Answer:
I think 5
Explanation:
How many liters of O2 at STP will react with 8.7 grams of C2H4 to form CO2 and H2O? C2H4 + 3 O2 -------> 2 CO2 + 2 H2O
Answer:
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
Explanation:
The balanced reaction is:
C₂H₄ + 3 O₂ ⇒ 2 CO₂ + 2 H₂O
Being the molar mass of the elements:
C: 12 g/moleH: 1 g/moleThen the molar mass of compound C₂H₄ is:
C₂H₄= 2*12 g/mole + 4*1 g/mole= 28 g/mole
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), 1 mole of C₂H₄ acts. Then, being the mass of a mole of a substance, which can be an element or a compound, 1 mole of C₂H₄ is 28 g, which is the amount of mass that reacts in this case.
Then be able to apply the following rule of three: if by stoichiometry 28 grams of C₂H₄ react with 3 moles of O₂, 8.7 grams of C₂H₄ with how many moles of O₂ do they react?
[tex]moles of O_{2} =\frac{8.7 grams ofC_{2} H_{4}*3 moles of O_{2} }{28grams ofC_{2} H_{4}}[/tex]
moles of O₂= 0.31
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Then we can apply the following rule of three: if by definition of STP 1 mole occupies 22.4 L, 0.31 moles how much volume will it occupy?
[tex]volume=\frac{0.31 moles*22.4 L}{1 mole}[/tex]
volume= 6.944 L
6.944 liters of O₂ at STP will react with 8.7 grams of C₂H₄ to form CO₂ and H₂O.
The volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
First, we will determine the number of moles of O₂ required.
From the given balanced chemical equation,
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O
This means
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Now, we will determine the number of moles of C₂H₄ present
Mass of C₂H₄ = 8.7 g
Using the formula
[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass}[/tex]
Molar mass of C₂H₄ = 28.05 g/mol
∴ Number of moles of C₂H₄ = [tex]\frac{8.7}{28.05}[/tex]
Number of moles of C₂H₄ = 0.31016 mole
Since
1 mole of C₂H₄ is required to react completely with 3 moles of O₂
Then,
0.31016 mole of C₂H₄ will react completely with 3 × 0.31016 mole of O₂
3 × 0.31016 = 0.9305 mole
∴ Number of moles of O₂ required is 0.9305 mole
Now, for the volume of O₂ at STP that will react
Since 1 mole of a gas occupies 22.4 L at STP
Then,
0.9305 mole of O₂ will occupy 0.9305 × 22.4 L at STP
0.9305 × 22.4 = 20.8432 L
≅ 20.8 L
Hence, the volume of O₂ at STP that will react with the given C₂H₄ is 20.8 L
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What is an animal-like, unicellular protist called?
protozoan
euglenoid
slime mold
decompos
Answer:
protozoan
Explanation:
An animal - like unicellular protist is called a protozoan. Such organisms shows similarities with animals.
Protozoans are unicellular organisms. They are similar to animals in that they perform nearly all life functions that makes animals very unique. They are mostly heterotrophs which feed on foods that have been produced by autotrophs. Examples are flagellates and ciliates.A compound whose empirical formula is NO₂ could have a molecular mass of? 23 g/mol 39 g/mol 92 g/mol 120 g/mol
The molecular formula of a compound gives the actual number of atoms of various elements present in one molecule of the compound. The molecular mass is 92 g/mol. The correct option is C.
What is empirical formula?The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
The molecular formula of a compound is a whole number multiple of its empirical formula.
Molecular formula = n × Empirical formula
The value of 'n' can be obtained from the relation:
n = Molecular mass / Empirical formula mass
Here the value of n = 2. Then,
Molecular mass = n × Empirical formula mass
Empirical formula mass of NO₂ = 45.8 g
2 × 45.8 = 91.6 ≈ 92 g/mol
Thus the correct option is C.
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A sample of carbon dioxide gas at a pressure of 891 mm Hg and a temperature of 84 C occupies a volume of 5.61 L. If the gas is cooled at constant pressure to a temperature of 40 C, the volume of the gas will be __ L.
Answer:
4.92L
Explanation:
Given parameters:
Initial pressure = 891mmHg
Initial temperature = 84°C = 84 + 273 = 357k
Initial volume = 5.61L
New temperature = 40°C = 273 + 40 = 313k
Unknown:
New volume = ?
Solution:
Since we are dealing with constant pressure condition, we apply charles's law.
It states that the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant.
Mathematically ;
[tex]\frac{V1}{T1}[/tex] = [tex]\frac{V2}{T2}[/tex]
V1 is the initial volume V2 is the new volume
T1 is the initial temperature T2 is the new temperature
[tex]\frac{5.61}{357}[/tex] = [tex]\frac{V2}{313}[/tex]
V2 = 4.92L
how does the earth give us what we call and night
Answer:
the Earth rotates on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. it takes 24 hours for the world to turn all the way around, and we call this a day.
Explanation:
Sulphur is found in many forms in the nature. S2, S6 and Ss being some of them. What can we say
will certainly be common among these forms of sulphur?
