Given the following reaction, how many molecules of H2O will be formed from 200.0g of NaOH?
2 NaOH + H2SO4 -> 2 H2O + Na2SO4
Answer:
30.11×10²³ molecules
Explanation:
Given data:
Mass of NaOH = 200.0 g
Number of molecules of water formed = ?
Solution:
Chemical equation:
2NaOH + H₂SO₄ → 2H₂O + Na₂SO₄
Number of moles of NaOH:
Number of moles = mass/molar mass
Number of moles = 200 g/ 40 g/mol
Number of moles = 5 mol
Now we will compare the moles of NaOH and H₂O.
NaOH : H₂O
2 : 2
5 : 5
Number of molecules of water:
1 mole contain 6.022×10²³ molecules
5 mol × 6.022×10²³ molecules / 1mol
30.11×10²³ molecules
You have a stock solution of HNO3 with a concentration of 4.5 x 10^-4 M. However, you need 275 ml of a 2.50 x 10^-5 M solution. How much of the stock solution will you need?
Answer:
15.28 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of stock solution (M₁) = 4.5x10¯⁴ M
Volume of diluted solution (V₂) = 275 mL
Molarity of diluted solution (M₂) = 2.5×10¯⁵ M
Volume of stock solution (V₁) needed =.?
The volume of the stock solution needed can be obtained by using the dilution formula as illustrated below:
M₁V₁ = M₂V₂
4.5x10¯⁴ × V₁ = 2.5×10¯⁵ × 275
4.5x10¯⁴ × V₁ = 0.006875
Divide both side by 4.5x10¯⁴
V₁ = 0.006875 / 4.5x10¯⁴
V₁ = 15.28 mL
Therefore, the volume of the stock solution needed is 15.28 mL
3 Aqueous copper(II) sulfate solution is placed in an
iron container and left to stand for several
days.
Which statement describes what happens?
A Atmospheric oxygen reacts with the copper(II)
sulfate to give black copper(II) oxide.
B Some fine iron particles are formed in the solution.
C The part of the container in contact with the
solution is coated with copper.
D The solution turns from green to blue.
Answer:
it will option D green to blue because iron being more reactive displaces copper from its solution
Explain, in terms of energy changes, why methane is used as a fuel.
How many moles of Ca3N2 will be produced if you react 6.3 moles of Calcium with an excess (more than you need) of Nitrogen?
3Ca + N2→ Ca3N2
a) 18.9 moles of Ca3N2
b) 6.3 moles of Ca3N2
c) 2.1 moles of Ca3N2
Answer:
C
Explanation:
For every mol of Ca3N2 produced, you will need 3 mols of Ca
So the answer can be set up using a proportion.
3/1 = 6.3 / x Cross multiply
3x = 6.3 *1 Divide by 3
3x/3 = 6.3/3
x = 2.1
The answer is C
2.1 moles of Ca3N2 will be produced if you react 6.3 moles of Calcium with an excess nitrogen. Details about stoichiometry can he be found below.
How to calculate number of moles?The number of moles of a compound can be calculated as follows:
The chemical reaction between calcium and nitrogen is given as follows:
3Ca + N2→ Ca3N2
Based on the above reaction, 3 moles of calcium forms 1 mole of Ca3N2
Hence, 6.3 moles of calcium will produce 6.3/3
= 2.1 moles of Ca3N2
Therefore, 2.1 moles of Ca3N2 will be produced if you react 6.3 moles of calcium with an excess nitrogen.
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Which type of climate does Florida have due to its latitude?
Why do atoms form bonds or why do bonds form?
Answer:
Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions
Explanation:
how many atoms of carbon or one mole of glucose
Answer:
6 carbon atoms
Explanation:
For instance, we can say that one molecule of glucose has 6 carbon atoms, or we can say, equivalently, that one mole of glucose has 6 moles of carbon atoms
Explain the different results of stress on layers of rock. Include a discussion of whether each result happens slowly or quickly.
All of the following rivers are labeled on the map above except the __________ River.
A. Danube
B. Volga
C. Lena
D. Ob
How is carbon(C)-14 is different from carbon(C)-12?
Explanation:
Carbon-12 and carbon-14 are two isotopes of the element carbon. The difference between carbon-12 and carbon-14 is the number of neutrons in each of their atoms. Atoms of both isotopes of carbon contain 6 protons. Atoms of carbon-12 have 6 neutrons, while atoms of carbon-14 contain 8 neutrons.
Please actually help me.
Thank you!
Answer:
The answer is Helium.
Explanation:
Scandium's atomic number is 21.
Sulfur's atomic number is 16
Lithium's atomic number is 3
Helium's atomic number is 2.
Therefore, the answer is Helium.
An equation that shows only the chemical formulas without
anything to indicate relative amounts is called a ______.
Answer: skeleton equation
Explanation:
"Religion and culture are also affected by the climate and topographic diversity."
Justify this statement
Answer:
In a survey of a group of people, it was found that 60 0f them have
business, 45 have government jobs, 125 have farming, 27 have business
only, 15 have government job only, 10 have business and government
job only, 5 have government job and farming only.
i) How many people have all the profession?
ii) How many people were there in a survey?
Convert 31.82 grams of ca(oh)2 to moles Convert 3.2 moles of k2so3 to grams Convert 7.25x10^23 formula units of hcl to moles Convert 46.6L of cl2 gas to moles at stp
Answer:
See explanation
Explanation:
Number of moles = given mass/molar mass
For Ca(OH)2
n= 31.82g/74g/mol= 0.43 moles
n = mass/ molar mass
Molar mass of K2SO3 = 158g/mol
mass= 3.2 × 158 = 505.6 g
1 formula unit = 6.02 × 10^23
1 mole = 6.02 × 10^23
x moles = 7.25x10^23
x = 7.25x10^23/6.02 × 10^23
x= 1.2 moles
1 mole of Cl2 occupies 22.4 L at STP
x moles of Cl2 occupies 46.6L
x = 46.6/22.4
x= 2.1 moles
ANSWER ASAP Which part of the picture shows evidence of matter scattering light waves in
many different directions?
