The molecular weight of unknown gas : 23.46 g/mol
Further explanationGiven
A vessel contains 10% of oxygen and 90% of an unknown gas.
diffuses rate of mixed gas = 86 s
diffuses rate of O₂ = 75 s
Required
the molecular weight of unknown gas (M)
Solution
The molecular weight of mixed gas :(M O₂=32 g/mol)
[tex]\tt 0.1\times 32+0.9\times M=3.2+0.9M[/tex]
Graham's Law :
[tex]\tt \dfrac{r_{O_2}}{r_{mixed~gas}}=\sqrt{\dfrac{M_{mixed}}{M_{O_2}} }\\\\\dfrac{75}{86}=\sqrt{\dfrac{3.2+0.9M}{32} }\\\\0.76=\dfrac{3.2+0.9M}{32}\\\\24.32=3.2+0.9M\\\\21.12=0.9M\rightarrow M=23.46~g/mol[/tex]
Which statement explains why astronauts appear to bounce when they are walking on the moon?
The force of gravity acting on the astronauts is stronger on the moon than on Earth
The force of gravity acting on the astronauts is weaker on the moon than on Earth.
The force of air resistance acting on the astronauts is weaker on the moon than on Earth.
The force of air resistance acting on the astronauts is stronger on the moon than on Earth
Astronauts appear to be bouncing on the moon because the force of gravity is weaker on the moon.
What is the importance of the force of gravity?On planets such as Earth and natural satellites such as the moon, gravity causes objects are pulled towards the center of the planet/natural satellite.
How is gravity different on the moon?On the moon, this force is weaker than on the Earth. Indeed, the gravity of Earth is equivalent to 9,807 m/s, while the gravity on the moon is 1,62 m/s.
This causes objects are still pulled towards the center of the moon but they are pulled with a much weaker force. Therefore, when people walk on the moon they seem to bounce.
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A particular first-order reaction has a rate constant of 1.35 × 10^2 s−1 at 25.0 ∘C. What is the magnitude of k at 65.0∘C if Ea = 55.5 kJ/mol.
The magnitude of k at 65.0∘C : 1912.7 /s
Further explanationGiven
k at 25 °C = 1.35 x 10² /s k1
T₁=25 + 273 = 298 K
T₂=65 + 273 = 338 K
Required
the magnitude of k at 65.0∘C
Solution
Arrhenius Equation :
[tex]\tt ln(\dfrac{k_1}{k_2})=(\dfrac{1}{T_2}-\dfrac{1}{T_1})\dfrac{Ea}{R}[/tex]
R : gas constant= 8.314 J/molK
Input the value :
[tex]\tt ln(\dfrac{1.35\times 10^2}{k_2})=(\dfrac{1}{338}-\dfrac{1}{298})\dfrac{55.5.10^3}{8.314}\\\\ln(\dfrac{135}{k_2})=-2.651\rightarrow \dfrac{135}{k_2}=e^{-2.651}\rightarrow k_2=1912.7[/tex]
Temperature,
[tex]T_1 = 25^{\circ} C[/tex] or, [tex]298 \ K[/tex][tex]T_2 = 65^{\circ} C[/tex] or, [tex]338 \ K[/tex]Rate constant,
[tex]1.35\times 10^2 \ s^{-1}[/tex]Gas constant,
[tex]R = 8.314 \ J/mol[/tex]By using the Arrhenius equation, we get
→ [tex]ln (\frac{k_1}{k_2} ) = (\frac{1}{T_2} - \frac{1}{T_1} )\frac{Ea}{R}[/tex]
By substituting the values, we get
→ [tex]ln (\frac{1.35\times 10^2}{k_2} ) = (\frac{1}{338} - \frac{1}{298} )\frac{55.5\times 10^3}{8.314}[/tex]
→ [tex]ln (\frac{135}{k_2} ) = -2.651[/tex]
[tex]\frac{135}{k_2} = e^{-2.651}[/tex]
[tex]k_2 = 1912.7[/tex]
Thus the response above is right.
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Which of the following energy resources provides non-recyclable energy and is also the least polluting?
a) Biomass energy
b) Nuclear power
c) Hydropower
d) Natural gas
Answer:
b) Nuclear power
Explanation:
The nuclear power plant generated the nuclear energy that utilize the radio active materials like uranium i.e. finite. Thus, this is a non-recyclable.
Also this energy does not release any type of polluting gas neither it is harmful like carbon dioxide or any green house gases So it would be least polluting
Therefore as per the given statement, the option b is the correct one
Answer:
b) Nuclear power
Explanation:
took the test :)
How many moles of water are present in 55.1 g of H2O
Answer:
3.0585147719047385 is the answer
100 pts, 4 questions I am having issues answering
17 Explain oxidation using rust as an example
19 What is a solution that cannot dissolve any more solute because it is too concentrated?
26 What two factors contribute to expansion?
32 How are the groups organized in the periodic table? What do all the elements in a group have in common?
Answer:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
Explanation:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
For the reaction represented by the equation 2h+O2– 2H2O, how may grams of water are produced from 6.00 mol of hydrogen?