(A) They will exhibit same physical properties
(B) They will exhibit same chemical properties
(C) Sulphur atoms in each will be identical
(D) All of the above
Answer:
What can be said about these common forms of sulphur is that;
(B) They will exhibit same chemical properties
Explanation:
Allotropy is the property of an element to exist in two or more forms in the same physical state
Allotropes have several similar chemical properties but differ in their physical properties, such as the white, pale yellow to totally colorless diamond and the gray graphite
Sulphur can exist in several allotropic forms, and carbon is the only element that has more allotropes than sulphur
The sulphur allotropes includes S₂, S₆, and S₅ have similar chemical properties but different physical properties.
The correct option is;
What can be said about these common forms of sulphur is that they have the same chemical properties
Increasing the temperature of a given amount of gas at constant volume causes the pressure to increase because _____. there is less space where the molecules can move around there are more molecules the molecules are striking a larger area with less force the molecules are moving more quickly
Answer:
the molecules are moving more quickly
Explanation:
The relationship between temperature and pressure is explained using the kinetic theory of matter.
As the temperature of the gas is increased, the molecules have a greater kinetic energy. This increased energy of the gas molecules make the collision between the molecules and with the walls of the container more rapid.
The correct option is;
the molecules are moving more quickly
The compound F2O has two lone pairs on the central oxygen atom. What's the structure of an F2O molecule? Is this compound polar or non-polar? Question 1 options: A) Bent or angular, polar B) Trigonal planar, polar C) Bent or angular, non-polar D) Trigonal planar, non-polar
Answer: A) Bent or angular, polar
Explanation:
The central atom oxygen has two lone pairs and two bond pairs in [tex]OF_2[/tex]. The number of electron pairs are 4, that means the hybridization will be [tex]sp^3[/tex] and the electronic geometry of the molecule will be tetrahedral. But as there are two lone pair of atoms around the central oxygen atom, repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent shape.
The compound [tex]OF_2[/tex] is polar as the net dipole moment of oxygen - fluoride bonds do not cancel each other out.
(a)A can of soda contains 12.0 fl oz. What is the volume in liters (given
that 1 L =
1000 mL)?
Answer:
0.355L
Explanation:
1fl oz (Fluid ounce) is an unit of volume widely used in United States of America. 1fl oz is equivalent to 29.5735mL.
12.0 fl oz are:
12.0fl oz * (29.5735mL / 1fl oz) = 354.9mL
There are 354.9mL in 12.0 fl oz.
As 1L = 1000mL, in 354.9mL you have:
354.9mL * (1L / 1000mL =
0.355LWhat is the percent by mass of Nitrogen in Mg(NO3)2?
Answer:
18.888%
Explanation:
is an example of an element and example of a compound
Answer:
Only some elements
Explanation:
Stephanie the Skydiver has a mass of 48kg, what is the force that she
exerts as she is falling to the ground?
Answer:
470.4N
Explanation:
Given parameters:
Mass of Stephanie = 48kg
Unknown:
Force she exerts while falling to the ground = ?
Solution:
The force she exerts is her weight;
Weight = mass x acceleration due to gravity
Now insert the parameters ands solve ;
Weight = 48 x 9.8 = 470.4N
help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Choose the statements below that are correct regarding the nature of protons and neutrons. Choose ALL statements that are correct.
a. protons and neutrons are found around the outer edge of the atom
b. protons and neutrons have approximately the same charge
c. protons and neutrons are found in the nucleus
d. protons and neutrons have approximately the same mass
Answer:
c. protons and neutrons are found in the nucleus
d. protons and neutrons have approximately the same mass
Explanation:
There are three fundamental particles within an atom which are the protons, neutrons and electrons.
The protons are the positively charged particles within an atom
Neutrons do not carry any charges
Electrons are the negatively charged particles.
Both the protons and neutrons occupy the tiny nucleus at the center of the atom. The electrons moves round the nucleus through the orbital space. The mass of the protons and neutrons are similar and are assumed to be approximately the same.why do stars appear to be bigger in the night?
Answer: in the daytime the sun is out so the stars are not visible becuase the suns reflection! At night When you gaze at the constellations, every star produces an image that's the same size, but your retina isn't sensitive enough to respond to the outer parts of those images except for the brighter stars — which therefore look bigger than the fainter ones.
Explanation:
This is what I found on goog.le a while ago now it might actually help if I’m wrong I apologiz, I hope this was your quistion!
If you have 8.5 moles of water (H2O), how many grams of water do you have?
Answer: i think it is 144.16
Explanation:
butter is made by intentionally changing the density of the milk. Try to find out how this change is made and describe it briefly. Explain these changes using particle theory
PLS HELP I RLY NEED IT :)
Answer:
As temperature increases, a substance will change from solid, to liquid, to gas. ... Apply Butter is made by intentionally changing the density of liquid milk.
