Answer:
carbon -12 atoms times by weight
Answer:
Carbon-12 atom
Hope you could understand.
If you have any query, feel free to ask.
A sample of a compound is decomposed in the laboratory and produces 72.1 g carbon, 12.1 g hydrogen, and 48.0 g oxygen. Calculate the empirical formula of the compound.
Answer:
empirical formula is C6H12O3
Explanation:
A sample of a compound is decomposed in the laboratory and produces
72.1 g carbon, 12.1 g hydrogen, and 48.0 g oxygen. Calculate the empirical formula of the compound.
divide the gm by the atomic mass and ratio the results
C=72.1/12.01 =6.00
H = 12.1/1.01 = 11,98 =~12
O =48.0/16 = 3
empirical formula is C6H12O3
A gaseous mixture contains 0.545 bar H, (8), 0.517 bar N, (8), and 0.107 bar Ar(g). Calculate the mole fraction, X, of each of
these gases.
In this case, it can be see that we have a gas mixture wherein hydrogen has a partial pressure of 0.545 bar, nitrogen 0.517 bar and argon 0.107 bar and we are asked to calculate the mole fraction of each gas.
According to the given information, it turns out possible for us to use the Dalton's law in order to calculate the mole fraction of each gas in the mixture. However, we first must calculate the total pressure of the mixture by adding them all together:
[tex]P_T=0.545bar+0.517bar+0.107bar=1.169bar[/tex]
After so, we proceed to the mole fractions by dividing the pressure of each by the total one:
[tex]x_{H_2}=\frac{0.545bar}{1.169bar} =0.466\\\\x_{N_2}=\frac{0.517bar}{1.169bar} =0.442\\\\x_{Ar}=\frac{0.107bar}{1.169bar} =0.092[/tex]
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Compound X has a solubility of. 30g in 100g of water at 20c what is the minimum amount of water, in grams, that is needed to dissolve 90g of compound X
Which of the following best describes subduction?
a more dense plate going beneath a less dense plate
one plate colliding with another
one plate destroying another
one plate dividing another
Answer:
A more dense plate going underneath a less dense plate.
i have a question can someone answer these questions for me please?
given that R=0.0821 (L•atm) / (mol•K) how many moles must be in a 2L container at 1.8 atmospheres with a temperature of 270K
The number of mole in the container at 1.8 atm with a temperature of 270 K is 0.162 mole.
From the question given above, the following data were obtained:
Gas constant (R) = 0.0821 atm.L/Kmol
Volume (V) = 2 L
Pressure (P) = 1.8 atm
Temperature (T) = 270 K
Number of mole (n) =?Using the ideal gas equation, we can obtain the number of mole in the container as illustrated below:
PV = nRT1.8 × 2 = n × 0.0821 × 270
3.6 = n × 22.167
Divide both side by 22.167
n = 3.6 / 22.167
n = 0.162 moleTherefore, the number of mole in the container is 0.162 mole
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One way to limit deforestation is by
A. Practicing crop rotation
b. Increaseing soil fertilization
C. Increase of wood products
D. Using trees grown on tree farms
Thank you!
Answer:
the answer should be d I'm pretty sure.
how do the joints help to facilitate movement
Answer:
Joints are movable connections between two bones. ... It provides a smooth surface to stop the bones in the joint from rubbing against each other too much. The cartilage passes the pressure in the joint on to the bone underneath it. This is especially important in joints that bear heavier loads, such as hip or knee joints
Explanation:
What is accumulation??
Answer:
Accumulation is something that's building up. For example, "My trash accumulates every Saturday."
safety rules for using primus stove
Answer:
1. Never leave the gas cartridge in the stove when you’re not using it.
2. Always wait until the stove cools down before you remove the gas cartridge.
3. Always try to store gas cartridges and camping stoves in a dry place
4. Clean your stove each time you have used it because it needs to be clean in order to perform at its best.
Can someone help me with questions c,d , and number 16 for 10th grade chemistry
Answer:
i cant but ask awadtameem for help
Explanation:
Please help me with this thank you so much !!
Answer:
C and D
Explanation:
The answer is C and D
What causes bonds in oxygen and glucose molecules to break
Answer: Cellular Respiration
Explanation: Is the process in which the cells of living things break down the organic compound glucose with oxygen to produce carbon dioxide and water. The overall chemical equation for cellular respiration is:
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy (stored in ATP)
Cellular respiration takes place in the cells of all organisms. It occurs in autotrophs such as plants as well as heterotrophs such as animals.
Aqueous NaOH was chosen as the solvent to crystallize benzoic acid. Why is this solvent a bad choice for the recrystallization
NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
Recrystallization is a process of obtaining a pure solute by dissolving a solute in a solvent at high temperature and cooling the solution rapidly so that the pure solute can crystallize out of solution.