Atomic mass of hyorogen = 1.0gmol
Atomic mass of oxygen = 16.0 omo
Answer:
Mass = 108 g
Explanation:
Given data:
Mass of water produced = ?
Number of moles of hydrogen = 6.00 mol
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Now we will compare the moles of hydrogen with water.
H₂ : H₂O
2 : 2
6 : 6
Mass of water:
Mass = number of moles × molar mass
Mass = 6 mol × 18 g/mol
Mass = 108 g
what is the modification of the small intestinal wall that serves to increase surface area?
Answer:
Villi
Explanation:
Villi are folds on the small intestine lining that increase the surface area to facilitate the absorption of nutrients.
The modification of the small intestinal wall that serves to increase surface area is called the microvilli.
What is meant by villi ?Along the length of your small intestine, there are minute, finger-like extensions called intestinal villi comprised of cells.
Here,
Villi are projections that are finger-like and are densely populated with blood vessels. They are found in the inner lining of the small intestine and aid in nutrient absorption by expanding the surface area for absorption.
When we consume food, nutrients are taken up by our villi, which subsequently transport them into our bloodstream to be transported to where they are needed.
Digestive enzymes are present in the microvilli, which aid in the breakdown of proteins and carbohydrates. Villi aid in nutrient absorption in this manner.
Hence,
The modification of the small intestinal wall that serves to increase surface area is called the microvilli.
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what happens to energy when sally kicks a soccor ball
Answer:
it is turned into kinetic energy
Explanation:
Answer:
Kinetic energy is transferred from the leg to the soccer ball. or C
Explanation:
Hope this helps
For test 6 (150 hevy 50 light particles), what is the pressure contribution from the heavy particles?
Answer:
The pressure contribution from the heavy particles is 17.5 atm
Explanation:
According to Dalton's law of partial pressures, if there is a mixture of gases which do not react chemically together, then the total pressure exerted by the mixture is the sum of the partial pressures of the individual gases that make up the mixture.
In the simulation:
the pressure of the 50 light particles alone was determined to be 5.9 atm, the pressure of the 150 heavy particles alone was measured to be 17.5 atm,
the total pressure of the mixture of 150 heavy and 50 light particles was measured to be 23.4 atm
Total pressure = partial pressure of Heavy particles + partial pressure of light particles
23.4 atm = partial pressure of Heavy particles + 5.9 atm
Partial pressure of Heavy particles = (23.4 - 5.9) atm
Partial pressure of Heavy particles = 17.5 atm
Therefore, the pressure contribution from the heavy particles is 17.5 atm
Jay and Jeff were responsible for recording the class weather data each day in march. What weather instrument, seen here, should they use for measuring the daily wind speed
Answer:
east
Explanation:
Which set of atoms have 3 valence electrons?
carbon, silicon, and germanium
O beryllium, magnesium, and calcium
O hydrogen, lithium, and sodium
O boron, aluminum, and gallium
Answer:
boron, aluminum, and gallium
Explanation:
They are in group 3A on the periodic table which means they have 3 valence electrons
Measurements also show that a certain sample of the unknown compound contains 6.2 mol of oxygen and 4.1 mol of nitrogen.
Write the complete chemical formula for the unknown compound.
The chemical formula for the unknown compound : N₂O₃
Further explanationGiven
6.2 mol of oxygen and 4.1 mol of nitrogen.
Required
The chemical formula
Solution
Chemical formulas can be expressed in terms of empirical or molecular formulas.
The empirical formula shows the simplest mole ratio of a compound
Meanwhile, the molecular formula shows the actual ratio of the number of elements that make up the compound
We divide the two known moles by the smallest mole (moles of nitrogen)
[tex]\tt N\div O=\dfrac{4.1}{4.1}\div \dfrac{6.2}{4.1}=1\div 1.5=2\div 3[/tex]
Which phrase describes a liquid?
O A. Changing shape and fixed volume
OB. Fixed shape and changing volume
O C. Changing shape and volume
O D. Fixed shape and volume
Answer:
C. Changing shape and volume
Explanation:
If a volume is fixated it can't have free motion/roam like your typical liquid.
The pH scale for acids and bases ranges from
A. 17
B. 0-14
C. 1-14
D. 1-12
Answer: 0-14
Explanation: Hope this helps
How many moles of magneslum chloride are there in 148 grams of magnesium chloride?
Answer:
1.554442238816872 moles
Explanation:
Answer:
1.5544422388169434
Explanation:
1 mole is equal to 1 moles Magnesium Chloride, or 95.211 grams.
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Calculate the amount of heat in kilojoules required to vaporize 2.58 kg of water at its boiling point.
Answer:
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
Explanation:
A substance undergoes a change in temperature when it absorbs or gives up heat to the environment around it. However, when a substance changes phase it absorbs or gives up heat without causing a change in temperature. The heat Q that is necessary for a mass m of a certain substance to change phase is equal to:
Q = m*L
where L is called the latent heat of the substance.
