How many molecules are there in 42 grams of AIF3
Answer:
The correct answer is - 3.012×10^23 molecules
Explanation:
The number of molecules is present in any mole of an element or compound are the same. To find the molecules you need to multiply the number of the moles of the compound by Avogadro's number:
Moles are calculated from the molecular weight, for AlF3
= 26.98 + 3×19
= 26.98 + 57
= 83.98
Then moles in 42 grams:
= 42/83.98
= 0.5001190 moles
Now the number of molecules = moles*Avogadro's number
= 0.500110×6.022×10^23
= 3.011×10^23 molecules
4. How many Carbon atoms are present in 1.00 mole of methane, CH,?
6.02 x 1025
o
3.01 x 1023
0
6.02 x 1023
o
O
12.04 x 1023
0
Answer: 6.02*10^23
Explanation:
1 mole of anything is 6.02*10^23
1 atom C per CH4
Two asteroids (rock) are flying toward earth. One rock has a mass of 1000 kg and the other rock has a 2000 kg. Which rock has a greater gravitational attraction to earth?
Answer:
The rock which has 2000kg to earth
Answer:
1000kg rock has a greater gravitation
A weather balloon contains 59.5 L of helium at sea level, where the atmospheric pressure is 1 atm. The balloon is released from a 4000m mountain top where the pressure is 0.609atm. What is the volume of the balloon when it is released?
Answer:
97.7 L
I found the answer on some website and I got it right after turning it in.
So I’m in science and it says “The three major areas of professional careers are I have no idea what to put can somebody please help me
Answer:
I’m getting 1 hour and 50 minutes
Explanation:
Answer:
its Teaching, research, design.
Explanation:
hope this helps :)
Which compound is formed from its elements by an
exothermic reaction at 298 K and 101.3 kPa?
Answer:
H2O(g) (negative)
Explanation:
2H2O = 2H2 +O2
If 30mL of hydrogen are produced in above reaction, how many mL of oxygen are produced? Please show work.
Answer:
15 mL of O₂.
Explanation:
The balanced equation for the reaction is given below:
2H₂O —> 2H₂ + O₂
From the balanced equation above,
2 mL of H₂O reacted to produce 2 mL of H₂ and 1 mL of O₂.
Next, we shall determine the volume of H₂O needed to produce 30 mL of H₂. This can be obtained as follow:
From the balanced equation above,
2 mL of H₂O reacted to produce 2 mL of H₂.
Therefore, 30 mL of H₂O will also react to produce 30 mL of H₂.
Thus, 30 mL of H₂O is needed for the reaction.
Finally, we shall determine the volume of O₂ produced from the reaction. This can be obtained as follow:
From the balanced equation above,
2 mL of H₂O reacted to produce 1 mL of O₂.
Therefore, 30 mL of H₂O will react to produce = (30 × 1)/2 = 30/2 = 15 mL of O₂.
Thus, 15 mL of O₂ were produced from the reaction.
Given the Punnett Square above, with Y=dominant yellow allele and y= recessive green allele, what is the probability of an offspring plant having a green phenotype?
Question 5 options:
25% green phenotype
50% green phenotype
75% green phenotype
100% green phenotype
Answer:
50 percent
Explanation:
Considering one heterozygous parent and a homo-zygous recessive parent, the probability of an offspring plant having a green (recessive) phenotype is 50 percent (50%).
What is a Punnett square?A Punnet square is a diagram used to represent the gametic combination that will give rise to a given genotype/phenotype.
In this case, one parent is heterozygous (genotype Yy, carrier of the recessive allele), whereas the other parent is recessive homo-zygous (genotype yy).Here, the Punnett square is equal to:Y y
y 1/4 Yy 1/4 yy
y 1/4 Yy 1/4 yy
In conclusion, considering one heterozygous parent and a homo-zygous recessive parent, the probability of an offspring plant having a green (recessive) phenotype is 50 percent (50%).
