Answer:
[tex]atoms= 1.204x10^{24}atoms[/tex]
Explanation:
Hello!
In this case, according to the Avogadro's number, it is possible to compute the atoms of Kr in 2.00 moles as shown below:
[tex]atoms=2.00mol*\frac{6.022x10^{23}atoms}{1mol} \\\\atoms= 1.204x10^{24}atoms[/tex]
Best regards!
Which molecule has a high specific heat?
a) C2H6
b) C2H6O
c) H2O
There are four conditions an atom needs to meet to participate in hydrogen bonding. It needs to be_______ enough not to bump into other atoms when approaching the 1s orbital of the hydrogen, it needs to carry at least one________ atom, it needs to be_________enough to create a delta on the connected hydrogen, and it needs to have at least one________.
Answer:
The conditions are
1) Small enough
2) Electronegative atom
3) highly electronegative
4) lone pair of electrons
The correct statement therefore is
It needs to be small enough not to bump into other atoms when approaching the 1s orbital of the hydrogen, it needs to carry at least one electronegative atom, it needs to be highly electronegative enough to create a delta on the connected hydrogen, and it needs to have at least one lone pair of electrons.
Explanation:
Hydrogen bonding is a type of intermolecular bond that occurs between the partial positive charge (delta) on a hydrogen atom bonded to a small highly electronegative element (like nitrogen, oxygen or fluorine) and the free electrons on another electronegative element of another molecule.
The hydrogen atom with the partial positive charge (delta) is known as the hydrogen bond donor, while the electronegative element, carrying lone electrons is called the hydrogen bond acceptor.
Let's take a deeper look at these terms:
1) Hydrogen bond donor
Using water (H₂O) as an example, the high electronegativity of the oxygen atom covalently bonded to the hydrogen atom draws the lone electron in the 1s orbital of the hydrogen atom, creating a partial positive charge (d⁺) on the hydrogen atom. This is what happens within one water molecule
2) Hydrogen bond acceptor
When two or more molecules of water interact, the partial positive charge (d⁺) on the hydrogen atom of one molecule, is attracted to the valence or free electrons on the oxygen atom of a nearby molecule of water thus creating a dipole-dipole intermolecular bond known as a hydrogen bond.
For the hydrogen bond to be effective, the electronegative atom bonded to the hydrogen acting as the hydrogen bond donor in the first water molecule needs to be small enough so as not to disrupt the 1s orbital of the hydrogen atom. The smaller the size of the electronegative atom, the stronger the partial negative charge created on the hydrogen atom.
The valence or free pair of electrons on the electronegative (oxygen) atom of the second molecule of water (hydrogen bond acceptor) is what attracts the partial positive charge on the hydrogen atom to create the hydrogen bond
Why is it important to know gas properties at STP?
Answer:
STP values are most often cited for gases because their characteristics change dramatically with temperature and pressure. One common definition of STP is a temperature of 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure of 1 atm. Under these conditions, one mole of a gas occupies 22.4 L.
4. How many grams are there in 7.5 x 1027 formula units of Sr(OH)2?
5. How many grams are there in 9.30 x 1026 molecules of H2SO4?
PLEASE ANSWER I WILL MARK YOU BRAINLIEST
Answer:
4) 1.52 × 10^6 g
5) 1.51 × 10^5 g
Explanation:
4. There are 121.63 g/mol of Sr(OH)₂, and there are 6.02214·10^23 formula units per mol. Then the number of grams is ...
(7.5×10^27 formula units) × (121.63 g)/(6.02214×10^23 formula units)
