To solve this, we have to turn the moles into atoms:
2.5 moles/1 x 6.022x10^23 atoms/1 mole = 15.05 x 10^23 atoms
Answer: 15.05 x 10^23 atoms
I hope this helps!
Silicon is the eighth most abundant element in the Universe. There will be 15.05 * 10²³ atoms in the silicon.
What is number of moles?Silicon is the eighth most abundant element in the Universe; it is made in stars with a mass of eight or more Earth suns.
Near the end of their lives these stars enter the carbon burning phase, adding helium nuclei to carbon to produce oxygen, neon, magnesium and silicon.
1 mole contains 6.022x10²³ atoms.
2.5 mole contains = x atoms.
x= 2.5 moles/ 6.022x10²³ atoms.
= 15.05 x 10²³ atoms
Therefore, Silicon is the eighth most abundant element in the Universe. There will be 15.05 * 10²³ atoms in the silicon.
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If 77.0 mL of nitrogen gas is collected over water at 50 °C and 763 mm Hg, what is the volume of dry nitrogen gas at STP? The vapor pressure of water at 50 °C is 92.5mm Hg.
The volume of the dry nitrogen gas at STP is 57.4 mL
From the question given above, the following data were obtained:
Initial volume (V₁) = 77 mL
Initial temperature (T₁) = 50 °C = 50 + 273 = 323 K
Initial pressure (P₁) = 763 – 92.5 = 670.5 mmHg
Final temperature (T₂) = STP = 273 K
Final pressure (P₂) = 760 mmHg
Final volume (V₂) =?The volume of the dry nitrogen can be obtained by using the combine gas equation as follow:
[tex] \frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2} \\ \\ \frac{670.5 \times 77}{323} = \frac{760 \times V_2}{273} \\ \\ cross \: multiply \\ \\ 323 \times 760 \times V_2 = 670.5 \times 77 \times 273 \\ \\ divide \: both \: side \: by \: 323 \times 760 \\ \\ V_2 = \: \frac{670.5 \times 77 \times 273 }{323 \times 760} \\ \\ V_2 = 57.4 \: ml[/tex]
Therefore, the volume of the dry nitrogen gas is 57.4 mL
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Cyclobutane consists of 4 atoms of carbon and 8 atoms of hydrogen. What is cyclobutane's empirical formula
Answer:
What is cyclobutane empirical formula : C4H8
Explanation:
How are traits inherited?
Please explain thoroughly
inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment
What is a element
2. compound
3.molecules
Answer:
what is Element: each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms.
Explanation:
2. compound:a thing that is composed of two or more separate elements; a mixture.
3. Molecules: A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge
How many moles of methane are produced when 25. 1 moles of carbon dioxide gas react with excess hydrogen gas.
Answer:
25.1 moles
Hence it can be seen that when 25.1 moles of carbon dioxide gas react with excess hydrogen gas, 25.1 moles of methane gas are produced.
How much heat is absorbed when 25 g of water increases by 45 K?
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
Let suppose that temperature change experienced by water is entirely sensible. Then, we can estimated the heat absorbed by the water sample ([tex]Q[/tex]), in joules, through this expression:
[tex]Q = m\cdot c \cdot \Delta T[/tex] (1)
Where:
[tex]m[/tex] - Mass of the water sample, in grams.[tex]c[/tex] - Specific heat of water, in joules per kilogram-Kelvin.[tex]\Delta T[/tex] - Temperature change, in Kelvin.If we know that [tex]m = 25\,g[/tex], [tex]c = 4.186\,\frac{J}{g\cdot K}[/tex] and [tex]\Delta T = 45\,K[/tex], then the heat absorbed by the water sample is:
[tex]Q = (25\,g)\cdot \left(4.186\,\frac{J}{g\cdot K} \right)\cdot (45\,K)[/tex]
[tex]Q = 4709.25\,J[/tex]
4709.25 joules of heat are absorbed when 25 grams of water increases temperature by 45 K.
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what word describes when tiny droplets of one liquid are finely dispersed within another liquid?
When tiny droplets of one liquid are finely dispersed within another liquid it is called emulsion.
Emulsion can be defined as the process by which two liquids that are not miscible come together to form a mixture.
The emulsion mixture usually consists of an oil phase and a water phase.
The oil phase appears as droplets when dispersed (mixed with) the water phase.
