moles of Na produced = 6 moles
Further explanationGiven
Reaction
2Na3N---> 6Na+N
6 moles of Na3N
Required
moles of Na
Solution
I don't really understand the reaction in the problem, all I know is the decomposition reaction of sodium azide NaN3
2NaN₃ → 2Na + 3N₂
The reaction coefficient shows the mole ratio of the compounds involved in the reaction
From the equation(balanced), mol ratio of Na : NaN₃ = 2 : 2, so mol Na :
= 2/2 x moles NaN₃
= 2/2 x 6 moles
= 6 moles
c) how many atoms of O are in 45.0g of C12H22011
Answer:
6.022×1023 oxygen atoms
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
Diagram electron configuration of hydrogen (1), sodium (11), K (19) what do they have in common?
They can only hold 2 electrons in the first outershell
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 much heat is necessary to change 10.0 g of water from 20 degrees celsius to 75 degrees celcius?
Answer: 29.6
Explanation:
The amount of heat is necessary to change 10.0 g of water from 20 degrees celsius to 75 degrees Celcius 50 J ( joules).
what is heat?Heat is the transfer of hot energy in the form of potential energy from one source of an object to another source of an object through a medium for the object and the unit of heat is joules.
The amount of heat can be calculated by a formula,
C = Q / ΔT × m
m = mass, Q = total heat, ΔT is changing in temperature.
substituting the value in the equation,
C = 75/ (75-20) 10
C = 50 J ( joules)
Therefore, 50 J ( joules) is the amount of heat necessary to change 10.0 g of water from 20 degrees Celsius to 75 degrees Celcius.
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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 :)
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
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
What are zebra mussels?
Answer:
The zebra mussel is a small freshwater mussel.
helppp nowwww plsss
Answer:
The answer is number 2.
Explanation:
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
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].
Scientists currently use radioactive isotopes in various field. Some radioactive isotopes are used to _____.
•power iasers
•develop new antibiotics
•clone organisms
•date ancient bones
[tex]\huge{\textbf{\textsf{{\color{pink}{An}}{\red{sw}}{\orange{er}} {\color{yellow}{:}}}}}[/tex]
ur answer is:-
date ancient bones
Scientists currently use radioactive isotopes in various field. Some radioactive isotopes are used to date ancient bones.
What are isotopes?Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.
Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.
They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable
Unstable isotopes are radioactive and are called as radioisotopes.Some of these isotopes are man -made and hence also called as artificial isotopes.Every element has an isotope which is either man-made or natural .
Many properties of isotopes depend on mass which is measured in atomic mass unit. The difference in actual mass and mass number is called mass defect.
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Which compound is formed from its elements by an
exothermic reaction at 298 K and 101.3 kPa?
Answer:
H2O(g) (negative)
Explanation:
How many grams in 65 moles of NaCl?
Answer:0.899076923
Explanation:
Na = 22.99
Cl =35.45
Add them together u get the molar mass of NaCl =58.44
Divide 58.44 by 65
U get 0.899076923
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
The distance time graph for four objects is shown below:
Which objects is moving at constant speed?
A. Object A
B. Object B
C. Object C
D. Object D
Answer:
Option A
Explanation:
Remember constant means staying the same so in order to remain constant on the graph the line has to keep going up remaining the same pace. Which means the answer is option A or "Object A." The graph consists of a line going up at a constant speed without any bends or turns which all the other options consist of.
Hope this helps.
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Answer:
Barb tested the streak and luster.
Explanation:
Pls mark brainliest
Answer:
Mineral size and luster.
Explanation:
how do people and water affect each other?
Answer:
is this for science or another class?
Answer:
Water is peace. They include sedimentation, pollution, climate change, deforestation, landscape changes, and urban growth. ... Each type of change to a landscape will have its own specific impact, usually directly on natural ecosystems and directly or indirectly on water resources.
Explanation:
Which organelle packages materials and distributes them throughout the cell?
lysosome
chloroplast
Golgi body
cell membrane
Pleaseee!!
Answer:
golgi body
Explanation:
trust meeeeeeeeeThe speed of light in a vacuum is 2.998 x 108 m/s. How long does it take for light to circumnavigate the Earth, which has a circumference of around 24,900 miles? Do not enter "seconds" as part of your answer. Watch your Sig Figs!
Answer:
0.13 s
Explanation:
We'll begin by converting 24900 mile to metres (m). This can be obtained as follow:
1 mile = 1609.344 m
Therefore,
24900 mile = 24900 mile × 1609.344 m / 1 mile
24900 mile = 4.01×10⁷ m
Finally, we shall determine the time taken for light to circumnavigate the Earth, this can be obtained as follow:
Distance = 4.01×10⁷ m
Speed = 2.998×10⁸ m/s
Time =?
Speed = distance / time
2.998×10⁸ = 4.01×10⁷ / time
Cross multiply
2.998×10⁸ × time = 4.01×10⁷
Divide both side by 2.998×10⁸
Time = 4.01×10⁷ / 2.998×10⁸
Time = 0.13 s
Thus, it will take 0.13 s for light to circumnavigate the Earth.
What is the density of a rock that has a mass of 35 grams and a volume of 7.0 g/mL
Answer: 5
Explanation: Density equals mass divided by volume (D=M/V). Thus, 35/7=5.
The density of a rock : ρ = 5 g/cm³
Further explanationGiven
mass = 35 g
volume = 7 cm³
Required
The density
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Input the value :
ρ = 35 g : 7 cm³
ρ = 5 g/cm³
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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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.
How many liters are in 3.45 moles of oxygen gas at STP?
A) 2.08 x 10 24 L
B) 110.4 L
C) 77.28 L
D) .15 L
Answer:
22.4L of one mole of any gas
or you can use PV=nRT
3.45*22.4=77.28
Explanation:
Pls help me I beg you
Answer:
Es la c
Explanation:
Espero que te ayude
Answer:
D. Nathan applies enough force through pushes to move the piano
Explanation:
What moves the piano is a net force that is applied through the effort of Nathan on the instrument.
Force is a pull or push on a body.
When force is applied on a body, it causes the state of motion of the body to change.
Therefore, if a body has a net force greater than zero, the body will in likewise begin to move. As Nathan pushes on the piano, it will eventually move.
Students want to replace the material that connects the battery and the bulb in the circuit. Which material would be the best choice?
A Copper, because it is a conductor
B String, because it is flexible.
C Plastic, because it is an insulator.
D Glass, because light energy can move through it.
Answer:
a is ok
Explanation:
if they had gold it would be better but no
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.
ASAP , 8.81 g Carbon
Molar Mass: 1362.5 g/mol
91.2 g Chlorine
What is the empirical formula and molecular formula ?
The empirical formula : C₂Cl₇
The molecular formula : C₁₀Cl₃₅
Further explanationGiven
8.81 g Carbon
91.2 g Chlorine
Molar Mass: 1362.5 g/mol
Required
The empirical formula and molecular formula
Solution
Mol ratio :
C = 8.81 g : 12.011 g/mol =0.733
Cl = 91.2 g : 35,453 g/mol = 2..572
Divide by 0.733
C : Cl = 1 : 3.5 = 2 : 7
The empirical formula : C₂Cl₇
(The empirical formula)n = the molecular formula
(C₂Cl₇)n = 1362.5
(2x12.011+7x35.453)n=1362.5
(272.193)n=1362.5
n = 5
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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