= 7.5×121.63/6.02214 × 10^4 g
≈ 1.52 × 10^6 g
__
5. H₂SO₄ has a molar mass of about 98.079 g, so the given quantity has a mass of about ...
(9.30×10^26 formula units)(98.079 g)/(6.02214×10^23 formula units)
= 9.30×98.079/6.02214 × 10^3 g
≈ 1.51 × 10^5 g
Answer:
4. 1.52×10^6 g
5. 1.51×10^5 g
Explanation:
hope it helps
#CARRYONLEARNING
7. A number of reactions that take place on the surfaces of catalysts are zero order in the reactant. One example is the decomposition of ammonia on hot tungsten. In one experiment, the partial pressure of ammonia decreased from 21 kPa to 10 kPa in 770 s. (a) What is the rate constant for the zero-order reaction
Answer:
14.29 Pa/s
Explanation:
Given that, for a zero order reaction;
[A] = [A]o - kt
[A] = pressure at time =t
[A]o = initial pressure
k = rate constant
t = time taken
10 * 10^3 Pa = 21 * 10^3 Pa - 770k
10 * 10^3 Pa - 21 * 10^3 Pa = -770k
-11* 10^3 = -770k
k = -11* 10^3/-770
k = 14.29 Pa/s
Liquid hexane CH3CH24CH3 will react with gaseous oxygen O2 to produce gaseous carbon dioxide CO2 and gaseous water H2O. Suppose 4.3 g of hexane is mixed with 25.8 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Round your answer to 2 significant digits.
Answer:
13g of CO₂ is the maximum amount that could be produced
Explanation:
The reaction of hexane with oxygen is:
C₆H₁₄ + 19/2O₂ → 6CO₂ + 7H₂O
Where 19/2 moles of oxygen react per mole of C₆H₁₄
To solve this question we need to find theoretical yield finding limiting reactant :
Moles C₆H₁₄:
4.3g C₆H₁₄ * (1mol / 86.18g) = 0.0499 moles
Moles O₂:
25.8g * (1mol / 32g) = 0.806 moles
For a complete reaction of 0.0499 moles of C₆H₁₄ are needed:
0.0499 moles of C₆H₁₄ * (19/2 mol O₂ / 1mol C₆H₁₄) = 0.474 moles of O₂.
As there are 0.806 moles, O₂ is in excess and C₆H₁₄ is limiting reactant
In theoretical yield, the moles of hexane added = 6Moles of CO₂ produced. Moles of CO₂ are:
0.0499 moles C₆H₁₄ * (6mol CO₂ / 1mol C₆H₁₄) = 0.299 moles CO₂
In grams:
0.299 moles CO₂ * (44.01g / mol) = 13g CO₂
13g of CO₂ is the maximum amount that could be produced
We use less than 1% of the water on Earth for
Answer: drinking, bathing.
Explanation:
what information is given on a material safety data sheet?
Answer:
The MSDS lists the hazardous ingredients of a product, its physical and chemical characteristics (e.g. flammability, explosive properties), its effect on human health, the chemicals with which it can adversely react, handling precautions, the types of measures that can be used to control exposure, emergency and first
Explanation:
just put:- it lists the hazardous ingredints- its effect on human health- how the chemicals react to it- how to hanle- how to control exposuresHOPE THIS HELPS!BRAINLIEST?What is the correct name for Hg(NO3)2?
Mercury (I) nitrate
Mercury (II) nitrate
Mercury nitroxide
Mercury dinitride
Answer: Hg(NO3)2 = Mercury (II) nitrate
The other answer is wrong. Mercury (I) nitrate is Hg2(NO3)2.
if a gas at 300k occupies 3.60 liters at a pressure of 1.00 atm, what will be it’s new pressure if the volume is compressed to 2.0 liters at a temperature of 450K?
