What is the percent composition of oxygen in Iron(III) oxide? (Round to three sig figs)
Fe2O3 159.7g/mol
Fe =55.85 x 2 =111.7 g/mol
O = 16.00 x 3 = 48.00 g/mol
____% O
Answers
30.1%
do not ask why it just is.
Related Questions
How many moles of water are contained in 0.250 mole
of CuSO4.5H2O?
A) 1.25 B) 4.50 C) 40.0 D) 62.5
Answers
Answer:
C. 40
Explanation:
there are 40 moles of water in a 0.250 mole. use the formula to find out
40.0 = 40.0 + 0
of CuSO4.5H2O?
A) 1.25 B) 4.50 C) 40.0 D) 62.5
c ( 40
The change in water from the solid ice to a liquid is an example of a
Answers
Answer:
When solid ice gains heat, it changes state from solid ice to liquid water in a process called melting. Ice cubes in a cold drink, for example, gradually melt. This process is called evaporation. Water vapor (steam) mixes with the air and seems to disappear.
Answer:
melting
when solid ice gains heat, it changes state from solid ice to liquid water in a process called melting
this is correct answer
I hope it's helpful for u ...
In ADEF, the measure of F=90°, the measure of ZD=10, and EF = 94 feet. Find the
length of DE to the nearest tenth of a foot.
Answers
Answer:
answer. the measure. is f=90 the equbaliint is 180
Explanation:
yan ang sagot ko
How does moving water help shape earth?
Answers
Answer:
Moving water helps plant's and islands form and grow. Which shapes earth.
this is the work
I'm rlly confused what should I write?
Answers
Answer:
Q 1: Why did the man get sick but not his children? Why did he use a cube?
Q 2: By knowing how he heated the water and everything we can infer what happened to him and not his children.
Explanation:
Hope this helps! plz mark brainliest <3
Answer:
Ill just comment this for fun So he can get brainliest since u need 2 comments for that
6) Which type of orbital is represented by this image?"
Z,Y,X
Answers
Answer:
the immage is not uploaded
The theoretical yield of a reaction is 44 g. The actual yield was 34 g. What is the percent
yield?
Answers
Answer:
77%
Explanation:
percent yield is the actual yield divided by the theoretical (predicted) yield, then multiplied by 100 to get a percentage.
34/44 = 0.77
0.77 x 100 = 77%
Calculate the pH during the titration of 20.00 mL of 0.1000 M HNO2(aq) with 0.1000 M KOH(aq) after 13.27 mL of the base have been added. Ka of nitrous acid = 7.1 x 10-4.
Answers
Answer:
pH = 2.462.
Explanation:
Hello there!
In this case, according to the reaction between nitrous acid and potassium hydroxide:
[tex]HNO_2+KOH\rightarrow KNO_2+H_2O[/tex]
It is possible to compute the moles of each reactant given their concentrations and volumes:
[tex]n_{HNO_2}=0.02000L*0.1000mol/L=2.000x10^{-3}mol\\\\n_{KOH}=0.1000mol/L*0.01327L=1.327x10^{-3}mol[/tex]
Thus, the resulting moles of nitrous acid after the reaction are:
[tex]n_{HNO_2}=2.000x10^{-3}mol-1.327x10^{-3}mol=6.73x10^{-4}mol[/tex]
So the resulting concentration considering the final volume (20.00mL+13.27mL) is:
[tex][HNO_2]=\frac{6.73x10^{-4}mol}{0.01327L+0.02000L} =0.02023M[/tex]
In such a way, we can write the ionization of this weak acid to obtain:
[tex]HNO_2+H_2O\rightleftharpoons NO_2^-+H_3O^+[/tex]
So we can set up its equilibrium expression to obtain x as the concentration of H3O+:
[tex]Ka=\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\\\\7.1x10^{-4}=\frac{x^2}{0.02023M-x}[/tex]
Next, by solving for the two roots of x, we get:
[tex]x_1=-0.004161M\\\\x_2=0.003451M[/tex]
Whereas the correct value is 0.003451 M. Finally, we compute the resulting pH:
[tex]pH=-log(0.003451)\\\\pH=2.462[/tex]
Best regards!