O A. The color of the tree appears black against the sky.
O B. The image of the moon in the sky is incomplete.
OC. The image of the moon on the water's surface is distorted.
OD. The colors on the water's surface match the colors in the sky.
Answer:
The evidence of matter scattering light wave in many different directions is;
D. The colors on the water's surface match the colors in the sky
Explanation:
Light scattering is used to describe the sending of a given beam of light in many directions (by tiny particles) when the light passes through a medium, due to the disruption of the bath of the light ray as it bumps into the tiny particles
Water has the nature of absorbing the red light. The light that enters the water is scattered by the tiny particles in the water such that the blue light which is the spectrum of light water allows to pass through is reflected along with the reflection of the sky and the colors of the water surface match the colors of the sky.
Answer:
C.
Explanation:
I took the quiz
which element has two valence electrons in the s sublevel of the fourth energy level
what water has 97% of water
Answer:
ocean
Explanation:
because its easy
If something is up higher it will have ________________ potential energy.
the same
more
less
Answer:
More
Explanation:
Directions are in the picture
Convert 4.5 x 10-3 to standard Notation
Posted today at 6:30 am
1
=
Answer:
0.0045
Explanation:
Scientific notation is the way to express the large value in short form.
The number in scientific notation have two parts.
The digits (decimal point will place after first digit)
× 10 ( the power which put the decimal point where it should be)
for example 4.5×10⁻³
In standard notation
4.5 / 10³
0.0045
The expanded notation is standard notation of writing the numerical values which is normal way. The numbers are written as they are, without the power of 10.
If alcohol has a density of 0.84 g/ml, would it float or sink in a cup of water (density of 1.00 g/ml)?
Denser materials will always sink below less dense materials.
So in this case, the alcohol would float since it has a lower density.
Which material has carbon atoms interspersed with iron atoms in its molecular structure?
0 hematite
0malachite
0 bauxite
0 steel
Answer:
steel should be correct
Sodium catches on fire when it reacts with water. Which electron
configuration represents an element that reacts in a similar way?
Answer:
1s2 2s2 2p6 3s2 3p6 4s1
Explanation:
The reaction of potassium and sodium metals with water is fast and highly exothermic. So much heat is released that the metals catch fire spontaneously when added to water.
Hence, it is common to see in textbooks that sodium and potassium reacts violently with water.
When added to water, potassium burns with a purple flame.
A Punnett square is used to _______.
a
predict the genotypic and phenotypic probabilities of possible offspring
b
determine if a trait runs in a family
c
track inherited traits through many generations
d
identify organisms that are carriers of a specific trait
Answer:
your answer would be
A.predict the genotypic and phenotypic probabilities of possible offspring
Answer:
A is the correct answer
Explanation:
tell me if i got it right!
15 POINTS!!
In the South Texas Plains, the Rio Grande River flows along the southern border of the state. The Rio Grande shapes the region through the processes of weathering, erosion, and deposition. Which of the following is an example of the river forming a depositional feature?
A.
As the water's speed decreases along the inside edge of a curve, sediment is laid down to form a point bar.
B.
As the water flows along the outside edge of a curve, it removes rock and soil from the river bank.
C.
As the water's speed increases, it scours deep grooves in the muddy river bottom.
D.
all of these
Answer:
A) As the waters speed decreases along the inside edge of a curve, sediment is laid down to form a point bar
Explanation:
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity.
Plot the oxidation number of the following compounds:. H2SO4, H4P2O7, HCl, HNO3, NO, H2O, NaCl, F2, Cl2, Fe2(SO4)3
Answer:
where ni = no. of moles of any compound and mi = molecular mass of any ... Sulphur : (w) O.C. + HNO3 → H2SO4 + BaCl2 → (w1) BaSO4 ... 0.365 g of pure HCl gas is dissolved in 50 mL of solution. ... yield is 80% then calculate the amount of Cl2 produced. the amount of water ... Fe2O3 + 3SO3 Fe2(SO4)3
Explanation:
did that help if not please contact me in the comments.
How can the law of conservation of
mass for a chemical reaction be expressed?
Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
How does the concept of conservation of mass apply to chemical reactions? the reactants and products have exactly the same atoms. the reactants and products have exactly the same molecules. the change in the amount of matter is equal to the change in energy.
can someone help me with my qustions?
Explain in a short sentence how you can tell if a reaction is a single replacement
reaction.
Explanation:
The reaction can be said to be a single replacement reaction if one substance in a chemical reaction is replacing another one.
For example:
A + BC → AC + B
In such reactions there is a replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution.
The relative positions of the two elements in the activity series provides the driving force for a single replacement reaction. If one element that is to replace another in a compound is more active, the reaction will occur. If it is less reactive, there will be no reaction.
Which kind of worm has a closed circulatory system?
a planarian
a fluke
a pinworm
an earthworm
An earthworm has a closed circulatory system.
The earthworm has a closed circulatory system. An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm.
As important as they are alive for distributing nutrients and organisms and decomposing matter, worms are also very important in the food chain. They provide a crucial protein-rich source of food for other important species like birds, hedgehogs and frogs.
They may live up to eight years, though one to two is more likely. Full size for an earthworm varies among species, ranging from less than half an inch long to nearly 10 feet.
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