It is important to note that the solute must not react with the solution from which it is to be recrystallized. Unfortunately, NaOH reacts with benzoic acid to form sodium benzoate therefore, aqueous NaOH is a bad choice for the recrystallization of benzoic acid.
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Please help thank you!!!!
Answer:
0.4 mol
Explanation:
We will use the formula:
n = cv
n is the number of moles, c is the concentration/molarity, v is the volume in LITRES.
Step 1: convert the volume to Litres. 500 mL is 0.5 Litres
Step 2: apply the formula
n= (0.8)(0.5)
n = 0.4 mol
What is the maximum value of the secondary quantum number (l) allowed for atomic electrons with a principal quantum number n = 7?
Explanation:
Principal quantum number=n=7
Azimuthal quantum number=l:-
[tex]\\ \sf\longmapsto n-1[/tex]
[tex]\\ \sf\longmapsto 7-1[/tex]
[tex]\\ \sf\longmapsto \ell=6[/tex]
The maximum value of the secondary quantum number (l) allowed for atomic electrons with a principal quantum number n = 7 is 6.
What are quantum numbers?The term quantum number is used to describe the set of numbers that describe the position of an electron in an atom. Now we know that the secondary quantum number (l) have values from zero to n - 1.
Hence, the maximum value of the secondary quantum number (l) allowed for atomic electrons with a principal quantum number n = 7 is 6.
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20 N 50 N SS what is the net force
Answer:
If it is 20 N and 50 N then, the net force would be 70 N if they are on the same side
Explanation:
Are they on the same side?
At what temperature (in K) will 3.5 moles of gas occupy 2.7 L at 1.5 atm? HELP PLEASE!
3.5 moles of a gas will occupy 2.7 L at 1.5 atm at a temperature of 14.1K
IDEAL GAS LAW:
The temperature of a gas can be calculated using the ideal gas law equation:PV = nRT
Where;
P = pressure (atm)V = volume (L)n = number of moles (mol)R = gas law constant (0.0821 Latm/molK)T = temperature (K)According to this question, P = 1.5atm, V = 2.7L, n = 3.5moles, T = ?1.5 × 2.7 = 3.5 × 0.0821 × T4.05 = 0.28735TT = 4.05 ÷ 0.28735T = 14.1KTherefore, 3.5 moles of a gas will occupy 2.7 L at 1.5 atm at a temperature of 14.1KLearn more at: https://brainly.com/question/13821925?referrer=searchResults
saturated solutions changes into unsaturated by heating why
Consider the unbalanced chemical equation:
H3PO4 (aq) + Ba(OH)2 (aq) → Ba3(PO4)2 (S) + H2O
A volume of 46.0 mL of aqueous Ba(OH)2 solution was required to
react completely with 0.685 g H3PO4 (molar mass = 98.0 g/mol) to
produce Ba3(PO4)2. Calculate the molar concentration of the
Ba(OH)2 solution.
A)0.552 M
B)0.228 M
C)0.403 M
D)0.328 M
E) 0.655 M
By balancing the equation, it is obtained that 2 moles or 196 g of H₃PO₄ is required to react with 3 moles or 514.02 g of Ba(OH)₂. Thus, 0.685 g of H₃PO₄ reacts with 1.796 g Ba(OH)₂. The molarity of 1.796 g of Ba(OH)₂ in 46 ml is 0.217 molar.
What is molarity?Molarity of a solution is the ratio of the number of moles of solute to the volume of solution in liters. Molarity is the common term used to represent the concentration of the solution.
The balanced equation of the given reaction is written as:
[tex]\rm 2 H_{3}PO_{4} + 3Ba(OH)_{2} \rightarrow Ba_{3}(PO_{4})_{2} + 6H_{2}O[/tex]
As per this reaction, 2 moles of H₃PO₄ reacts with 3 moles of Ba(OH)₂.
Molar mass of H₃PO₄ = 98 g/mol
2 moles = 2 × 98 = 196 g.
molar mass of Ba(OH)₂ = 171.3 g/mol
3 moles = 171.3 × 3 = 514.0 g.
The mass of Ba(OH)₂ produced from 0.685 g of H₃PO₄ is calculated as follows:
= (0.685 × 514 g) /196 g
= 1.796 g.
Number of moles of 1.796 g of Ba(OH)₂ = 1.796 g/ 171.3 g/mol = 0.010 mol
The volume of the solution is 46 ml or 0.046 L. Thus, molarity of the solution is = no.of moles/volume in L
= 0.010 moles/ 0.046 L
= 0.217 M.
Therefore, the molar concentration of Ba(OH)₂ is 0.217 M.
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What precautions need to be taken for working with the nucleophilic medium? What does it consist of?
A precaution that needs to be taken for working with the nucleophilic medium is ensuring the stability of the carbonation intermediate formed and Steric hindrance.
