Answers
A)
1 mol MgBr2: 2 mol KBr
x mol MgBr2: 7 mol KBr
\( \frac{1}{2} = \frac{x}{7} \)
\(x = \frac{7}{2} \)
x＝3.5 mol
B)
1 mol MgBr2: 2 mol KBr
2 mol MgBr2: y mol KBr
\( \frac{1}{2} = \frac{2}{y} \)
y＝4 mol
If we produce 7 moles of KBr, 3.5 moles of MgBr₂ we needed and if we produce 2 moles of MgBr₂, 4 moles of KBr needed.
What is Stoichiometry ?
Stoichiometry helps us use the balanced chemical equation to measures quantitative relationships and it is to calculate the amount of products and reactants that are given in a reaction.
According to the reaction
2K + MgBr₂ → 2KBr + Mg
To produce 2 moles of KBr, 1 mole of MgBr₂ is needed.
So, to produce 7 moles of KBr we need
7 moles KBr × \(\frac{1\ \text{mole}\ MgBr_2}{2\ \text{moles}\ KBr}\)
= 3.5 moles of MgBr₂
Now,
To produce 2 moles of MgBr₂ we need
2 moles of MgBr₂ × \(\frac{2\ \text{moles}\ KBr}{1\ \text{mole}\ MgBr_2}\)
= 4 moles of KBr
Thus, we can say that if we produce 7 moles of KBr, 3.5 moles of MgBr₂ we needed and if we produce 2 moles of MgBr₂, 4 moles of KBr needed.
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Related Questions
Describe the motion of molecules in these two
substances when the ice cube is placed on the
radiator.
Answers
Answer:
When in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
Answer
when in direct contact, the fast-moving molecules in the radiator collide with the slow-moving molecules in the ice cube. Kinetic energy is transferred from the molecules in the radiator to the molecules in the ice cube, causing a slowdown of the radiator molecules and an acceleration of the ice molecules.
Explanation:
How many single covalent bonds could an element with the electron
configuration 1s2 2s2 2p5 form?
A-2
B-3
C-1
D-4
Answers
Answer:
1
Explanation:
I would say 1 because that configuration has 7 valence electrons. The goal of the atom is to gain a full octet so it just needs to gain 1 more electron to get the full octet. To get the one electron to fill the valence shell it would only need to have 1 covalent bond.
I hope this helps. Let me know if anything is unclear.
A single covalent bond could be formed by an element with the electron configuration 1s2 2s2 2p5 in the form C.1.
How do electron configurations work?An electron configuration is a description of the positions of electrons around a nucleus. The symbols used to represent the electron configuration start with the shell number (n), then the type of orbital, and finally the superscript indicates how many electrons are in the orbital. As previously stated, each neutral atom contains a specific number of electrons.I would answer 1 because there are 7 valence electrons in this configuration. Because that is what the atom desires, it only requires one more electron to complete its octet. For the single electron to fill the valence shell, only one covalent link would be required.To learn more about electron configurations refer to:
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Determine the molar masses of the following compounds.
a. Al2(SO4)3 b. (NH4)3PO4 c. C2H4O2
Answers
The molar masses of the compounds are;
a) 342 g/mol
b) 149 g/mol
c) 60 g/mol
What is the molar mass?Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol). It is calculated by adding up the atomic masses of all the atoms in a molecule, or the formula weight of a compound. The molar mass is an important concept in chemistry, as it allows scientists to calculate the amount of a substance present in a sample based on its mass or vice versa.
We can calculate the molar masses as follows;
a) 2(27) + 3(32 + 4(16))
= 342 g/mol
b) 3(14 + 4(1)) + 31 + 4(16)
= 149 g/mol
c) 2(12) + 4(1) + 2(16)
= 24 + 4 + 32
= 60 g/mol
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what is the combined gas law equation
Answers
Answer:
\frac {P_{1}V_{1}}{T_{1}}=\frac {P_{2}V_{2}}{T_{2}}
Explanation:
Gay-Lussac's law states that at constant volume, the pressure of a gas is directly proportional to the absolute temperature, P ∝ T at constant V. These three gas laws can be combined into a so-called combined gas law, P 1 V 1 T 1 = P 2 V 2 T 2.
If 5.0 mL of 0.10 M NaOH is added to 50. mL of 0.10 M HCI, what will be the resulting
pH of the solution?
Round your answer to two decimal places.
