A sample of oxygen gas is collected over water. The volume of gas
collected is 0.250 L at 26°C and 765 torr total pressure. (Water vapor
pressure at 26°C = 25.22 torr)
How many grams of oxygen gas are collected?
If the oxygen gas collected is the product of decomposition of
potassium chlorate, how many grams of potassium chlorate is
decomposed (assuming 100% yield)?
answer: 0.317g, 0.810g
how do I set the problem up?
A. The mass of the oxygen gas collected is 0.317 g
B. The mass of potassium chlorate that decomposed is 0.81 g
A. How to determine the mass of oxygen collected Volume (V) = 0.250 LTemperature (T) = 26 ˚C = 26 + 273 = 299 KPressure (P) = 765 – 25.22 = 739.78 torr = 739.78 / 760 = 0.973 atmGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?The number of mole can be obtained as by using the ideal gas equation as illustrated below:
n = PV / RT
n = (0.973 × 0.25) / (0.0821 × 299)
n = 0.0099 mole
Thus the mass of oxygen collected can be obtained as follow:
Mole of oxygen = 0.0099 mole Molar mass of oxygen = 32 g/mol Mass of oxygen =?Mass of oxygen = mole × molar mass
Mass of oxygen = 0.0099 × 32
Mass of oxygen = 0.317 g
B. How to determine the mass KClO₃Balanced equation
2KClO₃ —> 2KCl + 3O₂
From the balanced equation above,
3 moles of O₂ were obtained from 2 moles of KClO₃
Therefore
0.0099 mole of O₂ will be obtained from = (0.0099 × 2) / 3 = 0.0066 moles of KClO₃
Thus, the mass of KClO₃ that decomposed can be obtained as follow:
Mole of KClO₃ = 0.0066 mole Molar mass of KClO₃ = 122.5 g/molMass of KClO₃ =?Mass = mole × molar mass
Mass of KClO₃ = 0.0066 × 122.5
Mass of KClO₃ = 0.81 g
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2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
5.27 g
269
6900
on
Answer:
5.27
Explanation:
What do ferns, gymnosperms, and angiosperms have in common? pls answer
Select all the true statements. The conjugate base of a strong acid is a very weak base. The conjugate base of a strong acid is a strong base. The conjugate base of a weak acid is a strong base. The conjugate base of a weak acid is a weak base.
Answer:
- The conjugate base of a weak acid is a strong base.
- The conjugate base of a strong acid is a very weak base
Explanation:
The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base. These two statements are true.
What is strong base ?It is a substance with the capacity to take a proton out of an extremely weak acid. In water, they can also entirely separate into its ions. Examples include sodium hydroxide and potassium hydroxide (KOH) (NaOH).
The stronger the acid and the weaker its conjugate base are, the higher the Ka. Similar to this, the stronger a material is as a base and the weaker its conjugate acid's acidity, the higher the Kb.
Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution. There aren't many strong bases, and any base that isn't on the list is.
Thus, The conjugate base of a strong acid is a very weak base, and the conjugate base of a weak acid is a strong base.
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7. A sample has 1.70 moles in a volume of 5.8 Lat 25 C. How many liters would be
required for 1.45 L?
Answer:
i think it would 40
Explanation:
Which items are true concerning a typical "thermos bottle"?
A. Radiation is hindered by the silver coatings.
B. The silver coatings stop convection losses.
C. Conduction losses are prevented by the vacuum.
D. Convection is not possible because of the vacuum.
E. The glass walls will not conduct heat.
Answer:
A, C, and D!
Explanation:
The items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.
What is the significance of the radiation?Radiation is significant as it is the movement of heat energy from one place to another and plays a significant role in heat transfer as here in the thermos bottle, the silver coatings on the outside of the bottle help to prevent heat loss due to radiation, and the reflective portions further aid in such a process.
Hence, the items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.
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what makes up a molecule of oxygen gas?
Answer:
2 oxygen atoms make oxygen gas
A molecule of oxygen gas is composed of two oxygen atoms chemically bonded together. The symbol for oxygen is "O," and the atomic number is 8, indicating that each oxygen atom has 8 protons in its nucleus.
A covalent bond is a type of chemical bond that occurs between two atoms when they share one or more pairs of electrons. It is a strong bond that holds atoms together to form molecules.
In a covalent bond, atoms share electrons in order to achieve a more stable electron configuration, typically by filling their outermost energy levels (valence shells). By sharing electrons, both atoms involved in the bond can achieve a more stable configuration, similar to the noble gas configuration.
In an oxygen gas molecule, the two oxygen atoms are held together by a covalent bond. Covalent bonds involve the sharing of electron pairs between atoms. In the case of oxygen gas, each oxygen atom shares two electrons with the other oxygen atom, resulting in a stable molecule.
Therefore, a molecule of oxygen gas is made up of two oxygen atoms (O) bonded together by a covalent bond.
