The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2).
4Al + 3O2 2Al2O3
The molar mass of O2 is 32.0 g/mol. What mass, in grams, of O2 must react to form 3.80 mol of Al2O3?
60.8
81.1
122
182
Answer:
Mass = 182.4 g
Explanation:
Given data:
Number of moles of Al₂O₃ = 3.80 mol
Mass of oxygen required = ?
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Now we will compare the moles of aluminum oxide and oxygen.
Al₂O₃ : O₂
2 : 3
3.80 : 3/2×3.80 = 5.7
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 5.7 mol × 32 g/mol
Mass = 182.4 g
The time it takes the Moon to go from new moon to full moon and back to new moon is about
Answer:
it takes about 29.5 days for the moon to complete a cycle
What volume (in L) of nitrogen monoxide will be
required to produce 54.5 L of carbon dioxide in
the reaction below?
2CO(g) + 2NO(g) → N2(g) + 2CO2(g)
Answer:
54.5 L of nitrogen monoxide, NO.
Explanation:
The balanced equation for the reaction is given below:
2CO + 2NO —> N₂ + 2CO₂
From the balanced equation above,
2 L of NO reacted to produce 2 L of CO₂.
Finally, we shall determine the volume of nitrogen monoxide, NO, required to produce 54.5 L of carbon dioxide, CO₂. This can be obtained as follow:
From the balanced equation above,
2 L of NO reacted to produce 2 L of CO₂.
Therefore, 54.5 L of NO will also react to produce 54.5 L of CO₂.
Thus, 54.5 L of nitrogen monoxide, NO, is needed for the reaction.
Answer:
54.5
Explanation:
Even before modern observations provided evidence supporting the theory of plate tectonics, people developed theories that the continents were once joined together. Using only maps, what did they observe?
Answer:
people or scientist tend to observe the nature of the continents that described by jigsaw fit,geological similarity among the continents
If you have 3.62 moles of Tin (Sn), how many grams do you have?
a
.031 grams
b
118.711 grams
c
32.79 grams
d
429.73 grams
Answer:
D.) 429.73 grams
Explanation:
number of moles x molar mass= mass in grams
3.62 x 118.71= 429.73 grams
which type of wind is responsible for moving state to state
Which substance can be decomposed by a chemical change?
A. Sodium, Na
B.Sulfur, s
C. Calcium Chloride, CaCl2
D.Argon, Ar
Answer:
It could be C. Calcuim Chloride.
Explanation:
what volume of carbon 4 oxide measured at STP will produce when 21 gram of sodium hydrogen carbonate for is completely decomposed accor. ding to the equation. (Na=23. H=1 C=12 O=16) molar vol =22.4dmcube. pleeeeeeeeeeese help,
The volume of CO₂ at STP = 2.8 L
Further explanationGiven
21 gram of sodium hydrogen carbonate-NaHCO₃
Required
Volume of CO₂
Solution
The decomposition of sodium bicarbonate into sodium carbonate, carbon dioxide, and water :
2 NaHCO₃(s) → Na₂CO₃(s) + CO₂(g) + H₂O(g)
mol of NaHCO₃ :
= mass : MW NaHCO₃
= 21 g : 84 g/mol
= 0.25
From the equation, mol ratio of NaHCO₃(s) :CO₂(g) = 2 : 1, so mol CO₂ :
= 1/2 x mol NaHCO₃
= 1/2 x 0.25
= 0.125
At STP, 1 mol gas = 22.4 L, so for 0.125 mol :
= 0.125 x 22.4 L
= 2.8 L
show work on how you converted them. (also marking brainliest) <3
explanation for qn:
when converting units, u can show your working in the form
37.5 × 1g/1ml, then convert the g and ml into 1/1000 kg and L, and calculate from there. In the end, u find out its actually a trick qn and 1g/ml = 1 kg/L
200mL of 12.0M HNO3 is prepared from stock solution of 16.0M HNO3. A,What volume of stock solution of NH3 is used? And b, What volume of water should be added to the stock
Answer:
a. 150mL of the stock solution was added
b. 50mL of water was added
Explanation:
The solution was diluted from 16.0M to 12.0M, that is:
16.0M / 12.0M = 1.333 times was diluted.
As the volume of the diluted solution is 200mL, the amount of the 16.0M stock solution is:
200mL / 1.333 =
a. 150mL of the stock solution was addedAs the volume of the solution is 200mL and 150mL were added of the stock solution, the volume of water is:
200mL - 150mL =
b. 50mL of water was addedWhich sample contains a total of 6.0 x 1023 particles?
Answer: 6,138
:)
Explanation:
With pollution on the rise, and demand for fresh water increasing, world leaders are concerned that in the future many people will not have access to clean drinking water. Select the statement that best describes the long-term global effects of this behavior.
People do not need to be concerned because there is an unlimited supply of fresh water on the Earth so we will never run out.
Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.
The Earth is getting warmer and if all the ice melts the sea level will rise and we will have more fresh water.
There will always be enough fresh water because the Earth is about 75% water and it surrounds every continent.
Fresh water is a limited resource. If we pollute the fresh water we have, there will be a shortage of clean drinking water in the future.
Calculate the weight of the rocks in the photo. The measurement from the scale is given in the caption. (textbook page 8 picture next to question 7) This is what it says on caption: m=0.5 kg Formula: F= m x a force (F), mass (m), acceleration (a) Formula: F= _____kg x 9.8 m/s^2 Answer: F= _____ kg x m/s^2 Type your answer answer:
Answer:
The correct answer is - 4.9 kg x m/s^2.
