Answer:
A) [tex]6.5\times 10^{23}\ \text{molecules}[/tex]
Explanation:
m = Mass of water = 38.9
M = Molar mass of water = 18 g/mol
[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
The reaction of electrolysis would be
[tex]2H_2O(l)\rightarrow 2H_2(g)+O_2(g)[/tex]
Number of moles of [tex]H_2O[/tex]
[tex]n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}[/tex]
From the reaction it can be seen that 2 moles of [tex]H_2O[/tex] gives 1 mole of [tex]O_2[/tex]
So, number of moles of [tex]O_2[/tex] produced is
[tex]\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}[/tex]
Number of molecules
[tex]1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}[/tex]
So, [tex]6.5\times 10^{23}\ \text{molecules}[/tex] of oxygen is produced.
1. Air contains mostly nitrogen (78%) and oxygen (21%). It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids). Write a brief explanation about why air is a mixture, whether it is homogeneous or heterogeneous, and how it can be separated into its components.
Answer:
It also contains other gases, including carbon dioxide and helium, and various pollutants (both gases and solids).
(HELP FAST )What occurs when a pure liquid substance is cooled?
Answer:
The particles in the substance become less active
Your weight changes if you travel to the moon because _____.
Answer:
1/6 of your weight on Earth
Answer:
the amount of the force of gravity changes
How many moles of H2O are formed from the combustion of 5.0 mol CH4
Question:
How many moles of H2O are formed from the combustion of 5.0 mol CH4
Answer:
For any balanced chemical reaction, whole numbers (coefficients) are used to show the quantities (generally in moles ) of both the reactants and products. For example, when oxygen and hydrogen react to produce water, one mole of oxygen reacts with two moles of hydrogen to produce two moles of water.
my grades are as the following;
86.7%
82.1%
77.7%
88.3%
69.2%
what is my gpa im having trouble trying to find out
Answer:
try a calulator online just go to g.oogle and type in gpa calculator
what so ammonia and bleach make
blease help i know its something dangerous but I'm not sure and dont want to accidentally kill my family
Answer:
Mixing bleach and ammonia will create a toxic chloramine gas. Exposure to chloramine gas can cause irritation to your eyes, nose, throat, and lungs .
if you do accidentally mix bleach and ammonia, get out of the contaminated area and into fresh air immediately.
hope this help u ☆
what geologic process directly forms beaches on the shores of the bay?
The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
What is sediment deposition?The Deposition refer to the laying down of sediment that should be carried by wind, where the water should be flowing down or there is the sea or ice. Sediment could be transported just like the pebbles, sand ,and mud, or as salts mix in the water.
Therefore, The geologic process that directly forms beaches on the shores of the bay should be considered as the sediment deposition.
Learn more about geologic here: https://brainly.com/question/3101097
Ciao, adios, I'm done (I'm done)
Ciao, adios, I'm done
Done (I'm done)
Ciao, adios, I'm done
And now you take her out in your fancy car
And make out in the rain
And when she rings you up
She know where you are
But I know differently
Now she sings along when you play guitar
Making brand new memories
Hope you treat her better than you treated me
Answer:
The answer is B.xd
Explanation:
Answer:
Ciao Adios by Anna-Marie
Explanation:
ooof I like that song
Why does oxygen bond with hydrogen to make water?
Group of answer choices
A) Because oxygen only has 6 electrons in its outer shell and it wants 8. It binds with 2 hydrogens because each hydrogen atom has 1 electron in its outer shell.
B) Because oxygen only has 8 electrons in its outer shell and it can take 4 more. It binds with 2 hydrogen atoms because each hydrogen atom can carry 2 electrons in its outer shell.
C) Because oxygen only has 2 electrons in its inner shell and it needs 6 more to make 8. It binds with 6 hydrogens to fill up its shell.
D) No answer text provided.
answer: c
because if you really picture it and look at each of them carefully it is c
Question 5
2 pts
Which regions did the Byzantine emperor Justinian conquer in an attempt to
revive the Roman Empire?
North Africa and Persia
North Africa and the Italian Peninsula
Persia and Egypt
Gaul and the British Isles
Answer:
I believe it's ... North Africa and the Italian Peninsula
Aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.
The question is incomplete, the complete question is;
In this stoichiometry problem, determine the percentage yield:
Excess aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.
Answer:
80%
Explanation:
The reaction equation is;
2Al(s) + 3NiSO4(aq) --------> Al2(SO4)3 + 3Ni(s)
Since Al is in excess then NiSO4 is the limiting reactant.
