Answer:
91.60 grams
Explanation:
For this specific problem, you are asked to find the weight of an element, when given moles. Other problems could give you a compound. In each case, you need to find the molar mass of the element or compound, that is, the weight (in grams) of 1 mole of the element or compound. Now that you know the molar mass of the element/compound, you can multiply by the amount of moles the equation the equation gives you to find the total weight.
In this problem, you are asked to find the mass of Sodium (Na). First, we need to look on the Periodic Table to find the Atomic Mass of Sodium. If we look, we find this to be 22.990 amu. Side note - when we find molar mass, amu and grams are interchangeable - you'll see here. This 22.990 amu is also the molar mass in GRAMS of 1 mole of sodium. The equation asks us to find the mass of 4 moles of sodium, so now we simply multiply by 4. 22.990 * 4 = 91.60 grams.
In summary, find the molar mass (1 mole) of the substance, by adding the amu's of each element (keeping mind the amount of each). Then, multiply this total number by the amount of moles that is given, and put your answer in moles.
Hope this helps
Which substance gives heat and light after combustion?
Answer:
Magnesium oxide
Explanation:
The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.
6. The following reaction occurs under standard conditions:
CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
a. Which bonds are broken and which are formed during the reaction? (1 point)
b. Determine the enthalpy of the reaction. (2 points)
Answer:
a. CH4 → CO2 and H20
O2 → CO2 and H20
b. -890 kJ
Explanation:
As you move across the periodic table, from left to right, atoms tend to get smaller
because,
(0.5 Points)
they have more mass
they have less mass
they have more protons.
they have less electrons.
Explanation:
because they have more protons
In a school’s laboratory, students require 50.0 ml of 2.50 m h2so4 for an experiment, but the only available stock solution of the acid has a concentration of 18.0 m. what volume of the stock solution would they use to make the required solution? use m subscript i v subscript i equals m subscript f v subscript f.. 0.900 ml 1.11 ml 6.94 ml 7.20 ml
The volume of stock solution they use to make the required solution is 6.94mL.
How we calculate the volume?To calculate the value of required volume we will use the below equation:
M₁V₁ = M₂V₂, where
M₁ = molarity of stock solution = 18M
V₁ = volume of stock solution = to find?
M₂ = molarity of H₂SO₄ solution = 2.50M
V₂ = volume of H₂SO₄ solution = 50mL
On putting all these values on the above equation and calculate for the value of V₁ as:
V₁ = (2.50)(50) / (18)
V₁ = 6.94mL
Hence correct option is (3) i.e. 6.94mL.
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Answer:
C. 6.94 mL
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
A particle that gains electron is called a cation
true or false
TRUE. BECAUSE : When an atom gains electrons (which are negatively charge), the ion formed is negatively charged and is called an anion. If an atom loses electrons, the ion formed in positively charged and is called a cation.
answer correct
urgent
Answer:
i don't understand let us know which one you want us to answer
An allele that is not dominant is know as what
Answer:
Recessive
Explanation:
Hope this help I think this is the right answer.
can someone help with homework anyone? right now its science...
Answer:
Organ
Explanation:
Cells work together to make tissues, tissues work together to make organs, organs works together to make the organ system, and the organ system works to help the organism stay alive and do all of the physical stuff._.
a gas occupies 3.5 L at standard pressure. find the volume of the gas when the pressure is 1.5 atm
Answer:
5.25 lit
Explanation:
[tex]standard \: pressure = 1atm[/tex]
[tex] \frac{3.5lit}{1atm} = \frac{x}{1.5atm} [/tex]
[tex]x = 5.25lit[/tex]
Which kind of wave is created by moving a spring toy up and down?
electromagnetic
longitudinal
transverse
surface
Answer:
Transverse!
Explanation:
Transverse is a more direct moving wave
The wave which is generated by moving a spring toy up and down is transverse wave. An electromagnetic wave is a transverse wave. The correct option is C.