Explanation:
The weight of any object is the mass of the object in specific gravity applied to the object. It can be represented by the F=ma where F is the force applied on the earth by the gravity (a) and mass of the object (m).
Solution:
F = ma
F = 0.5*9.8 kg x m/s^2.
= 4.9 kg x m/s^2.
What has occurred?
an endothermic reaction
an energy formation
a chemical reaction
a precipitate formation
The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material.
Answer:
a chemical reaction
Explanation:
What has happened to the statue of liberty is that a chemical reaction has occurred to the materials making up this edifice.
The statue is made up of copper. On reacting with oxygen, it undergoes an oxidation.
This makes the copper to rust and decolorize.
It implies that copper has reacted with oxygen in air and possibly from water.
This gives a new product.
We know this because for most chemical changes, they give new products and are not easily reversible.
Regan has an empty glass cup. It has a mass of 0.3 kg. She drops the cup on the ground and it shatters into several pieces. If she collected all of the pieces of the cup, how much mass would all of the pieces have combined?
A.
There is no way to determine the mass of the shattered glass.
B.
more than 0.3 kg
C.
less than 0.3 kg
D.
exactly 0.3 kg
Answer:
743456478697
Explanation:
Answer:
Exactly 0.3 kg
Explanation:
This is the right answer
Which electron configuration could represent the electrons in a sodium atom in an excited state?
(1) 2-8
(2) 2-8-17
(3) 2-7-1
(4) 2-7-2
Answer:
2-7-2
Explanation:
Elements in which their valence atoms takes up higher energy orbitals compared to the ground state are said to be in an excited state. Hence, sodium atom in an excited state could have the electronic configuration 2 - 7 - 2
The number of atoms in sodium is 11. Hence, a ground state sodium would have the configuration ; 2, 8, 1 In an excited state, the outer shell could have more than 1 atom such as 2, 7, 2 ; with two atoms taking up the higher orbital instead of 1.Therefore, a possible representation of sodium atom in an excited state is 2 - 7 - 2.
Learn more :https://brainly.com/question/2256095
What is the working of fuse ?
Answer:
The interpretation of the frame of reference in question is demonstrated below.
Explanation:
The fuses operate on the assumptions including its heating temperature increase of the power supply. It consists of a single layer strip as well as a tangle of a metal rod or wire with such an, especially non-substance. These were directly linked to the finishes of that same access points. Fuse has always been hooked up to an electrical sequence connection.
how does air pressure changes with altitude - the distance from the surface
Answer:At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. ... Since more than half of the atmosphere's molecules are located below an altitude of 5.5 km, atmospheric pressure decreases roughly 50% (to around 500 mb) within the lowest 5.5 km.
Explanation:brainliest plz
Answer:
What is that?
Explanation:
Mass = ?
Acceleration = 10 m/s2
Force = 20 N
I NEED HELP ASAP!!!
If a person is sterile, he or she is:
unable to reproduce
unable to complete meiosis
unable to complete a Punnett square
unable to complete mitosis
Answer:
1
Explanation:
Sterile means sperm or eggs are not able to Technichaly Create or produce.
If the height that an object is dropped is increased, the object will bounce higher and therefore have
Answer:
Greater impact
Explanation:
Not only will it have a greater impact, but it will also have a greater risk of permanently deforming since the impact force can overcome the elastic modulus of the material and thus suffer permanent damage.
How many atoms of oxygen are in 0.400 moles of N205?
Answer:
0.400 mol N2O5 contains 2.41 molecules N2O5 .
Explanation:
does lithium lose or gain valence electrons? and how much?
Why don't the noble gases (group 18) bond with any other elements? *
Why does alcohol evaporate faster than water? *
1.Alcohol evaporates faster than water because alcohol molecules are hotter
2.Alcohol evaporates faster than water because alcohol molecules are not as attracted
to each other as water molecules are
3.Alcohol evaporates faster than water because alcohol molecules are more attracted
to each other than water molecules are (Which one I need help)
Answer:
Number oneExplanation:
Alcohol has a lower boiling point than water. Water boils at 100 degrees Celsius (212 degrees Fahrenheit), while Alcohol boils at 82 degrees Celsius (179.6 degrees Fahrenheit).Because sound is energy created by vibrations, through which medium will it move the fastest?
A) gas
B) liquid
C) solid
D) vacuum
Answer:
C - solid
Explanation:
Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air.
Answer:
c solid
Explanation:
True or false: the smaller the difference between the average experimental value and the correct (true) value the greater the accuracy
Answer:
True
Explanation:
The accuracy level is usually determined by the difference between the experimental and correct value. It is important to note that the smaller the difference between the average experimental value and the correct (true) value, the more accurate it is.
When the difference is large then it means the accuracy level is low and not up to the required standard.
A water skier is pulled by a net force of 165 N and has an acceleration of 2.2 m/s2. What is the mass of the skier?
A.
75 kg
B.
66 kg
C.
85 kg
D.
65 kg
Why the molecular formula of calcium carbide is cac2 but not ca2c
Answer:
The two carbons have a triple bond leaving two unpaired electrons which take the two calcium electrons to form the acetylide ion (C2–2) and the Ca+2 ion. The C-4 ion is not a stable species.
Help me with this pls
Answer:
the first three are the correct answer
