what is the molarity of a solution that contains 14.92 grams magnesium oxide (MgO) in 365ml of solution?
a. 1.01 molar solution
b. 1.52 molar solution
c. 11.2 molar solution
d. 87.2 molar solution
Answers
Answer:
a. 1.01 molar solution
Explanation:
Now we have to recall the formula;
n= CV
Where
n= number of moles of magnesium oxide
C= concentration of magnesium oxide solution = ???
V= volume of magnesium oxide solution= 365 ml
But;
n= m/M
Where;
m= given mass of magnesium oxide= 14.2 g
M= molar mass of magnesium oxide= 40.3044 g/mol
Substituting values;
14.2g/40.3044 g/mol = C×365/1000
0.3523= 0.365 C
C= 0.3523/0.365
C= 0.965
C= 1.00 molar (approx)
Answer:
Option A. 1.01 molar solution
Explanation:
Step 1:
Data obtained from the question. This include the following:
Mass of MgO = 14.92g
Volume of solution = 365mL
Molarity of solution =.?
Step 2:
Determination of the number of mole present in 14.92g of MgO.
This is illustrated below:
Mass of MgO = 14.92g
Molar mass of MgO = 24.3 + 16 = 40.3g/mol
Number of mole MgO =...?
Mole = Mass /Molar Mass
Number of mole of MgO = 14.92/40.3 = 0.370 mole
Step 3:
Determination of the molarity of the solution.
This can be obtained as follow:
Mole of MgO = 0.370 mole
Volume = 365mL = 365/1000 = 0.365L
Molarity =..?
Molarity = mole /Volume
Molarity = 0.370/0.365
Molarity = 1.01M
Related Questions
What would be the relative difference between the currents required by a 60 Watt light bulb and a 100 Watt light bulb? Assume that the voltage supplied to them is the same. (A common household wall outlet in the United States delivers 120 volts).
Answers
Answer:
The 100 watt light bulb gives more light then a 60 watt light bulb would give.
Explanation:
I did this question a while ago.
Answer: 40 watts
Explanation: There is an actual difference of 40 watts between 100 and 60 watts. Only about 60% of the current can be consumed by a 60-watt bulb. On the other hand, a 100-watt light bulb also ejects more light and heat in comparison with a 60-watt bulb.
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88
Complete the semence with the word element of compour
O is a(n)
and H₂02₂ is a(n)
Answers
Answer: 82 + 62 = h*2 so that would mean 35.
Explanation:
Please help im in a rush and im at therapy so i need to finish this
What is a mixture?
Answers
Answer:
In chemistry, a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Explanation:
I hope this helps. ^_^
Mixture
Explanation:
A mixture is created when two or more different substances are physically combined and can be separated back into its original substances.
example- a pile of different kinds of leaves
hope it helps!
What can scientists use to determine the relative order of events on the geologic timescale?
Answers
Answer:
Scientists use a geologic time scale to illustrate the order in which events on Earth have happened.
Explanation:
Scientists can use the geologic time scale to determine the order in which several events on Earth have happened or taken place.
What is a geologic timescale?The geologic time scale can be described as a representation of time based on the rock record of Earth and is a system of chronological dating that uses chronostratigraphy and geochronology.
The geologic time scale can be used by scientists to observe changes in the fossils by examing the oldest to youngest sedimentary rocks or layer by layer.
The geologic timescale also used relative dating to divide Earth’s past into many layers of time and utilized absolute dating to know the actual number of years ago that specific occurrences took place.
Relative dating does not show any specific dates but it allows us to know if a fossil or stratigraphic layer is older than another while Absolute dating methods provide more specific origin dates and timelines.
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A substance that is uniform in composition, made up of two or more atoms in the same place, and NOT chemically combined is a _______________.
element
homogeneous mixture
compound
heterogeneous mixture
Answers
Answer:
homogeneous mixture
Explanation:
from goigle
Where does most fresh water exist?
Answers
Answer:
aquifers, ice caps, and glaciers I think
(C) aquifers, ice caps and glaciers
Please help me I will give you the brain thing and extra points. image below part
Answers
Answer:
The answer is D, when H2S gas is bubbled into a lead acetate soulution, a precipitate forms
Explanation:
This is because a physical change is when it changes but doesn't turn into a new substance. A chemical change is when it transforms into a completly new substance. Hope this helps!!! :)
Describe how this instrument works.