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A weather balloon has at 27.0 C , 1.00 atm, with an initial volume of 2.00 liters is released into the atmosphere where the temperature is -23.0 C and the pressure is 0.500 atm.
Answer:
3.41
Explanation:
(1.00atm) (2.00 L) /(27.0C) = (.500atm) (x)/ (-23.0C)
This is how you set it up because P1V1/T1 = P2V2/T2.
Then you can cross multiple, all units except Liters will cancel and you can solve for x and have your answer.
You have a 50.00 gram sample of a compound whose molecular weight is 180.156. On decomposition, the weights of
the component elements are 20.00 grams of carbon, 3.36 grams of hydrogen, and 26.64 grams of orygen,
The molecular formula for the compound is c o
Answer:
C6H12O6
Explanation:
Had the same question and it said it was the right answer :)
You have a 50.00 gram sample of a compound whose molecular weight is 180.156. On decomposition, the weights of the component elements are 20.00 grams of carbon, 3.36 grams of hydrogen, and 26.64 grams of oxygen, The molecular formula for the compound is C₆H₁₂O₆.
What is molecular formula ?
The term molecular formula is defined as an expression that defines the number of atoms of each element in one molecule of a compound.
A molecular formula tells us which atoms are present in a molecule and how many of each type of atom are present. When there is only one atom of a given type, no subscript is used.
Molar mass of carbon is 12 grams per mole.
Molar mass of hydrogen is 2.016 grams per mole.
Molar mass of oxygen is 16 grams per mole.
Molecular weight of compound = 180.156
= 12 × 6 + 2 × 12 + 16 × 6
= 72 + 24 + 96
= 180
So, compound is C₆H₁₂O₆
Thus, The molecular formula for the compound is C₆H₁₂O₆.
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How much energy is required to heat up a Styrofoam cup from 25oC to 40oC? The mass of the cup is 20 grams and the specific heat capacity of Styrofoam is 1.1 J/(g *oC).
Answer:
Q = 440 J
Explanation:
Given data:
Heat required = ?
Initial temperature = 25°C
Final temperature = 40°C
Mass in gram = 20 g
Specific heat capacity = 1.1 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 40°C - 20°C
ΔT = 20°C
Q = 20 g×1.1 J/g.°C × 20°C
Q = 440 J
How many grams are contained in 19.7 moles of Copper (III) Hydroxide?
Answer:
1912.1893280000002 or rounded to the nearest tenth is, 1912.19
Explanation:
lithium sulfate + magnesium nitrate =
Answer:
Magnesium Sulfate + Lithium Nitrate
Explanation:
Magnesium Nitrate + Lithium Sulfate = Magnesium Sulfate + Lithium Nitrate.
The complete word equation for this reaction is:
lithium sulfate + magnesium nitrate = lithium nitrate+ magnesium sulfate
Balanced chemical reaction:When lithium sulfate reacts with magnesium nitrate, lithium nitrate and magnesium sulfate are formed. This type of reaction is also known as a double displacement reaction. In this type of reactions ions of the salts get exchanged to form the new salts.
Word equation:
lithium sulfate + magnesium nitrate = lithium nitrate+ magnesium sulfate
Chemical equation:
[tex]Li_2SO_4+ MgNO_3---- > LiNO_3+ MgSO_4[/tex]
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starting with the idea of isostasy and ending with plate tectonics, explain how scientists understanding of the earth's crust has changed
Plate Tectonics is the study of the movement and changes in the rocks that make up the earth's crust. Isostasy is the equilibrium in the earth's crust maintained by a flow of rock material in the asthenosphere.
The concept behind pre-continental drift was that in addition to the pressure of contraction, isostatic adjustments also caused the crust's heavier portions to sink and its lighter portions to rise. It was believed that the Earth's interior was a viscous fluid that could support this rising and sinking.Wegener put up the theory that continents can move in 1915 based on fossil data, how coasts appeared to fit together, and other traits, but it was not well received at the time.He noticed that rock ages, and mountain belts match up across the boundaries of continents if you put the continents back together as the "jigsaw puzzle fit" proposes.On continents that are currently divided by water, fossils of identical terrestrial flora and animals have been discovered.New data from the ocean floor, including topography and rock magnetism, played a major role in the development of plate tectonic theory in the 1960s.On the basis of symmetrical patterns, seafloor spreading was hypothesized as a mechanism to propel the migration of the continents.Hence this led to scientists understanding of the earth's crust has changed.