Provide your answer below:
PH
Answers
Note that NaOH and HCl are the reactants of the reaction. Since they’re a strong acid and base, they would completely dissociate, meaning the molarity of H+ is equal to the molarity of HCl (same applies for NaOH and OH-) which also means the moles are the same.
Solve for the moles after the reaction has fully occurred then use the total volume (since this is the end of the reaction, volumes are fully mixed) and find the new molarity of H+ since our NaOH was our limiting reactant.
The plug the molarity of H+ into the formula pH = -log[H+] and get the pH of 1.09
Answer:
1.09
Explanation:
Keep in mind that the volume of the solution changes during this titration, so to compute the amount of hydronium that is neutralized during this addition of base (in order to calculate the final pH of the solution), we must calculate the moles of all species in solution initially present. Because both NaOH and HCl ionize completely:initial mol OH−=mol NaOH=(0.0050 L)(0.10 molL)=0.00050 mol OH−initial mol H3O+=mol HCl=(0.050 L)(0.10 molL)=0.0050 mol H3O+The acid is in excess, so all of the OH− present will neutralize an equivalent amount of H3O+, forming water. Thus we simply subtract the moles of hydroxide from the moles of hydronium in solution to find the resultant moles of H3O+ after this neutralization:final mol H3O+= initial mol H3O+−initial mol OH−final mol H3O+=0.0050 mol−0.00050 mol=0.0045 mol H3O+We now calculate the total volume of the solution by adding the volumes of acid and base initially combined: 0.050 L+0.0050 L=0.055 LTo get [H3O+], we divide the final moles of hydronium by the final solution volume:[H3O+]=final mol H3O+ total volume=0.0045 mol0.055 L≈0.08181molLFinally, to find pH:pH=−log[H3O+]=−log(0.08181)=1.09Since the hydronium concentration is only precise to two significant figures, the logarithm should be rounded to two decimal places.
8. An ion with 5 protons, 6 neutrons, and a charge of 3+ has an
atomic number of
a) 5
b) 6
c) 8
d) 11
Answers
Atomic number = The number of proton in an atom or ion so the right answer is 5!
What is an indicator?
Answers
Hope it helps you!!
17. How many grams of NO2 (46.0 g/mol) will be produced by the reaction of 43.9 g of
NH3 (17.03 g/mol)?
4NH3 (g) +702 (g) → 4NO2 (g) + 6H2O(g)
Answers
The mass of \(NO_2\), in grams, that would be produced by the reaction will be 118.68 grams.
Stoichiometric problemFirst, let's write out the balanced equation of the reaction:
\(4NH_3 (g) +7O_2 (g) -- > 4NO_2 (g) + 6H_2O(g)\)
From the equation, the mole ratio of \(NH_3\) and \(NO_2\) is 1:1.
Recall that, mole = mass/molar mass.
43.9 g of \(NH_3\) = 43.9/17.03
= 2.58 mol
Thus, from the 1:1 mole ratio, the equivalent mole of \(NO_2\) produced from the reaction would be 2.58 mol.
Since, mass = mole x molar mass, the mass of 2.58 mol of \(NO_2\) can be calculated as:
2.58 x 46.0 = 118.68 grams.
In other words, the amount of \(NO_2\) produced by the reaction of 43.9 g of \(NH_3\) according to the chemical equation would be 118.68 grams.
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caed for this question.
A student reads a barometer in the laboratory and finds the prevailing atmospheric pressure to be 731 mm Hg. Express this
pressure in atmospheres, kilopascals, torrs, pounds per square inch, and pascals.
Hint: 1 atm
101.3 kPa = 760 torr = 760 mm Hg = 14.69 psi = 1.013*10Pa
mm Hg
atm
kPa
torr
psi
Pa
731
Submit Answer
Retry Entire Group
8 more group attempts remaining
Answers
Answer:
0.962 atm.
97.4 kPa.
731 torr.
14.1 psi.
97,434.6 Pa.
Explanation:
Hello.