Answer: The new pressure if the volume is compressed to 2.0 liters at a temperature of 450K is 2.7 atm
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 1.00 atm
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = 3.60 L
[tex]V_2[/tex] = final volume of gas = 2.0 L
[tex]T_1[/tex] = initial temperature of gas = [tex]300K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]450K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{1.00\times 3.60}{300}=\frac{P_2\times 2.0}{450}[/tex]
[tex]P_2=2.7atm[/tex]
The new pressure is 2.7 atm
What mass (g) of magnesium nitride (Mg3N2) can be made from the reaction of 1.22 g of magnesium with excess nitrogen? __Mg + __N2__Mg3N2
a. 1.69 b. 15.2
c. 5.07 d. 5.02 e. 3.38
I’ll give brainest
1.69 g Mg₃N₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisReactions RxNExplanation:Step 1: Define
[RxN - Unbalanced] Mg + N₂ → Mg₃N₂
[RxN - Balanced] 3Mg + N₂ → Mg₃N₂
[Given] 1.22 g Mg
[Solve] grams Mg₃N₂
Step 2: Identify Conversions
[RxN] 3 mol Mg → Mg₃N₂
[PT] Molar Mass of Mg - 24.31 g/mol
[PT] Molar Mass of N - 14.01 g/mol
Molar Mass of Mg₃N₂ - 3(24.31) + 2(14.01) = 100.95 g/mol
Step 3: Stoich
[DA] Set up: [tex]\displaystyle 1.22 \ g \ Mg(\frac{1 \ mol \ Mg}{24.31 \ g \ Mg})(\frac{1 \ mol \ Mg_3N_2}{3 \ mol \ Mg})(\frac{100.95 \ g \ Mg_3N_2}{1 \ mol\ Mg_3N_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1.68873 \ g \ Mg_3N_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.68873 g Mg₃N₂ ≈ 1.69 g Mg₃N₂
Difference between Aluminum and Duralumin
What is the molecular formula for hydrogen peroxide?
cos(A)+cos(2A)+cos(3A)=0 is not an identity
Answer:
this is the required answer look it once
describe how zinc oxide is made from zinc sulfide
How many liters of a 15% NaCl solution should be mixed with 2 L of a 20% NaCl solution to obtain a 16%
NaCl solution?
Answer:
8 liters of 15% NaCl solution should be mixed with 2 L of a 20% NaCl solution to obtain a 16% NaCl solution
Explanation:
The method employed here is known as alligation technique.
Alligation is a method used to calculate the proportion of any two solutions to be mixed to prepare final solution of required concentration.
Let the number of liters of the 15% NaCl solution be X
A mixture of X liters of 15% NaCl + 2 liters of 20% NaCl gives X + 2 liters of a solution whose concentration is 16%
X * 15% + 2 * 20% = 16% * X + 2
0.15X + 2 * 0.2 = 0.16 X + 0.16 * 2
0.15X + 0.4 = 0.16X + 0.32
0.16X - 0.15X = 0.4 - 0.32
0.01X = 0.08
X = 0.08/0.01
X = 8 liters
Therefore, 8 liters of 15% NaCl solution should be mixed with 2 L of a 20% NaCl solution to obtain a 16% NaCl solution
Given the following steps for a mechanism:
Step 1: O3 + NO = NO2 + O2 (slow)
Step 2: NO2 + O = NO + O2(fast)
Define mechanism.
Explanation:
Prokaryotes have the advantages associated with greater simplicity, including more rapid reproduction, rapid mutation and adaptation to new environments, and more diverse metabolic systems. They also possess an ability to pass on adaptive genes to other bacteria in the form of plasmids.
Which process is not a state of matter change
A.melting
B.freezing
C.stirring
D.evaporation
Answer:
C. sterling hope it helps
what is a arieal animals?
What is the ratio
amount (mol) Fatoms
amount (mol) Xe atoms
Enter your answer as an integer.
Pls help
Answer:
Empirical formula
Explanation:
The empirical formula of a compound is the simplest whole number ratio of atoms of each element in the compound. It is determined using data from experiments and therefore empirical.
Two reactants that are used in the process of cellular respiration are
glucose and water
oxygen and water.
water and carbon dioxide.
carbon dioxide and oxygen.
Answer:
The answer is actually glucose and oxygen
Sarah was walking and picked up a rock that she thought looked interesting. The rock appeared to have layering, and contain fragments of shells and bones. What is the correct classification of the rock Sarah picked up?