The uses of emulsion include:
It is used in chemical industries for production.It is used for production of medicine.Digestion of fatty food components in the intestine takes place through the process of emulsion.Learn more here:
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If 5.3 g of gallium reactions with 5.3 g of oxygen according to the following reaction, how many grams of gallium oxide can be produced?
Word equation:
Formula equation:
(Must be balanced!)
Answer:
can you help mine please
How many molecules of chlorine are needed to react with 56.Og of iron to form Iron (III) chloride (FeCl3)?
what is the mass of the product of 111.6g and 48g
Answer:
159.6
Explanation:
Due to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. Hence, the mass of the product is the equivalent of the mass of the sum of the reactants.
some macromolecules are polymers. what is a polymer
Answer:
1 marcomolecules are:- A macromolecule is a very large molecule, such as a protein. They are composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers.
2 polymers are:- a natural or artificial chemical compound consisting of large molecules
Explanation:
hope it helps you
A sound wave is an example of a __________ wave. It requires a _________ to transfer energy
Question 2 options:
medium, longitudinal
longitudinal , medium
medium, transverse
transverse, medium
Answer:
example of a medium, it requires a transverse
where electrons are likely to be found as they travel around the nucleus
Answer:
The electrons are most likely to be found in An orbital
Please help me, I'm stuck and I don't know how to do it.
How many atoms are there in 7.02 g Si ?
Answer:
1.51e23 atoms
Explanation:
First, using the molar mass of Si (28.1 g/mol), determine the # of moles of Si we have. Then use Avogadro's number (6.022e23 atoms = 1 mol) to convert the # of moles to the # of Si atoms.
(7.02 g Si)([tex]\frac{1 mol}{28.1 g}[/tex]) = 0.250 mol Si
(0.250 mol Si)([tex]\frac{6.022*10^{23} atoms }{1 mol}[/tex]) = 1.51e23 atoms
The atomic mass of Silicon (Si) is 28.09 g/mol. The no. of atoms present in 7.02 g of Si is 1.46 × 10²³.
What is a mole?Any substance containing 6.022 × 10²³ atoms is called one mole of that substance. The no.of moles can be calculated by dividing the given weight by the atomic mass of the substance.
Atomic mass of Si = 28.09 g/mol
Given mass = 7.02 g.
No.of moles = 7.02 g/ 28.09 g/mol
= 0.24 moles
One mole contains 6.02 × 10²³ atoms. Thus 0.24 mole of Si contains 6.02 × 10²³ × 0.24 = 1.46 × 10²³ atoms.
Hence, no.of atoms present in 7.02 g of Si is 1.46 × 10²³ .
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A fusion reaction always creates which of the following?
a A massive amount of energy.
b A massive amount of heat.
C A more massive atomic nucleus.
d A massive number of smaller nuclei.
A fusion reaction can be regarded as the type of reaction that occurs where two lighter elements come together in a type of reaction giving rise to a heavier/more massive element.
A fusion reaction always creates a more massive atomic nucleus (option c).
When the two lighter nuclei comes together in a reaction, a more heavier/massive nucleus is formed but its mass will still be less than the combined mass of the two reactant nuclei.
This also indicates that the left over mass may have been released as energy.
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Which statement BEST describes how many Aluminum atoms are needed when making Aluminum chloride?
Question 11 options:
1 Aluminum atom is needed because Aluminum donates one valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum donates three valence electron to Chlorine.
3 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
2 Aluminum atom is needed because Aluminum accepts three valence electron from Chlorine.
Answer:
34 Aluminum Atoms needed to make Aluminum Chloride
Explanation:
Because through this bottom 34 atoms are subheading to make Aluminum Chloride through magnesium5. When argon was discovered, it was placed between chlorine and potassium, even though the periodic
table at that time was organized by increasing atomic weight. Why did scientists choose to place argon
before potassium?
Which of the following is NOT a chemical reaction?
Select one:
a.
Hydrogen and oxygen combine to make water
b.
Ammonia breaks up into nitrogen and hydrogen
c.
Ice melts to form water
Which was the first ""cell"" viewed by the light microscope?microbeatomdnaoak bark.
Answer:
The cork cell
Explanation:
¿Quién estableció el concepto moderno de elemento?