In this case, given the available factors equaling 1 atm of pressure, each required pressure turns out:
- Atmospheres: 1 atm = 760 mmHg:
\(p=731mmHg*\frac{1atm}{760mmHg} =0.962atm\)
- Kilopascals:: 101.3 kPa = 760 mmHg:
\(p=731mmHg*\frac{101.3kPa}{760mmHg} =97.4kPa\)
- Torrs: 760 torr = 760 mmHg:
\(p=731mmHg*\frac{760 torr}{760mmHg} =731 torr\)
- Pounds per square inch: 14.69 psi = 760 mmHg:
\(p=731mmHg*\frac{14.69}{760mmHg} =14.1psi\)
- Pascals: 101300 Pa = 760 mmHg:
\(p=731mmHg*\frac{101300Pa}{760mmHg} \\\\p=97,434.6Pa\)
Best regards.
Please help find out code?
Answers
if u trust urself do it! (not sponsored by nike)
Which is one factor that contributes to the formation of polar, temperate, and tropical zones?
the angle of the Sun’s rays
the direction of seasonal winds
the presence of prevailing winds
the movement of wind near a mountain
Answers
Answer: A) The angle of the Sun's rays!
Answer:
A) The angle of the Sun's rays!
Explanation:
______ is produced anytime current flows in a circuit, due to the collision between the flowing free electrons and the fixed atoms.
Answers
Heat is produced anytime current flows in a circuit, due to the collision between the flowing free electrons and the fixed atoms. When an electric current flows through a conductor, the free electrons move through the lattice of atoms.
As they move, they collide with the fixed atoms, causing the atoms to vibrate and transfer energy to neighboring atoms. This energy transfer increases the temperature of the conductor, resulting in the production of heat.
The amount of heat produced is directly proportional to the amount of current flowing through the conductor, the resistance of the conductor, and the time for which the current flows. This relationship is described by Joule's law, which states that the heat produced is equal to the product of the current, the resistance, and the time.
Mathematically, this can be expressed as H = I^2RT, where H is the heat produced, I is the current, R is the resistance, and T is the time. The collision between the flowing free electrons and the fixed atoms in a conductor leads to the production of heat, which is proportional to the current, resistance, and time for which the current flows.
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I need help solving this ASAP PLS
Answers
Answer:31.58
Explanation:
24-2+8
One time I went to the mountains. I was scared of altitude sickness, so I got cannisters of oxgen (O₂). These cannisters contain 2L of compressed oxygen (O₂). When the oxygen is pressurized, it condenses into its liquid form inside the cannister. How much would this oxygen (0₂) weigh in its liquid form?
2.9 grams
1.6 grams
3.6 grams
4.3 grams
Answers
The 2.9 grams would this oxygen (0₂) weigh in its liquid form.
What is oxygen ?
The sole sort of atom in oxygen makes it a chemical element, which is a substance. An oxygen atom has eight protons in its nucleus, as indicated by its atomic number of 8, which is represented by the letter O in its official chemical formula. At room temperature, oxygen is a gas that lacks all other flavors, smells, and colours. Molecular oxygen can be found in nature.
What is liquid ?
Unlike a solid, which is more rigid than a liquid, a liquid is a kind of substance with unique qualities. The opposite of a solid, which has a defined shape, is a liquid, which can flow. An alternative is that a liquid will take on the shape of the container it is held in.
Therefore, 2.9 grams would this oxygen (0₂) weigh in its liquid form.
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1.40 g H2 is allowed to react with 9.66 g N2, producing 2.24 g NH3
.
What is the theoretical yield in grams for this reaction under the given conditions?
Answers
The theoretical yield of NH₃ produced under the given conditions is 11.75 g.
The balanced equation for the reaction between hydrogen (H₂) and nitrogen (N₂) to form ammonia (NH₃) is;
N₂ + 3H₂ → 2NH₃
To determine the theoretical yield of NH₃ produced from the given amounts of H₂ and N₂, we need to calculate the limiting reactant and then use stoichiometry to find the maximum amount of NH₃ which can be produced.
The molar masses of H₂, N₂, as well as NH₃ are;
H₂; 2.02 g/mol
N₂; 28.02 g/mol
NH₃; 17.03 g/mol
The number of the moles of each reactant will be calculated as;
moles of H₂ = mass of H₂ / molar mass of H₂ = 1.40 g / 2.02 g/mol = 0.693 mol
moles of N₂ = mass of N₂ / molar mass of N₂ = 9.66 g / 28.02 g/mol = 0.345 mol
To determine the limiting reactant, we need to compare the mole ratios of H₂ and N₂ in the balanced equation with the actual mole ratios of the reactants. The balanced equation shows that 1 mole of N₂ will reacts with 3 moles of H₂ to produce a 2 moles of NH₃. The actual mole ratio of N₂ to H₂ in the reaction mixture is;
moles of N₂ / moles of H₂ = 0.345 mol / 0.693 mol
= 0.498
This ratio is less than the required ratio of 1/3, which means that N₂ is the limiting reactant. This means that all the N₂ will be consumed in the reaction and the amount of NH₃ produced will depend on the amount of N₂ present.