Operation:
Answers
Answer:
It reflects light from one mirror to the second mirror so the second mirror reflects both the light and the image to the users eye.
Explanation:
This help you lol
the figure shows the great ocean conveyor belt. which best describes what this model represents?
A. The model shows how ocean currents change the salinity of water.
B. the model shows how ocean currents move heat energy around earth
C. the model shows how salinity of water affects its density
D. the model shows how the density of water differs between the north Atlantic and other parts of the ocean.
Answers
Answer:
d
Explanation:
The ocean conveyor belt shows the movement of the oceanic water and the salinity. The model represents the density of the water in different regions of the world. Thus, option d is correct.
What are ocean conveyor belts?Ocean conveyor belts are the oceanic current movement in their oceans across others and how the water moves across the water bodies across the globe.
The model shows that high salinity water gets heavy and sinks in the ocean of North Atlantic but the water of the Indian and the pacific oceans are less saline and remains at the surface.
Therefore, option D. the water differs in oceans based on density.
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is copper a renewable resource? explain your reasoning
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Imagine that you are a leaf on a plant, and you realize that you are running low on supplies to do your job. You decide to text the roots to set up a delivery. Write a text message conversation between the leaf and the roots that discusses and arranges this delivery.
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Answer:
Leaf: Hey Roots, this is Leaf. I'm running low on supplies here. Can you send some over?
Roots: Hey Leaf, of course. What kind of supplies do you need?
Leaf: I need more water and nutrients. Can you send some my way?
Roots: Sure thing, we'll get on it right away. How much do you need?
Leaf: Just enough to keep me going for a few more days. Can you also send some sunlight my way?
Roots: Sorry, we can't help with that one. But we'll make sure to send enough water and nutrients to help you out.
Leaf: Thanks, Roots. You're the best. Let me know when the delivery is on its way.
Roots: Will do, Leaf. Hang in there. Delivery should be there soon.
Roots: Hi Leaf! Of course, we're here to help. Sorry to hear you're running low. We'll get right on it. How much water and which specific nutrients do you need?
Hope it helps! :)
Leaf: Thanks, Roots! I'll need a good soak of water, and I could use some extra nitrogen and potassium for optimal photosynthesis. Can you also throw in some magnesium?
Roots: Noted, Leaf. Water, nitrogen, potassium, and magnesium coming right up! We'll absorb them from the soil and deliver them through the xylem. Just hang in there!
Leaf: Awesome, Roots! Your support is much appreciated. Let's make sure this delivery boosts my chlorophyll production so I can keep producing energy for the whole plant.
Roots: Absolutely, Leaf! We're here to keep the whole plant thriving. Your health is our priority. We'll work together to ensure you have everything you need for top-notch photosynthesis.
Leaf: Thanks for being the best roots a leaf could ask for! Can't wait to feel rejuvenated and get back to making food for the plant.
Roots: You're welcome, Leaf! We're all part of the same team. Stay patient, the delivery will be on its way soon. We'll keep you updated.
Leaf: Will do, Roots! Looking forward to the delivery. Keep up the great work down there!
Roots: Thanks, Leaf! We'll keep the nutrients flowing. Take care up there and keep shining!
Leaf: You too, Roots! Catch you later!
Roots: Until next time, Leaf! Stay green and healthy!
Which of the following is not one of the four environmental spheres in which all of the Earth’s physical and natural processes occur? A.atmosphere B.hemisphere C.lithosphere D.hydrosphere
Answers
Which of the following statements fully describes what an object may do when it experiences unbalanced forces? Select the two best answers.
A. It may change directions.
B. It will move at a constant speed.
C. It may slow down.
D. It may slow down or speed up.
E. It will stay stationary.
Answers
Answer:b
Explanation:
HELP HELP HELP MEH PLEASE ILL MARK BRAINLIEST
Classify each characteristic as either: Metals, NonMetals
Answers
Answer:
High luster- shiny: metals
Low luster- dull: non-metals
Is Ductile- can be pulled into thin wires: metals
Not ductile: non-metals
Not malleable- is brittle: non-metals
Is malleable- elements can be hammered into thin sheets: metals
Poor conductors of heat and electricity: non-metals
Good conductors of heat and electricity: metals
Located on the left side of the periodic table: metals
Located on the right side of the periodic table: non-metals
sorry if i got something wrong but i think this is all right
hope this helps :)
Answer:
High luster shiny is the characteristic of metals while low luster and dull is a non metal.