Answer:
Robert Boyle
Explanation:
En muchos textos se suele considerar a Robert Boyle como el científico que introdujo en la Química un concepto de elemento diferente al empleado por los aristotélicos o por los alquimistas y que sirvió de antecedente al que formulara Lavoisier en 1789.
400.0 mL of a 0.425 M solution of NaCl is diluted to 900.0 mL. What is the new concentration of the solution
The new concentration of the solution that has 400.0 mL of a 0.425 M solution of NaCl diluted to 900.0 mL is 0.189M
HOW TO CALCULATE CONCENTRATION:
The concentration of a diluted solution can be calculated using the following formula:C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volumeAccording to this question, a solution of NaCl has 400.0 mL of a 0.425 M solution and diluted to 900.0 mL. The new concentration is as follows:400 × 0.425 = 900 × C2
170 = 900C2
C2 = 170 ÷ 900
C2 = 0.189M
Therefore, the new concentration of the solution that has 400.0 mL of a 0.425 M solution of NaCl diluted to 900.0 mL is 0.189M.Learn more at: https://brainly.com/question/8795644?referrer=searchResults
una pieza de hierro de 25cm3 tiene una masa de 195g cual es su densidad?
Answer:
Pretend you are a TV producer. Think of ideas for new TV shows. Your objective is to create ideas that will be successful, regardless of whether this is quality programming or not. Think of an idea of a copy. Explain the basics of what this show will be like and what show it is copying. Explain why you feel this show will be popular. Think of an idea of a spin-off. Explain the basics of what this show will be like and what show it is spinning off from. Explain why you feel this show will be popular. Think of an idea for a TV show that falls into one of the genre categories listed in the genre chart. Describe the basics of the show and how it falls under the genre’s expectations for characters, plots, and aesthetics. Explain why you feel this show will be popular.
If a particular utility burned 6.17 million tons of coal that was 2.00% sulfur by weight, how many tons of sulfur dioxide was emitted?
246800 tons of sulfur dioxide was emitted by the utility company who burned 6.17 million tons of coal.
6.17 million tons of coal contain 2.00% sulfur, hence the weight of sulfur is:
Weight of sulfur = 2% of 6.17 million tons = 0.02 * 6170000 = 123400 tons
123400 tons of sulfur is found in 6.17 million tons of coal
The weight of sulfur dioxide is twice that of sulfur, hence:
Amount of sulfur dioxide emitted = 2 * 123400 tons = 246800 tons
246800 tons of sulfur dioxide was emitted.
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Explain how the complexity and diversity of living things has changed over time
Answer:
Dylan invested $ 600 in a savings account at a 1.6 % annual interest rate . He made no deposits or withdrawals on the account for 2 years. The interest was compounded annually . Find, to the nearest cent, the balance in the account after 2 years. a₁ What information from the question is important ? b . How much does Dylan have in his bank account after 2 years ? Show work .
The branch of chemistry that deals with the interconversion of electrical and chemical energy is called .
Answer:
Electrochemistry
Explanation:
Which of these figures correctly illustrates the nature of the bonding of h2o?.
H2O is composed of two hydrogen atoms and one oxygen atom. The central oxygen atom is sp3 hybridized.
H2O is composed of two hydrogen atoms and one oxygen atom. The oxygen atom is bonded to the two hydrogen atoms at a dihedral angle of 104°. There are two lone pairs on the oxygen atom. The molecule has a bent geometry.
The structure of H2O is shown in the image attached to this answer. The central oxygen atom is sp3 hybridized and the shape of the molecule is based on a tetrahedron owing to its electron pair geometry.
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how to clean garbage disposal with baking soda and vinegar
the molecule represented within the box labeled z is
Answer:an amino acid
Explanation:
For me this was the correct answer on a castle learning
Help please, take a screenshot who will answer will be brainiest.
Answer:
1. Metals are typically shiny, and good at conducting electricity and heat and have a high melting point. Non-metals are typically dull, and poor at conducting electricity and heat and have a low melting point.
2. Element C and element E.
3. a. It is a poor conductor of electricity
b. It is a good conductor of heat
Explanation:
As it says in the chart at the top of the picture, metals are typically good at conducting electricity and heat and have a high melting point. Non-metals are typically poor at conducting electricity and heat and have a low melting point.
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Which pair of atoms will form a covalent bond?
Question 7 options:
H and O
Li and I
K and Fl
Na and Cl
Answer:
h and o
Explanation:
because both are non metals
Someone help me with this pls