Using the mole ratio from the balanced equation, we can calculate the theoretical yield of NH₃ that can be produced from the 0.345 mol of N₂;
moles of NH₃ = (0.345 mol N₂) × (2 mol NH3 / 1 mol N₂)
= 0.690 mol NH₃
The mass of this amount of NH₃ can be calculated as;
mass of NH₃ = moles of NH₃ × molar mass of NH₃ = 0.690 mol × 17.03 g/mol = 11.75 g
Therefore, the theoretical yield is 11.75 g.
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Charged Particles
Charge on Particle Number of Particles
Positive 3
Negative 2
A negatively charged substance is brought near the ion. What will most likely happen?
(A) The negatively charged ion will repel the substance.
(B) The negatively charged ion will attract the substance.
(C) The positively charged ion will repel the substance.
(D) The positively charged ion will attract the substance.
Answers
Answer:
D
Explanation:
cause overall charge is +1 so will attract
PLEASE ANSWER!! THANK YA!
Using Graham's Law of Effusion, calculate
the approximate time it would take for
1.0 L of argon gas to effuse, if 1.0 L of
oxygen gas took 12.7 minutes to effuse
through the same opening.
Answers
Answer:
I think the answer is X
Explanation:
X is a variable and variables stand for the unknown
Which statement best describes a mechanical wave?
Answers
Answer:
A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.
Explanation:
While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position.
--------------
hope this helped!
✼-answers by brookeangelx
The wave transmits energy from one point to another in the form of signals. Some waves require a medium for propagation while some others does not require a medium for the propagation.
What is a mechanical wave?The mechanical wave is defined as the wave which involves the oscillation of matter and it is responsible for the transfer of energy through a medium. These types of waves does not need a medium for propagation.
The mechanical waves cannot travel through vacuum. Some of the examples of mechanical waves are sound waves, water waves, seismic waves, etc. These waves are not capable of transmitting its energy through a vacuum.
The sound wave is a mechanical wave and the medium which it propagates can be solid, liquid or gas. It can travel fastest in solids and slower in gases.
Thus mechanical wave is an oscillation of matter.
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An early arrangement of the then known elements was proposed by a British scientist John Newlands, which he called the Law of Octaves. Like other scientists at the time, Newlands arranged the elements in order of increasing atomic mass and noted that every eighth element had similar physical/chemical properties. In the modern Periodic Table, which of the following represents the last pair of elements for which Newlands' Law of Octaves would hold true?
Answers
11.0g of sulfur hexafluoride gas to liters of sulfur hexafluoride.
hurry pls
Answers
Divide the weight with 1,000 times the component or material's density to the conversion from grammes to litres. Sulfur hexafluoride in litres is produced from 11.0g of sulphur hexafluoride gas. 0.0753138778434317.
Does 1 kilogramme equal 1 litre?What volume of water is equivalent to one kilogramme. When pure water attains a maximum density of one kg/l at a temperature around 39.2 °F or 4 °C, it has a volume of 1 litre. 1 kilogramme of water is somewhat more than 1 litre at higher temperatures.
How much mol of S are there in 4.0 g of SF6?As there is one mole of SF in every six moles, there are now 0274 moles in total. After solving, we get the result of.164 mole of fluorine. Adding 1 mole will also have 6 moles od fluorine, giving us 0.0274 moles in s f, 6, corresponding to 6 times in 0.0274 mole of chlorine. Hence, in 4 grammes.
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how is acid different from base
Answers
As
lab: reaction rate student guide
Answers
When changing the concentration of chemical species in an experiment, the rate of chemical reaction can be measured by measuring the amount of the reactants involved or substances produced.
How the measurement of concentration of reactants or products helps in determining the reaction rate.The rate of chemical reactions in a given system is defined as the the speed of rate at which reaction occurs. However, it is also defined as a measure of change in concentration of reactants involved in the chemical reaction or the measure of the change in concentration of substances produced in a reaction per unit time. The time take for this to happen speaks volume of the speed of the reaction rate.