Number of moles in 464 g of NiSO4 = mass/ molar mass
Molar mass of NiSO4 = 155 g/mol
Number of moles = 464g/155g/mol = 2.99 moles
Number of moles of Al2(SO4)3 = mass/molar mass
molar mass = 342 g/mol
Number of moles = 274g/342g/mol = 0.8 moles
From the reaction equation;
3 moles of NiSO4 yields 1 mole of Al2(SO4)3
2.99 moles of NiSO4 yields 2.99 * 1/3 = 1 mole of Al2(SO4)3
% yield = actual yield/ theoretical yield * 100/1
actual yield = 0.8 moles of Al2(SO4)3
Theoretical yield = 1 mole of Al2(SO4)3
% yield = 0.8/1 * 100 = 80%
In this exercise we have to use the knowledge of reaction to calculate the required percentage, in this way we find that:
[tex]80\%[/tex]
The reaction equation is;
[tex]2Al(s) + 3NiSO_4(aq) \rightarrow Al_2(SO_4)_3 + 3Ni(s)[/tex]
Since Al is in excess then NiSO4 is the limiting reactant. Now knowing that the data informed is:
Number of moles in 464 g of NiSO4 Molar mass of NiSO4 = 155 g/mol Number of moles = 2.99 moles Number of moles of Al2(SO4)3 Molar mass = 342 g/mol Number of moles = 0.8 moles
From the reaction equation;
[tex]\% yield = actual\ yield/ theoretical\ yield * 100/1\\\% yield = 0.8/1 * 100 = 80%[/tex]
See more about reaction at brainly.com/question/3664113
How much energy does it take to freeze 30.0g of H2O at 0 oC?
Energy to freeze : 10020 J
Further explanationGiven
mass of H₂O = 30 g
Required
Energy to freeze
Solution
Reaction
H₂O(l) ⇒ H₂O(s)
The heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Lf = latent heat of fusion (for water/ice = 334 J/g)
Then heat to freeze :
[tex]\tt Q= 30\times 334=10020~J[/tex]
Name the three stress forces that cause changes in Earths crust. Explain how each type of force affects rock.Identify the type of fault that each force produces. This is science i couldnt find a science thing
Answer:
Shear
Tension
Compression
Explanation:
The 3 stress forces are;
-shear
-tension
-compression
1) Shear is the stress force that pushes back a mass of rock in two opposite directions which in turn will produce strike - slip faults.
2) Tension is the stress force that pulls on the crust thereby stretching in a manner that it becomes thinner at its middle which in turn will produce normal faults.
3) Compression is the stress force that makes rocks squeeze until they fold or break and this will in turn produce reverse faults.
HELP! ASAP! WILL MARK BRAINLIEST!!
A metal atom that loses electrons is called a/an _______.
Answer:
It is called ions
Explanation:
Metal atoms lose some of their valence electrons through a process called oxidation, resulting in a large variety of ionic compounds including salts, sulfides, and oxides. The properties of metals, combined with the chemical action of other elements, results in the transfer of electrons from one atom to another.
Answer:
its called an ion
Explanation:
an ion is an electrically charged atom
What is the volume of a flask that contains 0.730 moles of Nitrogen at a pressure of 698 mmHg and a temperature of 35.4°C?
Answer:
V = 20.1 L
Explanation:
Given data:
Volume of flask = ?
Number of moles of nitrogen gas = 0.730 mol
Pressure = 698 mmHg (698/760 = 0.92 atm)
Temperature = 35.4°C
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
35.4+273 = 308.4 K
by putting values,
0.92 atm× V = 0.730 mol ×0.0821 atm.L/ mol.K × 308.4 K
V = 18.48 atm.L / 0.92 atm
V = 20.1 L
what are the 10 properties of metals
Explanation:
Lustrous (shiny)
Good conductors of heat and electricity.
High melting point.
High density (heavy for their size)
Malleable (can be hammered)
Ductile (can be drawn into wires)
Usually solid at room temperature (an exception is mercury)
Opaque as a thin sheet (can't see through metals)
nonmetallic elements form ions by ____________
valence electrons to complete their outer shell.
gaining or losing?
Answer:
you know it is what it is☠
Explanation:
Nonmetallic elements form ions by valence electrons to complete their outer shell. The valence electrons an element has in its outer shell, the easier it is to complete. The electron shells an element has, the easier it is to fill its outermost shell.
Which of the following is an example of a physical change?
A) pouring hydrogen peroxide (H202) on a cut, causing oxygen (02) bubbles to form
B) mixing together flour, sugar, salt, eggs and butter to make cookies
c) baking a birthday for your best friend
D) enzymes within the digestive system breaking down the lunch you just ate
Answer:
B! i just learned this last week lol!