What is transverse wave?A transverse wave is a progressive wave. The direction of propagation of a transverse wave is always perpendicular to its direction of vibration. They are non-mechanical waves which do not need a medium for propagation and they consists of crests and troughs.
When a toy spring is moved up and down, the generating waves that propagate in the horizontal direction while disturbing the toy spring in the vertical direction. In physics transverse wave is considered as a moving wave where oscillations are perpendicular to the direction of the wave.
The transverse waves are found commonly in elastic solids, oscillations, etc. The waves generated by moving a spring toy up and down is transverse wave.
Thus the correct option is C.
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When can a metal replace another metal in a single displacement reaction?
Only if the metal replacing it is isoelectronic with the metal that is being replaced.
When it is larger in atomic mass.
Any element can always replace another element.
When it is more reactive according to the reactivity series.
Answer:
When it is more reactive according to the reactivity series.
Explanation:
How does benzene react with concentrated sulfuric acid?
Benzene reacts with concentrated sulfuric acid to form benzene sulfonic acid .
The reaction attached
Answer:
See below ~
Explanation:
I need help on this question
Answer:
The way its parts are arranged
Explanation:
The Steller sea lion population has been decreasing in parts of Alaska. New evidence suggests that Steller sea lions need herring as a part of their diet in order to survive. Pollock, another type of fish, also feed on herring. Which would most likely help the Steller sea lion population to increase?
Answer:
Improving the habitats of herring thereby increasing their population.
Explanation:
First, two consumers (Steller sea lion and Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.
The Steller sea lion population would increase if:
1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.
2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.
What is the purpose of the flame that is lit below a hot air balloon?
A. To decrease enthalpy
B. To decrease specific impulse
C. To increase enthalpy
D. To increase reduction
Answer:
A. To increase enthalpy
Explanation:
Because the burner is the engine of the hot air balloon it is what propels the hot air up into the envelope to make the balloon rise
I WILL MARK BRAINLYEST!
What are two things that the DDT and ozone story have in common?
there's no answer options I just need sentences please!
Answer:
DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.
Ozone is a naturally occurring molecule. An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.
Explanation:
It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.
How is the kinetic energy of the particles that make up a substance different
after it changes state?
A. The kinetic energy is less after a substance changes from a liquid
to a gas.
OB. The kinetic energy is less after a substance changes from a gas to
a plasma
C. The kinetic energy is greater after a substance changes from a
liquid to a solid
D. The kinetic energy is greater after a substance changes from a
solid to a liquid.
Answer:
D. The kinetic energy is greater after a substance changes from a
solid to a liquid
Explanation:
During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.
Kinetic energy is the energy accrued due to the motion of a body. In a melting process where solids turn to liquid, there is an increase in kinetic energy. When randomness of a system increase, kinetic energy also increases. From liquid to gas and gas to plasma increases kinetic energy. In the other way round, the kinetic energy reduces.Answer:
D. The kinetic energy is greater after a substance changes from a solid to a liquid
Explanation:
Does the size of the rock affect how fast a rock can be weathered?
Answer:
Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. However, if a rock has a large volume as well as a large surface area, it takes longer for the rock to wear down.
Explanation:
Given 3.50 mol of CH4, how many grams of Oz are required to completely react with all the CH4 CHP CH. + 20% CO2 - 2H2O 1
Answer:
2.7
Explanation:
What is the density of aluminum chloride vapor (AlCl3) at 498 K and 0.939 atm?
