surface area exposed proportionally affects the rate of reaction.
Which property of gases is explained by the process of diffusion?
A.
their ability to compress under high temperature
B.
their ability to expand under low temperature
C.
their ability to expand under pressure
D
their ability to fill the available volume of a container
Answer:
The appropriate alternative is "Option D".
Explanation:
Diffusion would be a random or physical phenomenon that corresponds to that same transfer budget of molecules from some kind of highly concentrated area to something like a lower one. The substance which diffuses may be strong, liquids, and gaseous. Correspondingly, the framework where certain diffusion happens can however be amongst the three aspects of sustainability.All those other options aren't relevant to the situation in question. So the above alternative becomes the right one.