From the context of the task given above, the reaction rate can be measured in a function of the products formed per unit time.
In conclusion, we can now confirm and deduce from step by step explanations above that the concentration of chemical species per unit time is a function of reaction rate.
Complete question:
lab: reaction rate student guide
How would you measure reaction rate in the laboratory when changing concentrations?
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_N₂+_H₂→ _NH₃
Balance equation
Answers
Answer:
N2+(3)H2=(2)NH3
explanation:
N+H→NH3
We must remember that Nitrogen and Hydrogen are both diatomic molecules in their standard gas form. This adjusts the equation to
N2+H2→NH3
Now we need to adjust coefficients in order to balance the atoms on each side of the equation. Currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.
We can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.
N2+3H2→2NH3
This gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.
8. Base your answer to the following question on the equation below.
2H2(g) + O2(g) → 2H₂O()+571.6 kJ
Identify the information in this equation that indicates the reaction is exothermic.
Answers
The positive value of 571.6 kJwhich is the enthalpy change tells us that it is exothermic
What is an exothermic reaction?When energy is released into the surrounding area during a chemical reaction, it's considered an exothermic reaction with ΔH < 0. Conversely, endothermic reactions result from heat absorption with ΔH > 0.
The provided equation's positive value of 571.6 kJ reveals that heat is pouring out of the reaction, causing negative changes in enthalpy and firmly placing this chemical event as exothermic in nature.
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What waves are used to send signals because they can travel over very long distances and pass through buildings
Answers
Answer:
sound waves for used I think
99% of all matter that can be observed in the universe exist as ...
A plasma
b liquids
c solids
d gases
Answers
99% of all the matter that can be observed in the universe exists as
A. Gases
B. Plasmas
C. Liquids
D. Solids
At ground level, how are rain and hail similar?
They are forms of water in its liquid state.
They occur when the temperature is below freezing.
They can occur when the air is hot and moist.
They are most common in the winter.
Answers
They are forms of water in its liquid state at ground level. Thus, the correct option is A.
What is hailstrom?Precipitation, or water in the atmosphere, forms hail. When water drops freeze together in the chilly higher parts of thunderstorm clouds, hail is the result.
When a water droplet is lifted by an updraft from a thunderstorm over the freezing point of the atmosphere, hail is created. The super-cooled water or water vapor that the frozen water droplet accretes later freezes when it comes into touch with it. A hailstone grows as a result of this process.
When water vapor from the atmosphere condenses into liquid water droplets, they become heavy enough to fall as a result of gravity.
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Answer:A
Explanation:
.
If a molecule has a triple bond, what can be assumed about the bond compared to a molecule with a double bond?
The length is more than a double bond
The strength is more than a double bond
The strength is less than a double bond
The length is the same as a double bond
Answers
While the length is less than a double bond, the strength exceeds that of a double bond.
Within the same molecule, how do triple bonds differ from double bonds?Due to the presence of two bonds rather than one, triple bonds are stronger than double bonds. An sp-sp sigma bond is created when one of each carbon atom's two sp hybrid orbitals intersects with the corresponding orbital from the other carbon atom.
Compared to double bonds, are triple bonds more durable and longer?Six electrons are shared by a sigma bond, two bonds, and a triple bond. Double bonds are more powerful than single bonds, and triple bonds are more powerful than double bonds, according to experiments.
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Answer: third
Explanation:
Enter the complementary strand of this DNA strand. Give your answer as a string.
Answers
Answer:
atagcca
Explanation:
t goes with a, and c goes with g
atagcca matches with
ta tcggt
How many lone pairs of electrons are in the ion OH⁻?
Answers
Explanation:
The ion OH⁻ consists of one oxygen atom (O) and one hydrogen atom (H), with an overall charge of -1 due to the extra electron.
To determine the number of lone pairs of electrons on the oxygen atom, we need to know its valence electron configuration. Oxygen has 6 valence electrons, and in the OH⁻ ion, it has gained one extra electron to form a single covalent bond with the hydrogen atom.
To form this bond, the oxygen atom uses two of its valence electrons, leaving it with four valence electrons that are not involved in bonding. These four valence electrons are arranged in two lone pairs of electrons around the oxygen atom.
Therefore, there are two lone pairs of electrons on the oxygen atom in the OH⁻ ion. The hydrogen atom does not have any lone pairs of electrons.