Revise this statement to make it true:
Running water makes rock edges very sharp and pointy.
NEED HELP NOW PLEASE!! WHOEVER ANSWERS FIRST GETS BRAINIEST!!! No links or I’m reporting your answer.
Answers
Answer:
Running water makes rock edges very dull because of erosion.
Explanation:
hope this helps ^_^
What is the total number of grams of solute in 500 milliliters of 1M CH3COOH (formula mass = 60)?
Answers
Answer:
30 grams
Explanation:
Molarity of a solution represents its molar concentration, and can be calculated by using the formula as follows:
Molarity (M) = number of moles (n) ÷ volume (V)
Based on the information provided, volume of solution = 500 milliliters, molarity = 1M
Volume of solution in liters = 500mL ÷ 1000 = 0.50L
Molarity = n/V
1 = n/0.50
n = 0.50moles
Using mole = mass/molar mass
Molar mass of CH3COOH (acetic acid) = 60g/mol
Mass = mole × molar mass
mass = 0.50 × 60
mass = 30 grams.
what is the function of a prism
Answers
Answer:
Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. If light inside the prism hits one of the surfaces at a sufficiently steep angle, total internal reflection occurs and all of the light is reflected.
Explanation:
Prism, in optics, piece of glass or other transparent material cut with precise angles and plane faces, useful for analyzing and reflecting light. An ordinary triangular prism can separate white light into its constituent colours, called a spectrum.
Explain how an aqueous acidic solution differs from an aqueous basic solution according to the Arrhenius theory for acids and bases
Answers
Answer:
An Arrhenius acid is a substance that associates in water to form hydrogen irons (H+) In other words an acid increases the concentration of H+ ions in an aqueous solution
Plants are living organisms that respond to stimuli, use resources for energy, grow and develop, are organized by cells, and reproduce. A. true B. false
Answers
Answer:
true
Explanation:
Answer:
b. trueeeeeeeeeeeeeeeeeeeeeeeeeeee
helpppppppppppppp!!!!!!!!!!!!!how did chlorine atom attain saturation in potassium chloride and oxygen dichloride
Answers
Determine if the following would be a buffer system.
H3PO4 and NaH2PO4
H3PO4 and Na2HPO4
Answers
sorry i dont know Explanation:
What is the diameter of Neptune in standard notation and scientific notion?
Answers
Answer:
Standard notation: 49,244 km
Scientific notation: 4.92x10⁴ km
Explanation:
The diameter of Neptune in standard notation is:
49,244 km
In the standard notation, we write the result in a normal way.
Now, to express the diameter in scientific notation we need to use a base ten power as follows:
4.92x10⁴ km
In the above result, the positive exponent indicates that the number is larger. The decimal point is located near the first digit.
Therefore, the diameter of Neptune in standard notation is 49,244 km and in scientific notation is 4.92x10⁴ km.
I hope it helps you!
Which of the following describes experiences initiated spontaneously by children as they go about their daily activities?
Naturalistic experiences
Informal learning experiences
Structured learning experiences
Disorganized experiences
Answers
Answer:
naturalistic
Explanation:
Briefly describe each of the suns layers. I’ll give brainless
Answers
Answer: The inner layers are the Core, Radiative Zone and Convection Zone.
The outer layers are the Photosphere, the Chromosphere, the Transition Region and the Corona.
Nuclear fusion of hydrogen in the core of the Sun produces tremendous amounts of energy that radiate out from the Sun.
The corona is the outermost layer of the Sun, starting at about 1300 miles (2100 km) above the solar surface (the photosphere). The temperature in the corona is 500,000 K (900,000 degrees F, 500,000 degrees C) or more.