Metals are ductile because wires are made up of metals which is due to their ductility. non metals are not ductile.
Non metals are non melliable while metals are melliable
Non metals are poor conductor while metals are good conductor of heat and electricity.
Metals are located on the left side while non metals are located on right side of periodic table.
Explanation:
There is a large marble with a large amount of mass, including kinetic energy. Not too far from it, there's a small marble with a small amount of mass that stands still. The large marble moves towards it and collides with the small marble.
When the large marble collides with the small marble, is the large marble transferring kinetic energy to the small marble?
Answers
Answer:
Yes it is I think
Explanation:
A small gap is left between the rails in the railway track. Analyze the reason.
Answers
Answer:
There could be several possible reasons for a small gap between rails on a railway track, such as:
1. Expansion joints: Railways are designed to allow the tracks to expand and contract with changes in temperature. To accommodate this expansion, small gaps are left between the rail ends and filled with expansion joints or plates.
2. Wear and tear: Over time, the rails may experience wear and tear due to heavy loads, weather conditions, and other factors. As a result, small gaps can appear between the rails.
3. Maintenance: During maintenance activities, rail tracks may be adjusted or replaced, which could lead to small gaps between the rails.
4. Environmental factors: Environmental factors such as soil shifts, earthquakes or other natural disasters can also affect the alignment of the rails, leading to small gaps.
These are some of the possible reasons for a small gap between the rails on a railway track.
Answer:
The small gap left between the rails in a railway track is intentional and serves a specific purpose. This gap is known as the rail joint, and it allows for the expansion and contraction of the rails due to changes in temperature. When the temperature changes, the metal rails will expand or contract, and if they were joined together tightly, they could buckle or become deformed, which could be dangerous for trains passing over them. The rail joint allows the rails to move slightly and prevent damage to the track.
Additionally, the rail joint also allows for maintenance and repairs of the track. If there were no gap between the rails, it would be challenging to replace a damaged rail or perform routine maintenance, such as tightening bolts or lubricating joints. With the rail joint, maintenance personnel can easily access and work on the track.
Overall, the small gap left between the rails in a railway track is intentional and serves a crucial function in ensuring the safety and reliability of the track.
Which of the following was a major focus of the Mississippian belief system?
physical connection
an anointed leader
a single deity
spiritual connection
Answers
Answer:
i think answer is spiritual connection
The cells that form the lining of the stomach most likely form ______ since they produce secretions and protect the stomach.
Answers
Explanation:
GIVING BRAINLIEST TO WHOEVER HAS THE BEST ANSWERS! :D
1. Describe and explain all the possible energy transformations that occur with a dishwasher that uses electrical energy.
2. Discuss the different observations that you would record during an investigation into the energy transformations of a lamp that uses electrical energy.
Answers
Answer:
1. All the possible energy transformations that occur with a dishwasher that uses electrical energy are heat energy because the dishwasher uses the electrical energy to heat the water, also electrical energy is transformed into kinetic energy and sound energy the reasoning behind this is that the parts moving inside the dishwasher is causing the sound.
2. Take as an example a light bulb inside a lamp to illuminate a room. When you plug it in a plug and turn it on, light is generated. More precisely, heat (Joule effect) is produced inside the lamp by its internal filament (conductive material) when it passes through the electrical energy, generated by the friction of the atoms that are inside it when it encounters a resistance.
Explanation:
Pls mark as brainliest i really need it
please solve this for me
Answers
The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.
For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.
A voltaic cell, also known as a galvanic cell or an electrochemical cell, is an electrochemical device that generates electrical energy through a spontaneous chemical reaction. It consists of two half-cells connected by an external circuit and a salt bridge or porous barrier that allows the flow of ions between the two half-cells.
Each half-cell consists of an electrode immersed in an electrolyte solution. The electrode is typically made of a metal or a conductive material, and the electrolyte is a solution containing ions that can participate in the redox (reduction-oxidation) reaction.