Explanation:
hope this helps♡♡
what is the charge of an anion
Answer:
negative charge
Explanation:
An anion has more electrons than protons, consequently giving it a net negative charge.
hope this helps, pls mark brainliest :D
where is the mass of an atom located?
A student places four identical cells into four different liquids. Over time which cell will look the smallest WXY or Z
Answer: W
Explanation:
The cell in liquid W will look the smallest out of the four because of Osmosis.
Osmosis is a process by which water molecules move from an area of relatively higher concentration of water to an area with a relatively lower concentration through a selectively permeable membrane(cell membrane).
With W being saltier than the cell, water molecules will move from the cell to liquid W to balance the concentrations inside and outside the cell which will lead to the cell in W being smaller.
The empirically formula for a compound is CH3. If the multiplier is 2, what is the molecular formula?
Answer:
C₂H₆
Explanation:
Here,
The Empirical Formula is CH₃
Now, 2 × CH₃ = C₂H₆
Thus, The Molecular Formula of CH₃ is C₂H₆
-TheUnknownScientist
A can of cola contains approximately 240 calories. If you consume two cans of cola each day for one week, approximately how many calories did you consume from cola?
Select one:
a)3,400 calories
b)70 calories
c)1,700 calories
d)480 calories
Answer:
[tex]\boxed{\pink{\sf Option \ (a) \ is \ Correct .}}[/tex]
Explanation:
Given that , A can of cola contains approximately 240 calories. And we consume two cans of cola each day. So , calories consumed in one day
[tex] = 2 \times 240 calories \\\\= 480 calories [/tex]
In a week there are seven days. So calories consumed in a week
[tex]= 7 \times 480 calories \\\\= 3360 calories [/tex]
Which is approximately equal to 3,400 calories.
Hence option (a) is correct .Which of the following elements would be in the same group or family?
A. K, Ca, Sc
B. Se, Br, Kr
C. K, Na, Li
D. Al, Ge, Sb
Answer:
d
Explanation:
A student found the percent composition of CO to be 50% C and 50% O. What did the student do Incorrectly? What is the percent composition of CO?
Answer:
O = 57.14%
C = 42.86%
Explanation:
First of all we will calculate the molar mass of CO.
C = 12 g/mol
O = 16 g/mol
CO = 12 g/mol + 16 g/mol
CO = 28 g/mol
Percent composition:
C = (12 g/mol /28 g/mol ) × 100
C = 42.86%
O = (16 g/mol /28 g/mol ) × 100
O = 57.14%
Answer:
it should be 42.86% carbon and 57.14% oxygen
C = 12
O = 16
CO = 12 + 16
CO = 28
C = (12 /28 ) × 100
C = 42.86%
O = (16 /28 ) × 100
O = 57.14%
If energy absorbed is greater than energy emitted does temperature increase or decrease?
Answer:
the decrease is the answer to the question
True or false. As a wave travels through a given material its velocity changes.
Answer:
true
Explanation:
Answer:
false
Explanation:
i took the test and got it right
The salt in ocean water comes from all of the following EXCEPT
A
eroding land.
В.
melting glacial ice.
C
volcanic emissions.
D
reactions on the sea floor.
Answer:B
Explanation:
Had the same test years ago
The salt in ocean water comes from various sources such as the volcanic emissions, land eruption, ionic reactions in sea floor etc. but not from the melting of glacial ice.
What is salt in ocean water?Salt in ocean water is the ionic compound NaCl that we are using as the table salt to add in foods. The Na+ and Cl- ions are reaching to the ocean through various geographical process.
One of them is volcanic eruptions by in the tectonic plate boundaries. Volcanoes containing sulfur and chlorine atoms which are falling to the ocean. Similarly land eruption also result in salt formation in oceans.
Land rocks contains minerals such as limestone, epsom salt, and table salt. Weathering process break down these minerals and dissolve in water. Melting of glacial ice increases the water level but does not make water salty.
To find more on weathering, refer here:
https://brainly.com/question/14426457
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G. Science:
In the following chemical reactions which are the reactants? iron+ sulphur= iron suphide.
(a): Iron and iron sulphide
(b): iron and sulphur
(c): iron, sulphur, and iron sulphide
(d): sulphur and iron sulphide
how do people start alcohol consumption
Answer:
Explanation:Due to the mental pressure,
Due to peer pressure,
Lack of love and affection from the family members.
Influence from the T.V advertisement.