Igneous
Metamorphic
Sedimentary
Volcanic
When did Martin Luther king JR became a pastor/minister?
What is a net ionic equation?
A. An equation that shows all substances as compounds
B. An equation that is balanced on both sides
C. An equation showing only what is involved in the reaction
D. An equation that shows all dissolved compounds as ions
Answer:
I think it will option D hope it helps
How is a magnetic field produced?
O when an electromagnetic field interacts with a magnet
O when a current runs through a conductor
O when an object has an electric charge
O when electrons move through a circuit
Answer:
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. ... Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
Answer: when an electromagnetic field interacts with a magnet
Explanation:
Under certain conditions the rate of this reaction is zero order in ammonia with a rate constant of :
0.0067·Ms−1: 2N2O(g)→2N2(g)+O2(g)
Suppose a flask is charged under these conditions with of ammonia. After how much time is there only left? You may assume no other reaction is important. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answer:
Explanation:
From the given information:
[tex]2NO_2_{(g)} \to 2N_{2(g)} + O_{2(g)}[/tex]
The above reaction is a zero-order reaction.
The rate constant = 0.0067 M-s⁻¹
Suppose the volume of the flask = 4L
Initial Mol of dinitrogen monoxide = 300 mmol
The final mol of dinitrogen monoxide = 150 mmol
The molarity of dinitrogen monoxide = [tex]\dfrac{ \text{number of moles of dinitrogen monoxide }}{\text{volume of flask}}[/tex]
[tex]= \dfrac{300 \ m}{ 4 L}[/tex]
= 0.0075 mmol/L
= 0.0075 L
The final concentration [tex]= \dfrac{150 \ m}{ 4 L}[/tex]
= 0.0375 L
By applying zero order equation
[tex]kt = [A_o] -[At][/tex]
[tex](0.0067)(t) = 0.075 - 0.0375[/tex]
[tex](0.0067)(t) = 0.0375[/tex]
[tex]\mathbf{t = 5.59 \ seconds}[/tex]
How are you finding the moles of the unknown substance when you are only given the grams of the unknown molecular compound?
Answer:
Determine the moles of unknown (the solute) from the molality of the solution and the mass of solvent (in kilograms) used to make the solution. Determine the molar mass from the mass of the unknown and the number of moles of unknown.
g In science, we like to develop explanations that we can use to predict the outcome of events and phenomena. Try to develop an explanation that tells how much NaOH needs to be added to a beaker of HCl to cause the color to change. Your explanation can be something like: The color change will occur when [some amount] of NaOH is added because the color change occurs when [some condition]. The goal for your explanation is that it describes the outcome of this example, but can also be used to predict the outcome of other examples of this phenomenon. Here's an example explanation: The color of the solution will change when 40 ml of NaOH is added to a beaker of HCl because the color always changes when 40ml of base is added. Although this explanation works for this example, it probably won't work in examples where the flask contains a different amount of HCl, such as 30ml. Try to make an explanation that accurately predicts the outcome of other versions of this phenomenon.
Answer:
See explanation
Explanation:
A titration involves the addition of a titrant to an analyte solution. It is a method of volumetric analysis.
When a particular volume of titrant is added, the colour changes to signal the end point of the reaction.
The point at which the colour changes is called the equivalence point. This is the point at which the amount of titrant added is just enough to completely neutralize the analyte solution.
Hence the volume NaOH that needs to be added to the beaker containing HCl to cause a colour change is the volume of NaOH that is just enough to completely neutralize the HCl solution.
Which is the correct molar mass for the compound h2SO4
Explanation: just add the atomic masses on the periodic table together for each atom.
Answer:Sulfuric acid
Explanation:because I said so
Mason notices that his boat sinks lower in the water in a freshwater lake than in the ocean. what could explain this
Answer:
Mason notices that his boat sinks lower into the water in a freshwater lake than in the ocean. What could explain this?
Explanation:
The freshwater has less density then the ocean!