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Answer:
The standard reduction potential for the half-reaction of Be^2+ + 2e^- -> Be is given as E^0 = 3.83 V.For the half-cell Hg^2+ | Hg, the standard reduction potential is not provided in the given information. To calculate the electric potential for the voltaic cell, we need the reduction potential for the Hg^2+ | Hg half-cell.
Which object has the most kinetic energy?
A. a train that is stopped
B. a car moving at a slow speed
C. a train moving at a slow speed
D. a car that is stopped at the top of a hill
Answers
Explanation: kinetic energy means that the object is moving, automatically eliminating A and D since they are both stopped. The formula for kinetic energy is KE=1/2m(v^2) (m= mass and v= velocity). Since the train has more mass than the car, the train has more kinetic energy.
help me with these questions pls thanks :)
Answers
Answer:
1. 2 valence electrons 2. 1 valence electron
Explanation:
valence shell is the elctrons present on the outer most shell
2. 1 valence electron
3. 8 valence electrons
Valence electrons are the ones on the very outside ring. Hope this helps!
How is a zygote formed?
Answers
Answer:
A zygote is formed from the process of reproduction. The zygote is officially formed when the sperm meets the egg within the fallopian tube, which then creates a fertilized egg.
Explanation:
Answer:
During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.
Explanation:
Or
zygote, fertilized egg is a cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm)
Information obtained from experiments must be:
Recorded
Previously known
Memorized
Answers
Answer:
Recorded
Explanation:
If you don't record your information you may need to prove your work and you might forget it!
How does an atom change if all of its electrons are removed?
p.s. I'll mark the first answer the brainliest if it is correct! ;)
a. The atom’s volume increases.
b. The atom’s mass increases.
c. The atom becomes positively charged.
d. The atom becomes negatively charged.
Answers
c. The atom becomes positively charged
if the electrons are removed it means theres no longer a negative charge to balance the positive charge of the protons in the atom
Which element is represented by this model?
Be; Beryllium
N; Nitrogen
C; Carbon
F: Fluorine
Answers
Answer: C; Carbon
Explanation: The model is showing it has 6 electrons, 6 protons, and 6 neutrons. Therefore the element, carbon.
Answer:
Carbon
Ok it needs more characters
Please help asap! Thanks♡♡!
Answers
B- boron
O- oxygen
Au- gold
Co- cobalt
He- helium
Na- sodium
S- sulfur
K- potassium
Ag - silver
Answer:
1. H - F. (Hydrogen)
2. B - G. (Boron)
3. O - J. (Oxygen)
4. Au - C. (Gold)
5. Co - I. (Cobalt)
6. He - D. (Helium)
7. Na - H. (Sodium)
8. S - A. (Sulfur)
9. K - E. (Potassium)
10. Ag - B. (Silver)
Explanation:
In order to match these together, look at the periodic table and look for the given symbols and their names.
Once you have the PT with you, find the symbols asked and the name of the element should be right below it.
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objectives(s):
In your own words, what is the purpose of this lab?
Hypothesis:
In this section, please include the predictions you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the elements present in each unknown astronomical object. Be sure to indicate “yes” or “no” for each element.
Hydrogen Helium Lithium Sodium Carbon Nitrogen
Moon One
Moon Two
Planet One
Planet Two
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab.
Astronomers use a wide variety of technology to explore space and the electromagnetic spectrum; why do you believe it is essential to use many types of equipment when studying space?
If carbon was the most common element found in the moons and planets, what element is missing that would make them similar to Earth? Explain why. (Hint: Think about the carbon cycle.)
We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars?
Why might it be useful to determine the elements that a planet or moon is made up of?
Answers
Help RRLY EASY I JUST DONT UNDERSTAND
Answers
Answer:
boomer
Explanation:
Why are most plants that grow in the tundra small with thin, wax-covered leaves?
The plants need to be able to grow in sandy soil.
The plants need to be able to grow in sandy soil.
The plants need to survive the hot temperatures in the summer.
The plants need to survive the hot temperatures in the summer.
The plants need to survive the year-round dry conditions.
The plants need to survive the year-round dry conditions.
The plants need to be able to grow in the moist, humid air.
Answers
Answer:
The answer is (The plant needs to be able to grow in sandy soil, survive in hot temperatures, and year round conditions.)
Explanation:
If you have any questions please ask me! :)