Discussion:
The likelihood of a nucleophilic substitution reaction proceeding by a dissociative mechanism depends to a large degree on the stability of the carbocation intermediate that forms.
Steric hindrance: Reactions where nucleophiles attack carbon-based electrophiles are significantly more sensitive to steric effects, because empty orbitals on carbon are not as accessible.
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#4.
4. Use the atomic model above to answer the following questions: 1 pt for each blank
a. How many protons?
b. How many neutrons?
c. What is the name of this atom?
Answer:
A → 16 protons
B → 16 neutrons
C → Sulfur
Explanation:
Remember, in a neutral atom the amount of protons is the same as the number of electrons. In the picture provided, its shown that there are 16 electrons which means there are 16 protons. Finding the amount of neutrons will be more tricky. The valence electron count will allow us to find this. The valence electrons will allows us to determine where it is on the periodic table (So does atomic number). The valence electron count is 6. So, using the current information (6 valence electrons and atomic number of 16) we can look at the periodic table and pinpoint which element it is. As you look, you'll find that the element sulfur matches the information. Since the element is sulfur, and it has an atomic mass of 32, we can subtract the atomic number from the atomic mass to find the amount of neutrons.
32 - 16 = 16
Thus, the atom in the picture is sulfur with an atomic number of 16, atomic mass of 32, and an electron count of 6.
How much has our global temperature risen in the last 100 years? A. 5.0°F B. 10°F C. 0.5°F D. 1.0°F
Answer:
The answer is D.
Explanation:
calculate the mass percentage of H3PO4
Answer: phosphoric acid, H3PO4 (gives pop a tart taste)
% O: 1 mol H3PO4 (4 mol O / 1 mol H3PO4) (16 g / 1 mol O) = (64 g O / 98 g H3PO4) x 100 = 65.3%
% P: 1 mol H3PO4 (1 mol P / 1 mol H3PO4) (31 g / 1 mol P) = (31 g P / 98 g H3PO4) x 100 = 31.6%
Explain why warm nitric acid is used
Answer:
Lead is added to warm dilute nitric acid. When the carbonate has reacted with the warm acid, more carbonate is added until the carbonate is in excess.
Explanation:
Answer:
Nitric acid is used for the production of ammonium nitrate, a major component of fertilizers. It is also used for producing explosives like nitroglycerin and trinitrotoluene (TNT) and for oxidizing metals.
Explanation:
How did Avogadro know that a mole is exactly equals to 6.022×10²³ Particles?
Answer:
Avogadro's number is an absolute number: there are 6.022×1023 elementary entities in 1 mole. This can also be written as 6.022×1023 mol-1. The mass of one mole of a substance is equal to that substance's molecular weight.
How many mL of a 0.138 M aqueous solution of chromium(III) nitrate, , must be taken to obtain 14.0 grams of the salt
Answer:
Explanation:
First you need to calculate the mole of substance and then from the molarity the volume of the substance.
note: don't forget to convert volume liter mL in molarity.
the number of moles of a substance can be converted into molecules by:
Answer:
Multiply the molar amount by Avogadro's number.
Explanation:
NaOH + H₂SO4 -> Na2SO4 +H20 balance the equation
Answer:
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Explanation:
NaOH + H₂SO4 -> Na2SO4 +H2O
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Answer:
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Explanation:
2*H+2H=2*2H
2*Na=Na2
2*O+O4=O4+2*O
s=s
Mia wanted to know how Earth's movements created new landforms. She decided to read about folded mountains and their characteristics because
she had seen them in the Alps. Which of the following statements describe characteristics of folded mountains? Choose the three statements that apply
A They contain a combination of both anticlines and synclines
B. The crust deforms and bends but it does not break
C. The crust breaks into large chunks to form a series of sharp peaks
D. The folds can bend upward and form mountains
0 0 0
E The folds form in ridges over the top of divergent boundaries
F. They can cause Earth's crust to thin during mountain formation
Answer:
C. the crust breaks into large chunks to form a series of sharp peaks
Explanation:
plates are extremely thin and they can either collide and fuse or simply break. This causes mountains like the Alps and may cause volanic explosions as well.
https://www.nps.gov/subjects/geology/plate-tectonics-collisional-mountain-ranges.htm <- this article may be of interest to you.
The crust breaks into large chunks to form a series of sharp peaks. This describe characteristics of folded mountains. Therefore, the correct option is option C.
What is folded mountains?Mountains that have been folded are a result of compressive forces produced by endogenetic forces that originate inside the earth. These mountains, which may be found on all continents, are the tallest and largest in the globe.
Folded mountains are distributed throughout the world in a pattern that indicates that they are typically located along the edges of the continents, either in a north-south or an east-west direction. The crust breaks into large chunks to form a series of sharp peaks. This describe characteristics of folded mountains.
Therefore, the correct option is option C.
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