Answer:
19 atoms
Explanation:
6 carbon, 12 hydrogen, one Nitrogen
i don’t get this- it’s due tmrw
Which would occur if a ball x were rolled across a smooth floor to collide with a similar ball y that was stationary
Answer:
For a collision where objects will be moving in 2 dimensions (e.g. x and y), the momentum will be conserved in each direction independently (as long as there's no external impulse in that direction). In other words, the total momentum in the x direction will be the same before and after the collision.
Explanation:
A nonvolatile organic compound Z was used to make up a solution. Solution A contains 6.00 g of Zdissolved in 100 g of waterand has a vapor pressure of 754.5 mmHgat the normal boiling point of water. Calculate the molar mass of Z in solution A.
Answer:
Molar mass of Z in solution A is 148.2 g/mol.
Explanation:
To solve this, we need to use colligative property about vapor pressure.
In any ideal solution, the vapor pressure of solution is lower than vapor pressure of pure solvent. Formula is:
ΔP = P° . Xm
ΔP = Vapor pressure of pure solvent - Vapor pressure of solution
At the normal boiling point of water (100°C), vapor pressure is 760 mmHg.
Let's replace in the formula, to find out Xm (mole fraction of solute)
760 mmHg - 754.5 mmHg = 760 mmHg . Xm
(760 mmHg - 754.5 mmHg) / 760 mmHg = Xm
Xm → 0.00724
Mole fraction of solute = moles of solute /total moles (st + sv)
In this case, our mole fraction will be
(6 g / MM) / ( (6 g/ MM + 100 g / 18g/mol) = 0.00724
Our unknown is MM (molar mass of Z). We solve the equation:
6 g / MM = 0.00724 . ((6 g/ MM + 100 g / 18g/mol))
6 g / MM = 0.04344 g /MM + 0.0402 g/mol
6 g/MM - 0.04344 g /MM = 0.0402 g/mol
5.95656 /MM = 0.0402 g/mol
5.95656 / 0.0402 g/mol = MM → 148.2 g/mol
The molar mass of Z in solution A is 150 g/mol.
Based on the given information,
• The mass of water given is 100 grams.
• The mass of solute given is 6 grams.
• It is known that the molar mass of water is 18 gram per mole.
Now the moles of water can be calculated as,
[tex]n = \frac{mass}{molar mass}[/tex]
Now putting the values we get,
[tex]n = \frac{100 g}{18 g/mol} \\n = 5.5556 moles[/tex]
• It is known that the vapor pressure of water at 100 degree C (Po) is 760 mmHg.
• The given vapor pressure of solution at 100 degree C is 754.5 mmHg.
• Based on Raoult's law, the vapor pressure of solution = mole fraction of water * Po of water.
The mole fraction of water is,
[tex]= \frac{754.5 mmHg}{760 mmHg} \\= 0.9928[/tex]
The mole fraction of solute is,
[tex]= 1-0.9928\\= 0.00722[/tex]
The mole fraction of solute = n1/n1+n2
Now putting the values we get,
[tex]\frac{n1}{n1+n2} = 0.00722\\\frac{n1+n2}{n1} = \frac{1}{0.00722} \\[/tex]
[tex]\frac{n1+5.56 mol}{n1} = 138.50\\n1 = \frac{5.56 mol}{138.50} \\n1 = 0.040 mol[/tex]
Now the molar mass of solute, Z is,
[tex]Molar mass = \frac{mass}{moles} \\Molar mass = \frac{6.0 grams}{0.04 mol} \\Molar mass = 150 g/mol[/tex]
Thus, the molar mass of Z in solution A is 150 g/mol.
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What causes radiation?
Answer:
It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or energized particles. There are different forms of radiation and they have different properties and effects
If I bought a pen, would this be an irreversible change? Explain why
Answer:
No
Explanation:
it will not be a irreversible change because u can give back the pen if it is in its original state and the shop keeper might accept it back that is what mostly happens. if the pen breaks or is used then it might me called a irreversible change until then it is reversible if not used yet.
thank u
Answer:
No
this is reversible because you can return the pen.