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5. As a sample of matter is heated, its particles *
O A are unaffected
O B. move more quickly
O C. move more slowly
D. stop moving
Answer:
B. move more quickly
Explanation:
As a sample of matter is heated, we know that the particles begins to move more quickly.
This is because the temperature of a substance is directly proportional to the average kinetic energy of a system.
As the temperature increases, the body gains more kinetic energyThis is translated to the particles of the medium. Then they begin to move quickly and very fast enough.Convert 2.345 centimeters cubed to inches cubed. 1inch = 2.54cm
Answer:
0.92322835
Explanation:
0.92322835 rounded= 0.9 or 0.92
2.345 centimeters cubed is equal to 0.1431 inches cubed.
Units of volume are used to measure the amount of space occupied by an object or substance. Volume is a three-dimensional quantity and is typically expressed in cubic units. Some common units of volume include:
Cubic Meter (m³): This is the SI unit of volume and represents the volume of a cube with sides measuring one meter.Cubic Centimeter (cm³): This is a smaller unit of volume often used for measuring the volume of small objects or substances. It is equal to the volume of a cube with sides measuring one centimeter.Liter (L): The liter is a commonly used unit of volume in everyday life. It is equal to one cubic decimeter or 1,000 cubic centimeters.Milliliter (mL): The milliliter is a smaller unit of volume often used for measuring liquids or small quantities. It is equal to one-thousandth of a liter or one cubic centimeter.Other units of volume, such as gallons, cubic feet, and ounces, are also used in specific contexts or regions. It is important to use appropriate conversion factors when converting between different units of volume.
1 inch = 2.54 cm.
1 cm = 1/2.54 inches
(1 cm)³ = (1/2.54 inches)³
1 cm³ = (1/2.54)³ inches³
2.345 cm³ = 2.345 × [(1/2.54)³] inches³
2.345 cm³ ≈ 0.1431 inches³ (rounded to four decimal places)
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20 POINTS! SAVE ME PLS!
Which ion below is fluorine most like to form? A) F+1 B) F+2 C) F-1 D) F-2
Perform the following conversions. Show your work and give answer in scientific
notation with correct units.
4.390 m → dm
4.39 x 10^1 dm
we need to change the m to dm first then make it in scientifiv notation
How many moles are in 4.85 x 10^25 atoms of carbon?
Answer:
4.85 x 10^25
Explanation:
thats what i was told by a calculator
How many moles are there in 36.0 grams of water?
Answer:
There are 4 moles of hydrogen atoms in 36 grams of water,
Explanation:
helppp nowwww plsss
Answer:
The answer is number 2.
Explanation:
Prepare 800 mL of 2M sodium chloride. How many grams of NaCl needs to be dissolve in a 800 mL distilled water?
Answer:
93.6 g of NaCl.
Explanation:
We'll begin by converting 800 mL to litre (L). This can be obtained as follow:
1000 mL = 1 L
Therefore,
800 mL = 800 mL × 1 L / 1000 mL
800 mL = 0.8 L
Next, we shall determine the number of mole of NaCl in the solution. This can be obtained as follow:
Molarity = 2 M
Volume = 0.8 L
Mole of NaCl =?
Molarity = mole / Volume
2 = mole of NaCl / 0.8
Cross multiply
Mole of NaCl = 2 × 0.8
Mole of NaCl = 1.6 moles
Finally, we shall determine the mass of NaCl needed to prepare the solution. This can be obtained as follow:
Mole of NaCl = 1.6 moles
Molar mass of NaCl = 23 + 35.5
= 58.5 g/mol
Mass of NaCl =?