Explanation:
10 While a student is holding a piece of metal in her hand, her hand gets colder. What happens to the temperature of the metal? * m (6 Points) A. The piece of metal will get warmer because some thermal energy is transferred from the metal to the student's hand. B. The piece of metal will get warmer because some thermal energy is transferred from the student's hand to the ON metal. C. The piece of metal will stay at the same temperature because an equal amount of thermal energy is exchanged between the student's hand and the metal. D. The piece of metal will stay at the same temperature because thermal energy is not transferred between the student's hand and the metal.
Answer:
B
Explanation:
thermal energy is the energy between one object to another
You have a particle of length 68 nm. What is this in meters? ( need help asap)
Answer:
B
Explanation:
Write this in a word and skeleton equation:
Solid silver chloride and an aqueous solution of nitric acid are produced when a solution of silver nitrate is reacted with a solution of hydrochloric acid.
Answer:
Write this in a word and skeleton equation:
Solid silver chloride and an aqueous solution of nitric acid are produced when a solution of silver nitrate is reacted with a solution of hydrochloric acid.
Explanation:
hurry please Which of the following is a compound?
CO2
Ne
O2
P4
Answer:
p4
Explanation:
In an electrically neutral atom of any element, there are equal numbers of
A. Protons and neurons.
B. electrons and procons.
C. electrons and neurrons.
D. atomic number and atomia mess. 5
Answer:
B. electrons and protons.
Explanation:
In an electrically neutral atom of any element, there are equal number of protons and electrons in the atom.
Protons are the positively charged particles in an atom.
Electrons are the negatively charged particles within the atom.
When the number of protons and electrons are the same or equal, the atom is neutral.
But when there is an imbalance, an ion results.
I traveled for 0.5 hr at 80 km/h. How far did I travel?
Answer:
[tex]Distance = 40km[/tex]
Explanation:
Given
[tex]Speed = 80km/hr[/tex]
[tex]Time = 0.5hr[/tex]
Required
Determine the distance covered
Distance is calculated as:
[tex]Distance = Speed * Time[/tex]
Substitute values for Speed and Time
[tex]Distance = 80km/hr * 0.5hr[/tex]
[tex]Distance = 80km * 0.5[/tex]
[tex]Distance = 40km[/tex]
Hence, you travelled 40km
Which section of the ocean floor is near the coastline of all continents?
Answer shallow ocean
Explanation:
i think
PLEASE HELP. WILL GIVE BRAINLIEST AND QUESTION WORTH A 100 POINTS. NEED ANDWER ASAP!
Conclusion: In a paragraph, describe how physical and chemical properties help us
identify the difference between metals, nonmetals and metalloids. Discuss
characteristics that metals have in common, characteristics that nonmetals have in
common, and characteristics that metalloids have in common.
Answer:
extensive properties such as mass and volume depend on something like perhaps the amount of what's measured. physical properties can be measured without changing substance chemical identity.
metals are the elements which exhibit degree of metallic behavior is know as metals. non metals are such elements which do not posses any metallic behavior and mekkloids are those elements that posses some of the properties like metal. but they act either like metals or non metals n they also have the same physical properties
how many oxygen atoms are in 10.0g of 2Al2 CO3 3
Answer:
0.776 ×10²³ atoms of oxygen
Explanation:
Given data:
Mass of Al₂CO₃ = 10.0 g
Number of atoms of oxygen = ?
Solution:
Number of moles of Al₂CO₃:
Number of moles = mass/molar mass
Number of moles = 10.0 g/233.99 g/mol
Number of moles = 0.043 mol
1 mole of Al₂CO₃ contain 3 mole of oxygen.
0.043 ×3 mol = 0.129 mol
Number of atoms of oxygen:
1 mole contain 6.022×10²³ atoms
0.129 mol × 6.022×10²³ atoms / 1mol
0.776 ×10²³ atoms of oxygen
I need help pls Where does it belong to?
Why do molecules with dipole-dipole force have higher melting and boiling points than molecules
that only exhibit London Dispersion force?
Answer:
Because dipole - dipole force is stronger than london dispersion force
Explanation:
Intermolecular forces determines a wide range of physical properties of matter of which melting point is one of them.
Both london dispersion forces and dipole- dipole forces are vanderwaals force.
But diople - dipole forces exists between polar molecules which are molecules with permanent dipoles.
In london dispersion forces the dipole is temporary
What are the homologous series?
Explanation:
Homologous series are the series belonging to a series of aliphatic organic compounds that differ only by the addition of a CH2 group
Hope it will help :)❤
How can the conductivity of a salt solution be decreased?
A. Add more salt to increase the concentration.
B. Add more water to decrease the concentration.
C. Add more water to increase the concentration.
D. Add more salt to decrease the concentration.
Answer:
B. Add more water to decrease the concentration.
Explanation:
If we add more water to the solution, the concentration is decreased and like wise the conductivity of the solution.
Concentration is the amount of solute in a solution. Conductivity deals with the ability of a solution to allow the passage of current.Concentration and conductivity are directly proportional to one another. The higher the concentration, the higher the conductivity and vice versa.
Adding more water increases the amount of solvent and the concentration reduces.