What causes the convection cell to turn left at point B?
P.S: This is for my science notes so try and make it a little simple thx
Answer:
Point B is in Between two convection, and is just below a ridge . This cause the cell to turn left because the flow of fluid hits the bottom of the crust this is the best I can do to Help you understand.
Day 1 code word for science?
Answer:
hail Hydra kandksmak Yes
Can anyone help out??
não se esqueça de mim não sei
3
2
1
4
6
5
not a 100% sure but i think this is it.
Two liquids X and Y boil at 110°C and 140°C respectively. Which of them has higher
vapour pressure at 50°C? Why?
Answer:
X
Explanation:
Liquid X has higher vapor pressure because the greater the temp the weaker and the lower the temp the stronger/faster... :)
The carbon cycle is the exchange of carbon between the lands, the oceans the atmosphere and the earth's interior
O True
O False
Answer:
True
Explanation:
Carbon is the backbone of life on Earth. Most of Earth's carbon, about 65,500 billion metric tons is stored in rocks. The rest is in the ocean, atmosphere, plants, soil, and fossil fuels. Carbon flows between each reservoir in an exchange called the carbon cycle, which has slow and fast components.
Jewelry and tableware are sometimes made of sterling silver. Sterling silver is 92.5% silver (Ag) and 7.5% copper (Cu). If you wanted to make 30 grams of sterling silver for a ring, how many grams of silver and copper would you need to start with?
Amount of sterling silver?
Amount of copper?
total grams of alloys needed?
Answer:
12.33
Explanation:
92.5/7.5= 12.33
30g of the sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.
What is cross multiplication?Cross multiply fractions by multiplying one fraction's denominator by the other fraction's numerator and then comparing the two values. The larger fraction is the one with the higher value.
100g of sterling silver contains 92.5g of silver and 7.5g of copper.percentage of element = amount of the element present in 100 g of materialTherefore,
100g sterling silver = 92.5g silver30g sterling silver = X g silver( cross multiplication),
100 × X = 92.5 × 30
X = 92.5 × 30/ 100
X= 27.75g silver100g sterling silver = 7.5g copper
30g sterling silver= Y g copper
(cross multiply)
100 × Y = 7.5 × 30
Y= 7.5 × 30 / 100
Y= 2.25g copperX (silver)= 27.75 g in 30 g of sterling silverY (copper)= 2.25 g in 30 g of sterling silvertherefore, 30g of sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.
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Which statement describes steps involved in the production of hydroelectric power?
A. Falling water turns a turbine that helps generate electricity.
B. Moving water turns a paddle wheel that helps generate electricity.
C. Water falls down a pipe to generate electricity.
D. Potential energy of water is directly transformed into electrical energy.
5.478 grams of potassium acetate and 2.143 grams of iron(III) hydroxide are added to a beaker containing 100.0 mL of water and stirred vigorously. A solid settles to the bottom of the beaker. If the water is decanted and the solid is dried, what is the maximum mass of solid that should be recovered
Solution :
[tex]$Fe(OH)_3+3CH_3COOK \rightarrow Fe(CH_3COO)_3 + 3KOH$[/tex]
(iron (potassium
hydroxide) acetate)
Number of moles of [tex]$Fe(OH)_3 = \frac{\text{mass of }Fe(OH)_3}{\text{molar mass of }Fe(OH)_3}$[/tex]
[tex]$=\frac{2.143 \ g}{106.867 \ g/mol}$[/tex]
= 0.02005 mol
Number of moles of [tex]$CH_3COOK = \frac{\text{mass of }CH_3COOK}{\text{molar mass of }CH_3COOK}$[/tex]
[tex]$=\frac{5.478 \ g}{98.15 \ g/mol}$[/tex]
= 0.0585 mol
Since 1 mol of [tex]$Fe(OH)_3$[/tex] reacts with 3 mols of [tex]$CH_3COOK$[/tex]
Therefore, number of moles of [tex]$CH_3COOK$[/tex] reacted [tex]$=\frac{0.0585}{3 }$[/tex] mol
= 0.0195 mol
Therefore the limiting reagent is [tex]$CH_3COOK$[/tex] and hence the number of moles of [tex]$Fe(CH_3COO)_3$[/tex] produced is 0.0195 mol
Amount of [tex]$Fe(CH_3COO)_3$[/tex] produced = moles x molar mass
= 0.0195 moles x 232.98 g/mol
= 4.5431 g
Carbon dioxide is produced by the human body through
O combustion
O respiration
O photosynthesis
O decomposition
Answer:
Respiration
I hope this helps!
