Answers
Mass of Oxygen : 8.0 g
Further explanationGiven
1.51 x 10²³ molecules of Oxygen(O₂)
Required
Mass of Oxygen
Solution
1 mol = 6.02 x 10²³ particles(molecules, atoms, ions)
Can be formulated :
N = n x No
n = moles
No = Avogadro's number
Find moles of Oxygen :
n = N/No
n = 1.51 x 10²³ / 6.02 x 10²³
n = 0.251
Mass of Oxygen :
mass = mol x MW O₂
mass = 0.251 x 32 g/mol
mass = 8.032≈ 8.0 g
Related Questions
Ilsa showed her parents a trick she learned in science class. She used water to make ice cubes. Ilsa then placed some ice cubes in a glass containing a clear liquid. The ice cubes floated. She then placed some ice cubes in another glass that also contained a clear liquid. In this glass, the ice cubes sank to the bottom of the glass. Ilsa did not tell her parents that the first glass contained water while the second glass contained rubbing alcohol. What can you conclude from this information?
A.
The ice cubes changed their density.
B.
Water has the same density as alcohol.
C.
Water has a greater density than alcohol.
D.
Alcohol has a greater density than the ice cubes.
Answers
Answer:
C. Water has a greater density than alcohol.
Explanation:
From the experiment, it can be shown that water has a greater density than the alcohol.
The ice cube is able to float in the water because, the density of the ice is less than the density of the water.
Density of ice < Density of water
So, the ice cube sinks in alcohol because the density of the ice cube is greater than the density of the alcohol.
Density of ice > Density of alcohol
Therefore, we can assume that since the density of ice is greater than density of alcohol, then the density of water is greater than that of the alcohol.
If you used 10 grams of aluminum, how many moles of aluminum chloride can be produced?
Answers
Answer:
When 20.0 grams of aluminum and 30.0 grams of chlorine are reacted according to the above equation, the chlorine is the limiting reactant and the maximum yield of aluminum chloride is 0.28 moles or 37.33 grams.
Convert this temperature from °F to °C. Explain how pls?
-2.2 C
10.6°C
2.2°C
33.3°C
Answers
Answer:
Start with the temperature in Fahrenheit (e.g., 100 degrees).
Subtract 30 from this figure (e.g., 100 - 30 = 70).
Divide your answer by 2 (e.g., 70 / 2 = 35).
Complete the table by checking the correct column(s) for each description.
Description
Isotonic
Solution
Hypotonic
Solution
Hypertonic
Solution
7. A solution that has the same osmotic
concentration as a cell's cytoplasm
8. A solution that causes a cell to shrivel
9. A solution that causes a cell to swell
10. A solution that neither shrinks nor swells a cell
11. A solution in which there is more water outside
the cell than inside the cell
12. A solution that causes water to move out of a cell
Answers
Answer:
7. isotonic
8. hypertonic
9. hypotonic
10. isotonic
11. hypotonic
12. hypertonic
What is the reaction of Fe + AgC2H9O2?
Answers
Answer:
To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above. Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored.
Explanation:
Why does the sun seem to change position in the sky?
Answers
The first major contributor to the Sun's apparent motion is the fact that Earth orbits the Sun while tilted on its axis. The Earth's axial tilt of approximately 23.5° ensures that observers at different locations will see the Sun reach higher-or-lower positions above the horizon throughout the year.
hope this helps ^^
Answer:
Because the earth rotation, when we move around the sun for a whole 365 times then we will have passed 1 year.
2Na + 2H2O → 2NaOH + H2
How many grams of NaOH could you make with 8.0465 g of Na?
? g NaOH (use 5 sig fig
Answers
13.994 grams
According to the stoichiometry of the given chemical equation, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is useful in balancing chemical equations and making solutions of different concentrations.As according to the given chemical equation 46 g sodium gives 80 g sodium hydroxide, thus, 8.0465 g of sodium will give 8.0465×80/46=13.9939 grams.
Thus, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
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Scientific notation
1.9 x 10^3 + 2.3 x 10^4
Answers
Which of the following is the mass in grams of 1 mole of a substance?
Answers
Answer:
he molar mass is defined as the mass in grams of 1 mol of that substance. One mole of isotopically pure carbon-12 has a mass of 12 g
Explanation:
n the electron-dot symbol
the dots represent electrons located in —
s, p, and d sublevels.
p sublevels, only.
s sublevels, only.
s and p sublevels, only.
Answers
Answer:
They represent the valence electrons, so s and p sublevels only! This does not include the d block!
During combustion what type of chemical reaction takes place
Answers
for example :
C+O2.........)CO2 +heat and light
2. When an atom loses an electron, it becomes a
_a._positive ion.
c. neutral ion.
b. negative ion.
d. neutral atom.
Answers
Answer:
A
Explanation:
Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
What type of wave occurs on a guitar because both ends are fixed?
O A. destructive
O B. constructive
C. standing
D. musical
Answers
Answer:
Destructive
Explanation:
What kind of reaction is this?
1. Synthesis
2. Decomposition
3. Single Replacement
4. Combustion
5. Double replacement
6. Acid-Base
Answers
Answer:
que se yohdhdhdjdjudbdudbudbff
What happens to the mass of a substance when it is heated, cooled, or mixed with other substances?
Answers
Answer:
the total weight of matter is conserved.
Explanation:
:)
A gas has 1.2 L of volume, 1.8 atm of pressure and 264 K temperature. If both the
volume was doubled but the pressure was halved, what would the new
temperature be?