1.24 g/L
3.06 g/L
5.17 g/L
7.42 g/L
Answer:
3.06 g/L
Explanation:
Taking into account the definition of density and ideal gas law, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
DensityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
Ideal gas lawIdeal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Density of aluminum chloride vaporFrom the Ideal gas law, you can get that:
[tex]\frac{n}{V} =\frac{P}{RxT}[/tex]
On the other side, the molar mass of substance is a property defined as the amount of mass that a substance contains in one mole. It can be expressed as:
[tex]molar mass= \frac{mass}{number of moles}[/tex]
Then, the number of moles n can be calculated as:
[tex]n=\frac{mass}{molar mass}[/tex]
So:
[tex]\frac{\frac{mass}{molar mass} }{V} =\frac{P}{RxT}[/tex]
Solving you get the expression:
[tex]\frac{mass }{V} =\frac{Pxmolar mass}{RxT}[/tex]
Considering the definition of density, you finally get:
[tex]density=\frac{Pxmolar mass}{RxT}[/tex]
In this case, you know:
P= 0.939 atmmolar mass of AlCl₃= 133.35 [tex]\frac{g}{mol}[/tex]R= 0.082[tex]\frac{atm L}{molK}[/tex]T= 498 KReplacing in the previous expression for the calculation of the density:
[tex]density=\frac{0.939 atmx133.35\frac{g}{mol} }{0.082\frac{atm L}{molK} x498 K}[/tex]
and solving you get:
density= 3.06 g/L
Finally, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.
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The tallest building in the world, the burj khalifa in Dubai, is 0.828 kilometers high. What is the building height in centimeters
Which are indicators that a chemical change has occurred? Check all that apply. change in odor change in shape change in energy change in color change in size o formation of a precipitate
Color change, formation of a precipitate, formation of a gas, odor change, temperature change is the correct answer
What is Chemical Indicator ?
Chemical indicators are substances that change color in response to changes in a chemical environment, such as changes in pH, temperature, or the presence of certain ions. They are commonly used in a variety of applications, such as quality control in manufacturing, medical diagnostics, and laboratory research. There are many different types of chemical indicators, including pH indicators, which change color in response to changes in the acidity or alkalinity of a solution, and redox indicators, which change color in response to changes in the oxidation state of a substance.
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Answer:
they're all right
Explanation:
on edge
Dalton's Atomic Theory explains many well-established scientific laws including all of these except the
A. Law of Conservation of Mass.
B. Law of Definite Composition.
C. Law of Multiple Proportions.
D. Periodic Law.
Dalton's Atomic Theory explains many well-established scientific laws, including all of these except the law of Conservation of Mass. The correct option is A.
What is Dalton's Atomic Theory?According to the second component of the theory, the mass, and characteristics of every atom in a specific element are the same. Compounds, according to the third section, are combinations of two or more different kinds of atoms.
Dalton's theory thus recognized that all matter is made up of atoms, which is accurate, but it did not recognize the presence of smaller particles within atoms, which is wrong.
Dalton's theory, which claimed that atoms could not interact with one another, is erroneous because compounds are created by the fusion of two or more different kinds of atoms.
Therefore, the correct option is A. Law of Conservation of Mass.
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What is the muddy water if the mud in muddy water eventually settles out?.
it will become a solution.hope this helps!
suggest why the copper sulfate solution was left for four minutes before adding the magnesium
please help
Copper is unable to displace magnessium in a reaction so the copper sulfate solution was left for four minutes before adding the magnesium.
The electrochemical seriesThe electrochemical series shows the order of reactivity of the metals. The metals that are higher in the series can displace the metals that are lower in the series in a chemical reaction.
We know that copper is unable to displace magnessium in a reaction hence the reaction can not occur in the reverse direction. Hence, the copper sulfate solution was left for four minutes before adding the magnesium.
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60 points! please help me i will appreciate it!
The relative atomic mass of copper is 63.5. Explain why this value is not a whole number
This answer is not a whole number due to the fact that it is a decimal form.
A whole number would be 635, it would not be 63.5. Therefore this number is not whole.
4. Which type of fault does NOT cause
earthquakes?
A normal
B parallel
C reverse
D strike-slip
Answer:
Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults, normal earthquakes occur on normal faults, and thrust earthquakes occur on thrust or reverse faults. I hope this helps you :)
How many moles of Al2O3 [Aluminum oxide] is in 40g sample
Answer:
0.39 is the answer!
The mobile electrons of a pure metal are
called what
Answer:
This means that the metal is more properly viewed as an array of positive ions surrounded by a “sea of mobile valence electrons.” Electrons which are capable of moving freely throughout the empty orbitals of the metallic crystal are called delocalized electrons (Figure below).