Mole = mass /Molar mass
1.6 = Mass of NaCl / 58.5
Cross multiply
Mass of NaCl = 1.6 × 58.5
Mass of NaCl = 93.6 g
Therefore, 93.6 g of NaCl is needed.
93,6 grams of NaCl is needed to prepare a 800ml of 2M sodium chloride.
Molar concentrationIn a 2M solution, there are 2 moles of the substance per 1 liter, that is, in 800 ml we have:
[tex]\frac{2 mol}{x mol} =\frac{1000 ml}{800ml}[/tex]
[tex]x = 1.6 mol[/tex]
Thus, 1.6 mol of NaCl is needed to prepare the solution.
Mass calculationTo calculate the mass in an amount of moles, we use the molar mass, so that:
[tex]MM_{NaCl}= 58.5g/mol[/tex]
[tex]m = MM \times mol[/tex]
[tex]m = 58.5 \times 1.6[/tex]
[tex]m = 93.6g[/tex]
So, 93,6 grams of NaCl is needed to prepare a 800ml of 2M sodium chloride.
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How many grams of aluminum in required to produce 17.5 g of hydrogen
Mass of Aluminum = 157.5 g
Further explanationGiven
17.5 g of Hydrogen
Required
Mass of Aluminum
Solution
Reaction
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
mol Hydrogen :
= mass : molar mass
= 17.5 g : 2 g/mol
= 8.75
From the equation, mol Al :
= 2/3 x mol H₂
= 2/3 x 8.75
= 5.83
Mass Al :
= 5.83 x 27 g/mol
= 157.5 g
What must be satisfied for a hypothesis to be useful?
A. It must be theoretical.
B. It must be observable.
C. It must be based on scientific law.
D. It must be testable.
Which of the following correctly describes molecules of two different gases if they are at the same temperature and pressure?
CA. They must have the same mass.
CB. They must have the same velocity
CC. They must have the same average kinetic energy
CD. They must have the same average potential energy
Answer: C. They must have the same average kinetic energy.
Explanation: I got it right
20 POINTS PLS SAVE ME!!!!
If an element is a metal, is it more likely to ________ its valence electrons when it bonds. When it does that, it will become _________.
A. add to, a cation
B. lose, an anion
C. add to, an anion
D. lose, a cation
Answer:
Uhhh d ?
Explanation:
The analysis of data leads to _____.
A. theories
B. variables
C. hypotheses
D. conclusions
Answer: D, Conclusions
Explanation: Gradpoint
Water in the atmosphers is in its gas form and is called water vapor. Where does most of the water vapor in the atmosphere
evaporate from?
Answer:
Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation.
convert 2.39 x 1022 molecules of water into moles of water
Answer:
[tex]0.0397\ \text{mol}[/tex]
Explanation:
Number of molecules of water = [tex]2.39\times 10^{22}[/tex]
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Number of moles is given by
[tex]\dfrac{2.39\times 10^{22}}{6.022\times 10^{23}}[/tex]
[tex]=0.0397\ \text{mol}[/tex]
The number of moles of water is [tex]0.0397\ \text{mol}[/tex].
Please help!!!!!!!!
Alyssa has four different subjects oil water sand and air. she would like to fill four Identical balloons with these materials until all of the balloons have the same mass. Which balloon would take up the most space
Answer:
air
Explanation:
The material that will take up the most space is air. Air and most gases have no definite volume.
They simply take up shape and volume of any medium they are introduced into.
The attribute of no fixed shape and volume sets gases apart from other matter. The air will fill the entire space of the balloon and it will have the most volume. Oil, water and sand have fixed volume that is predetermined.Answer:
Air
Explanation:
The material that will take up the most space is air. Air and most gases have no definite volume.
They simply take up shape and volume of any medium they are introduced into.
The attribute of no fixed shape and volume sets gases apart from other matter.
The air will fill the entire space of the balloon and it will have the most volume.
Oil, water and sand have fixed volume that is predetermined.