Your answer
Answers
Temperature does not change, remains 264 K
Further explanationGiven
V₁= 1.2 L
P₁ = 1.8 atm
T₁ = 264
Required
The new temperature
Solution
The volume was doubled = 2V₁ = 2 x 1.2 = 2.4 L(V2)
The pressure was halved = 0.5P₁ = 0.5 x 1.8 = 0.9 atm(P2)
Combined gas law :
P₁V₁/T₁=P₂V₂/T₂
Input the value :
[tex]\tt \dfrac{1.8\times 1.2}{264}=\dfrac{0.9\times 2.4}{T_2}\\\\T_2=264[/tex]
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Forty percent of atoms of an element have a mass of 16 AMU. sixty percent of atoms have a mass of 18 AMU. What is the average atomic mass, in AMU, of this element?
Answers
Answer:
(16)(.40)+18(.60)= Then the average atomic mass in amu is 17.2Someone help plzzzz just need final answers I’ll mark Brainly
Answers
Answer:
Omodium
Explanation:
It’s Umodium
6. Which type of force(s) will cause a change in an object's motion? *
A) Balanced Forces
O B) Unbalanced Forces
Answers
Unbalanced forces cause a change in motion, speed, and/or direction. When two forces act in the same direction on an object, the net force is equal to the sum of the two forces.
Answer:
B.Unbalanced .............
Draw the Lewis structure for the compound beryllium nitride, with chemical formula Be3N2
Answers
Answer:online research
Explanation:
The radii of the atoms become smaller from sodium to chlorine across period 3. This decrease is primarily a result of
Answers
Answer:
Nuclear Charge
Explanation:
As we move from sodium to chlorine across, there's increase in atomic number (protons). This also means there is increase in the valence electrons (The valence electrons is denoted by the group).
As the number of protons increases, the nuclear energy also increases. Due to this, the electrons are attracted more strongly and pulled closely to the nucleus.
Chemical equilibrium is relatively rare in living cells. An example of a reaction at chemical equilibrium in a cell would be
Answers
Answer:
(D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway
Explanation:
A) a reaction in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium
B) a chemical reaction in which the entropy change in the reaction is just balanced by an opposite entropy change in the cellʹs surroundings
C) an endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment
D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway
E) no possibility of having chemical equilibrium in any living cell
The correct answer for a reaction that describes chemical equilibrium in a cell would be a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway .
A reaction in chemical equilibrium is a bi-directional reaction in which both the reactants and the products are present in a stoichiometrically balanced way within the system at a given period of time under specific conditions.
From the definition, a reaction would be in equilibrium if
both the reactant and product are present but have ceased being producednone of the reactant or product is being used by another process within the cell.The correct option is, therefore, D
What method would a geologist use to determine the approximate age of a rock found in a newly discovered formation?
Answers
What type of stress results when two plates converge? Compression Shear Hot spot
Answers
Answer:
Compression
Explanation:
Hi! When two convergent plates collide, they should create compressive pressure, or compression.
the element found in group iiia and in period 2 is called
Answers
Answer:
Boron
Explanation:
The group III A is also known in the periodic table as group 13. The members of the group begin to appear in the second period.
At the beginning of this group III A is boron. Boron is a member of group III A as well as a member or period 2.
Boron is a metalloid and has only three valence electrons as other group III A elements.
Potassium permanganate (KMnO2) is used as an explosive agent. How
many moles are there if we have 105.66 grams of potassium
permanganate?
Answers
Answer:
0.67mole
Explanation:
Given parameters:
Mass of potassium permanganate = 105.66g
Unknown:
Number of moles = ?
Solution:
To find the number of moles of the given compound;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of KMnO₄ = 39 + 55 + 4(16) = 158g/mol
Number of moles = [tex]\frac{105.66}{158}[/tex] = 0.67mole
How many atoms are in 12 moles of silver?
Answers
Answer:
NA=72.264x1023
Explanation:
I got you
Describe a method to investigate how the temperature changes when
different masses of ammonium nitrate are dissolved in water.
You do not need to write about safety precautions.
(6marks)
Answers
Answer:
Decrease temperature with increase in ammonium nitrate concentration.
Explanation:
The temperature changes when different masses of ammonium nitrate are dissolved in water because the ammonium nitrate takes energy from the surrounding water environment for the breaking of ionic bonds as a result the temperature of water decreases. When more concentration of ammonium nitrate is added to water, more decrease occur in temperature of water and the water becomes cold.
Hotness or a cold state of a substance or a solution is measured physically by temperature. It is measured by a device called a thermometer and can be in the form of Kelvin, degree Celsius or degree Fahrenheit.
Decreasing the temperature with an upsurge in the ammonium nitrate concentration can be used in determining the change in the temperature.
The change can be explained as:The alteration in temperature can be seen after adding more ammonium nitrate with various concentrations to the water.Ammonium nitrate accepts energy from the water present in its surrounding solution for splitting the ionic bonds present.This energy acceptance from water reduces the temperature of the water and with the increase in concentration lowers the water temperature more.Therefore, increased concentration reduce temperature.
Learn more about temperature and here:
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Definition surface water
Answers
Answer:
Surface Water - water that collects on the surface of the ground. Hope it helped!
Answer: surface water is when water is located of top of the Earth for example rivers, creeks, and wetlands.
pls helppp
How many energy must be absorbed by 150.0 grams of water to raise it's temperature by 50.00°C?
Answers
The heat absorbed to raise temperature : Q = 31350 J
Further explanationGiven
m = mass = 150 g
Δt = Temperature difference : 50 °C
Required
Heat absorbed
Solution
Heat can be formulated
Q = m.c.Δt
The specific heat of water = c = 4.18 J/g °C
Input the value :
Q = 150 x 4.18 x 50
Q = 31350 J