In this case:
m=2.58 kgThe heat of vaporization of water is L=2260*10³ J/kgReplacing:
Q= 2.58 kg* 2260*10³ J/kg
Q= 5,830,800 J = 5,830.8 kJ (Being 1,000 J= 1 kJ)
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
The required amount of heat will be "5830 KJ".
Given:
Amount of water,
m = 2.58 kgAs we know,
Latent heat of vaporization,
[tex]L_{vap} = 2260\times 31 \ kg[/tex]Now,
The amount of heat required will be:
= [tex]m\times L_{vap}[/tex]
= [tex]2.58\times 2260[/tex]
= [tex]5830 \ KJ[/tex]
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What is the formula for trihydrogen dioxide?
H2O or just water if you need to be simple
If the decomposition of a sample of KClO3 produces 3.29 g of O2. What was the mass (g) of the original sample?
Answer: 8.41 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{3.29g}{32g/mol}=0.103moles[/tex]
The balanced chemical equation for decomposition is :
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
As 3 moles of [tex]O_2[/tex] are produced by = 2 moles of [tex]KClO_3[/tex]
Thus 0.103 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{3}\times 0.103=0.0687moles[/tex] of [tex]KClO_3[/tex]
Mass of [tex]KClO_3=moles\times {\text {Molar mass}}=0.0687moles\times 122.5g/mol=8.41g[/tex]
8.41 g was the mass of the original sample.
Is the following chemical reaction balanced? 2H2O2 H2O + O2 yes no
3. An atom is electrically neutral, on loss or
jain of electrons why does it become charged?
Answer:
when atom is neutral it has a no charge, looses electron has positive charge, gains electron gets negative charge
Explanation:
protons have positive charges (+)
electrons have negative charges (-)
when an atom is neutral is means no additional electron is lost or gain
When an atom has a neutral charge it has neither too much or too little electrons since it has not gained or lost any thus the zero charge ( no charge)
When an atom loses an electron since its losing an electron that has a negative charge it becomes a bit more positive so thus the positive charge
When the atom gains an electron it gains a bit more negativity then it had so its going to have a negative charge
CaSO4.1/2 H2O molecular mass
I don't care but one another time and I have any questions about this email
strengths as bases:
H2O, F-, Cl-, NO,, and CN-
Answer:
Cl^-<NO3^-<H2O<F^-<CN^-
Explanation:
When we talk about base strength we are referring to how easily a chemical specie accepts protons.
The greater the ability of a specie to accept H^+, the greater its base strength.
The order of increasing base strengths of the species listed are shown in the answer above.
so what exactly is motion?
Answer:
just the process or action of moving or being moved lol
The heat of fusion of a compound is 126 Joules
per gram. What is the total number of Joules of
heat that must be absorbed by a 15.0-gram
sample to change the compound from solid to
liquid at its melting point?
Answer:
1.89 × 10³ J
Explanation:
Step 1: Given data
Heat of fusion (ΔH°fus): 126 J/gMass of the sample (m): 15.0 gStep 2: Calculate the heat (Q) required to melt the sample
The fusion is the phase change from solid to liquid. We can calculate the heat required for the fusion of the sample using the following expression.
Q = ΔH°fus × m
Q = 126 J/g × 15.0 g
Q = 1.89 × 10³ J
Describe what happens in the cell before the chemical reaction.
___________________________________________________________
Answer:
Chemical reactions that take place inside living things are called biochemical reactions. The sum of all the biochemical reactions in an organism is referred to as metabolism. Metabolism includes both exothermic (heat-releasing) chemical reactions and endothermic (heat-absorbing) chemical reactions.
___________________________________________________________
Four members of a school first eleven cricket team are also members of the first fourteen rugby team How
many boys play for at least one of the two teams?
Select one
a 12
b 22
C. 14
d 21
Answer:
total 11+14 is 25
now 4 are common and counted twice so subtract 4 so answer is 21
In the event that a chemical gets in your eye while in the lab, you would use the eyewash station. In your at-home lab, however, which of these courses of action (according to your lab procedure)could be used in lieu of an eye wash station?A. Using Visene, contact solution, or a similar eye drop immediatelyB. Using the sprayer on your sink if you have oneC. Pouring milk in your eye(s)D. A vigorous 30-second eye rub
Answer:
Using the sprayer on your sink if you have one
Explanation:
If a chemical gets into your eye, you will need to flush the eye thoroughly with water in order to get the chemical out of the eye before it causes any kind of damage to the eye.
This could normally be done in an eye wash station. However in the absence of an eye wash station, one could use the sprayer of the sink if he/she has one. This will deliver water to completely flush the eye at lower pressure.
The salinity of sea water represents the amount of NaCl (salt) dissolved in the water.
True
False
Yes thank you I love and appreciate this so much woooo
Answer:
Explanation:
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in this trial, 0.400 M NaOH was added to 40.00 ml of 0.400 M HCl. How many ml of base must be added to cause the colour to change?
Answer:
The amount of Ml that is needed