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Properties of metals
Answer:
Physical Properties of Metals :
Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).
Hope this helps! :D
Which of these is the best example of a chemical reaction that has a gas as a product?
O A. baking soda in vinegar
O B. liquid wax turns solid
O C. paper shredded
O D. water turns to steam
The best example of a chemical reaction that has a gas as a product is baking soda in vinegar.
What is a chemical reaction?A chemical reaction is one that involves the formation of a new product and is irreversible.
This means that a chemical reaction is characterized by the following:
Evolution of gasTransfer of heatThe reaction between vinegar and baking soda will lead to the formation of gaseous products, hence, it is an example of chemical reaction.
Therefore, the best example of a chemical reaction that has a gas as a product is baking soda in vinegar.
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Next, drag the red block back into the water. Hold it underwater, and quickly record the water level before the block rises. Type the correct measurement in the box. The water level with the red block completely underwater is ____ milliliters.
Answer: 29.6 milliliters
Answer:
4.1 ml
Explanation:
What type of ions have names ending in-ide
Bases are sharp and sweet in taste.
TRUE
FALSE
can someone explain me the chemical equilibrium and the factors//changes effecting it? (mainly the concept of the equilibrium tilting to the left or the right side)
Answer:
In a chemical reaction, equilibrium is achieved when the forward and reverse reactions occur at the same rate.
Equilibrium is influenced by the following:
1) pressure
2) temperature
3) concentration
Bear in mind that CATALYST HAS NO IMPACT ON THE EQUILIBRIUM; IT ONLY INCREASES THE RATE.
PRESSURE:
Only if the reaction's left side contains a greater number of molecules can the pressure be increased in order to boost yield. [tex]{e.g:N}_2+3H_2\rlhar2NH_3[/tex]
Thus, because the left side has four molecules and the right side has two, you should increase pressure to increase yield.
TEMPERATURE:
In order to increase yield, raise the temperature only in ENDOTHERMIC FORWARD reactions.
CONCERNTRATION:
Removing the formed product increases yield.
I hope this helps you
:)
the table below shows some information about 4 orgainc compound P,Q,R, and S
Answer:
paano po yan wala po akong naintindihan sendan niyo po ako ng pic
Fluorine,chlorine and bromine are all in the same group (group7) of the periodic table because they ______ in a similar way
Why is water wet??
Only 70%of people know it.
Answer:
yes because wet is water
Answer: Being a liquid, water is not itself wet, but can make other solid materials wet. Wetness is the ability of a liquid to adhere to the surface of a solid, so when we say that something is wet, we mean that the liquid is sticking to the surface of a material.
help!
Where is visible light located on the EM spectrum?
A. Right in the middle
B. It isn’t on the EM spectrum
C. All the way to the right
D. All the way to the left
|| ▼ Answer ▼ ||
Option D. All the way to the left
|| ✪ Solution ✪ ||
Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.
see the picture below :
The picture shows exactly where the visible light is located in the electromagnetic spectrum .
that is to the left of the ultraviolet radiation, and to the right of infrared (IR).
Hope this Helps! =)
If you have any queries please ask.
When 2. 0 mol CO2 is heated at a constant pressure of 1. 25 atm, its temperature increases from 250 K to 277 K. Given that the molar heat capacity of CO2 at constant pressure is 37. 11 JK-1mol-1 , calculate q, ∆ H and ∆ U
Answer: See below
Explanation:
[tex]\mathrm{At \ constant \ pressure \ the \ heat \ generated \ and \ change \ in \ enthalpy \ are \ equal:} \\\begin{aligned}Q &=\Delta H=n C_{p} \Delta T \\&=2 \times(37.11)(277-250) \\&=2003.94 \mathrm{~J} \\Q &=\Delta H=2.0 \times 10^{3} \mathrm{~J}\end{aligned}[/tex]
[tex]\mathrm{Calculate \ the \ change \ in \ internal \ energy:} \\$$\begin{aligned}\Delta H &=\Delta U+\Delta(P V) \\\Delta U &=\Delta H-n R \Delta T \\&=(2003.94)-(2 \times 8.314 \times(277-250)) \\&=(2003.94)-(448.96) \\\Delta U &=1554.98 \mathrm{~J}\end{aligned}[/tex]
Science pls help help
I answered the question in the photo sent
Which is a example of a solution
Answer:
Salt water
Explanation:
can you please help me im kinda in a hurry thank you
4. Myth: An organism's kingdom only describes physical characteristics.
o Fact:
o Evidence:
5. Myth: Mammals and plants don't belong in the same domain.
o Fact:
o Evidence:
please help and thx nwn
Answer:
4. fact
5.fact
I think this is all fact no evidence
There are three subatomic particles found inside atoms. Two of the subatomic particle have a charge of positive or negative. The one particle that does NOT have a charge is the:
proton
neutron
electron
none of the above
Neutrons don't have a charge. They are neutral
Taking into account the definition of ato, proton, neutron and electron, the correct answer is second option: The one particle that does NOT have a charge is the neutron.