The chromosphere is a layer in the Sun between about 250 miles (400 km) and 1300 miles (2100 km) above the solar surface (the photosphere). The temperature in the chromosphere varies between about 4000 K at the bottom (the so-called temperature minimum) and 8000 K at the top (6700 and 14,000 degrees F, 3700 and 7700 degrees C), so in this layer (and higher layers) it actually gets hotter if you go further away from the Sun, unlike in the lower layers, where it gets hotter if you go closer to the center of the Sun.
The photosphere is the deepest layer of the Sun that we can observe directly. It reaches from the surface visible at the center of the solar disk to about 250 miles (400 km) above that. The temperature in the photosphere varies between about 6500 K at the bottom and 4000 K at the top (11,000 and 6700 degrees F, 6200 and 3700 degrees C)
(phew! There you go!)
in general how are natural resources and population size related
Answers
Answer:
The magnitude of the threat to the ecosystem is linked to human population size and resource use per person. Resource use, waste production and environmental degradation are accelerated by population growth.
When dissolved in water, all aclds will
Answers
Answer:
when dissolved in water they dissociate in anion and H+ cation.
Explanation:
When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge. Bases, on the other hand, mixed with water yield hydroxide ions (OH-).
Describe the region(s) of the Atlantic Oceans where dense waters will likely sink/
Answers
Answer:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Explanation:
The densest ocean water is formed in two primary locations near the poles, where the water is very cold and highly saline as a result of ice formation. The densest deep water mass is formed in the Weddell Sea of Antarctica, and becomes the Antarctic Bottom Water (AABW).
Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
What is density?Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.
Mathematically,
Density = Mass of the metal ball ÷volume marked on the graduated cylinder
North Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink. Here, water is very cold and salty which makes the water denser.
Therefore, north Atlantic Ocean is the region of Atlantic Oceans where dense waters will likely sink.
To know more about density, here:
https://brainly.com/question/16894337
#SPJ2
Which organism is at the base of a marine food web?
A. Crab
B. Phytoplankton
C. Whale
D. Zooplankton
Answers
Dont click on the link
pleaseeeeeeeeeee someone help urgent we are writing a test tmr can some one please explain subatomic particles to me...
Answers
Answer:
n physical sciences, subatomic particles are smaller than atoms. They can be composite particles, such as the neutron and proton; or elementary particles, which according to the standard model are not made of other particles. Particle physics and nuclear physics study these particles and how they interact.
Explanation:
a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle).
SOMEBODY HELP ME THIS IS MY THRID EVER QUESTION AND I NEED YOUR AMAZING HELP PLEASE PLEASE HELP ME FREINDS
Why does the earth experience high tides?
Lesson 3.01
Question 2 options:
High tides occur because Jupiter is in alignment with Saturn
This causes areas of water that bulge away from the earth.
The earth experiences high tides because the gravitational force of the moon attracts the water and solid earth, pulling them closer to the moon
High tides occur because the comet Neowise passed by Earth
Spring Tides: Choose ALL that apply
Lesson 3.01
Question 3 options:
Moon, Sun, and Earth are aligned
Highest of the high tides and lowest of the low tides.
Occurs twice a month
Moon, Sun, and Earth are perpendicular
Question 4 (1 point)
Choose ALL that apply for neap tides
Lesson 3.01
Question 4 options:
Moon, Sun, and Earth are in alignment
Smaller than normal range of high and low tides.
Gravity of the Sun and Moon work against each other
Moon and Sun are at right angles to the Earth
Question 5 (1 point)
What is the difference between rotation and revolution?
Lesson 3.03
Question 5 options:
Revolution is when an object travels in a path around another.
Rotation is when an object travels in a path around another.
Revolution is when an object spins around its axis.
Rotation is when an object spins around its axis.
Question 6 (1 point)
What is the shape of the planet's revolutions?