You must know the atom is defined as the smallest particle into which an element can be divided without losing its chemical properties.
Atoms are made up of extremely small particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom and form the nucleus, while electrons surround the nucleus.
Electrons have a negative charge, while the charge of protons is positive. The only ones that have no electrical charge are neutrons.
In this way, the atomic nucleus has a positive charge in which almost all its mass is concentrated, while around the atomic nucleus, there are a certain number of electrons, negatively charged.
Finally, the correct answer is second option: The one particle that does NOT have a charge is the neutron.
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brainly.com/question/1814899?referrer=searchResults brainly.com/question/2449569?referrer=searchResultshttps://brainly.com/question/24445381Determine the empirical formula for :aluminum compound containing oxygen (alxoy) if 4.78g of al reacts and the total mass after reacting is 6.67g,
The empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
How to calculate empirical formula?According to this question, 4.78g of Al reacts with oxygen to form a total mass of 6.67g. This means that the mass of oxygen that reacted is 6.67 - 4.78 = 1.89g
Aluminum = 4.78gOxygen = 1.89gFirst, we convert each mass to moles
Al = 4.78 ÷ 27g/mol = 0.17molO = 1.89 ÷ 16g/mol = 0.12molNext, we divide each value by the smallest
Al = 0.17 ÷ 0.12 = 1.42O = 0.12 ÷ 0.12 = 1Multiply each value by 2
Al = 2.8 = 3
O = 2
Therefore, the empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.
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Raj needs to determine the chemical composition of trace evidence like paint and fiber. Which tool would Raj use to do this?
comparison microscope
scanning electron microscope
microspectrophotometer
gas chromatograph
Answer:
gas chromatograph
Explanation:
I took the test and got it right.
Green plants need light in order to survive Structures in the leaves absorb light, which in turn, helps plants make their
own tood
Under which color of light will plants be least likely to make food?
red
blue
orange
green
Answer:
The color of light in which plants are less likely to produce food is green.
Explanation:
Photosynthesis is the process by which plants take advantage of sunlight to convert it into chemical energy, necessary to manufacture their nutrients, their growth and development.
Plants do not absorb all the colors of the light spectrum, since due to their pigments they absorb colors with specific wavelengths. Green plants do not absorb the color green, but reflect it —due to the chlorophyll pigment— which gives the green color to those leaves.
For this reason, the light that plants take least advantage of to produce food is green light.
Other options:
The colors blue, orange and red can be absorbed by the plant, to a lesser or greater degree.
Answer:
it would be green
Explanation:
Which of the following is the most likely global climate change?
a. a decrease in the overall temperature of the Earth
b. an increase in the overall temperature of the Earth
C. an increase in the number of cold climates
d. no change to global climate
A 0.250 L sample of chlorine gas is collected at a pressure of 105.3 kPa and a temperature of 505 K. What will the volume be if the pressure changes to 100.3 kPa and the temperature decreases to 495 K?
Answer:
V2 = 0.257 LExplanation:
T1 = 505 K
P1 = 105.3 kPa = 1.04 atm
V1 = 0.250 L
T2 = 495 K
P2 = 100.3 kPa = 0.990 atm
V2 = ?
P1V1/T1 = P2V2/T2 must be changed to T2P1V1/T1/P2495 x 1.04 x 0.250 ÷ 505 ÷ 0.990 = V2
V2 = 0.257 L
So 0.257 L is the answer!!
What is another name for green algae?
A. ferns
B. Chlorophyta
C. bryophytes
D. hornworts
Chlorophyta is another name for green algae.
What is green algae?Green algae is a large and diverse group of photosynthetic organisms that are typically green in color due to the presence of chlorophyll. They are found in a variety of habitats, including freshwater, saltwater, and moist terrestrial environments.
Chlorophyta is a phylum of green algae, which are photosynthetic eukaryotic organisms. They are commonly found in freshwater, but can also be found in marine and terrestrial habitats.
Chlorophyta are characterized by their green pigmentation due to the presence of chlorophyll a and b, as well as other accessory pigments.
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Answer:Chlorophyta
Explanation:
Carbon burns in the precence of oxygen to give carbon dioxide.which element equation describes the reaction
Answer:
not going to lie... i suck at science
Explanation:
sorry
What unit of measurement would you use to measure from the Milky Way Galaxy to the Andromeda Galaxy?
Answer:
parsecs
Explanation:
The Sun is at a distance of 8.3 kiloparsecs from the centre of the Milky Way system. When dealing with other galaxies or clusters of galaxies, the convenient unit is the megaparsec (1 megaparsec = 1,000,000 parsecs). The distance to the Andromeda Galaxy (Messier 31) is about 0.76 megaparsec.