Lesson 3.03
Question 6 options:
It is a circle
It is an oval
It is elliptical
It is a sqare
Question 7 (1 point)
How long does it take for the Earth to make ONE revolution around the Sun? How long does it take for Earth to rotate?
Lesson 3.03
Question 7 options:
It takes a day. It takes a year
It takes a week. It takes a day.
It takes a year. It takes a day
It takes a day. It takes a week
Question 8 (1 point)
Earth's revolution causes day and night.
Lesson 3.03
Question 8 options:
True
False
Question 9 (1 point)
Why is it warmer in the summer?
Lesson 3.04
Question 9 options:
The earth's axis does not have a tilt
The rotation of Earth
The tilt of the earth's axis away from the sun allows those parts of the earth to have more sunlight.
The tilt of the earth's axis towards the sun allows those parts of the earth to have more sunlight.
Question 10 (1 point)
The seasons are caused by the tilt of Earth's axis
Lesson 3.04
Question 10 options:
True
False
Answers
Answer:
Answer 4. C and D also known as "Gravity of the Sun and Moon work against each other "
"Moon and Sun are at right angles to the Earth"
Answer 5. A and D also known as "Revolution is when an object travels in a path around another." "Rotation is when an object spins around its axis"
Answer 6. It is elliptical
Answer 7. It takes a year. It takes a day
Answer 8. False
Answer 9. The tilt of the earth's axis towards the sun allows those parts of the earth to have more sunlight.
Answer 10. True
Many ski resorts and mountain cities can be reached directly by planes which deposit travelers a mile or more above sea level. This can result in altitude sickness due to hypoxemia, or reduced oxygen in the blood, caused by the unaccustomed exposure to the lower atmospheric pressure at high elevations. On a given day, the prevailing atmospheric pressure in Albuquerque, NM (elevation 1620 meters) might be 0.799 atm. Calculate this pressure expressed in mmHg and in torr. Relationship between altitude and barometric pressure.
Answers
Answer:
See explanation
Explanation:
To convert from atm to mmHg
1 atm = 760 mmHg
0.799 atm = 0.799 atm * 760 mmHg/1 atm = 607.24 mmHg
To convert from atm to torr
1 atm = 760 torr
0.799 atm = 0.799 atm * 760 torr/1 atm = 607.24 torr
can someone help me ????
Answers
Answer:
B) Lithium
C) Barium
F) Potassium
Explanation:
All of the above are Inorganic Compounds.
Answer:
[tex]\boxed {\boxed {\sf Cobalt, Iron, and \ Copper}}[/tex]
Explanation:
The Stock System states that In a chemical formula or equation, some metals need a roman numeral after their symbol. If a metal has multiple oxidation states, it needs a roman numeral.
Use the Periodic Table to see the oxidation states for each metal.
Cobalt (Co): +3, +2 Lithium (Li): +1 Barium (Ba): +2 Iron (Fe): +3, +2 Copper (Cu): +2, +1 Potassium (K): +1We can see that cobalt, iron, and copper have more than one oxidation state, so they would require a roman numeral.
o
Plants rely heavily on _______
in the nitrogen cycle to incorporate nitrogen into organic come pounds
1 oxygen
2 viruses
3 bacteria
4 fungi
Answers
Answer:
3. Bacteria
Explanation:
If you don't trust me, search it up!
What effect does pollution have on condensation? A There are more particles in the air for water vapor to cluster around. B Areas with more pollution have more clouds and rain. C Pollution creates more ground level clouds. D It is harder for the sun to warm up the water vapor.
Answers
Answer:
A There are more particles in the air for water vapor to cluster around.
Explanation:
As the condensation process takes place more particles are added to the atmosphere for water vapour and condensation further leads to the build-up of clouds. If the sky is polluted with pollutants the condensation can raise the level of pollution by blocking the rays of the sun from reaching the ground. This affects the visibility of most of the cities.Which is true regarding the density of air?
Answers
1. All societies base their calendars and timekeeping systems on the
apparent motion of the Sun and Moon.