Rings are a characteristic of
Answer:
physical
Explanation:
if it is asking to determine what it is a sign of or how to identify that characteristic it would be a physical.
How many atoms is 45 moles of silicon (Si)?
What is the mass of 48 ml of a liquid if its density is 1.25 g/ml?
Answer:
60 g
Explanation:
Mass = Density × Volume
Mass = 1.25 × 48
Mass = 60 g
I hope this helps!
What is the theoretical yield of SO3 produced by 4.91 g of S?
Answer:
12.2 g
Explanation:
Step 1: Write the balanced equation for the synthesis of SO₃ from S
S + 1.5 O₂ ⇒ SO₃
Step 2: Calculate the moles corresponding to 4.91 g of S
The molar mass of S is 32.07 g/mol.
4.91 g × 1 mol/32.07 g = 0.153 mol
Step 3: Calculate the theoretical yield, in moles, of SO₃ from 0.153 moles of S
The molar ratio of S to SO₃ is 1:1. The moles of SO₃ produced are 1/1 × 0.153 mol = 0.153 mol.
Step 4: Calculate the mass corresponding to 0.153 moles of SO₃
The molar mass of SO₃ is 80.06 g/mol.
0.153 mol × 80.06 g/mol = 12.2 g
What mass will 7.29 moles of CO2 gas contain?
Answer:
[tex]320.8329\ \text{g}[/tex]
Explanation:
[tex]n[/tex] = Moles of [tex]CO_2[/tex] = [tex]7.29\ \text{moles}[/tex]
[tex]M[/tex] = Molar mass of [tex]CO_2[/tex] = [tex]44.01\ \text{g/mol}[/tex]
Mass is given by
[tex]m=nM[/tex]
[tex]\Rightarrow m=7.29\times 44.01[/tex]
[tex]\Rightarrow m=320.8329\ \text{g}[/tex]
The mass of the [tex]CO_2[/tex] gas will be [tex]320.8329\ \text{g}[/tex].
Explain the concept of law of multiple proportions
An unknown element X has the following isotopes: 126X (22.00%
abundant), 128X (34.00% abundant), 130X (44.00% abundant). What is
the average atomic mass in amu of X?
Answer:
[tex]m_X=128.44 a.m.u[/tex]
Explanation:
Hello there!
In this case, since the average atomic mass of an element, when given the atomic mass and the percent abundance of the naturally occurring isotopes is computed as shown below for this unknown element:
[tex]m_X=126*0.22+128*0.34+130*0.44[/tex]
Whereas the atomic mass of each isotope is multiplied by the percent abundancy; we obtain:
[tex]m_X=128.44 a.m.u[/tex]
Best regards!
Considering the definition of atomic mass, isotopes and atomic mass of an element, the atomic mass of the element is 128.44 amu.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
the first isotope has an atomic mass of 126 amu and a percent natural abundance of 22%. the second isotope has an atomic mass of 128 amu and a percent natural abundance of 34%. the third isotope has an atomic mass of 130 amu and a percent natural abundance of 44%.Then, the average mass of lithium can be calculated as:
126 amu×0.22 + 128 amu×0.34 + 130 amu×0.44= 128.44 amu
Finally, the atomic mass of the element is 128.44 amu.
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40 points for this question PLEASE HELP SOMEONE ILL GIVE BRAINLIEST
Answer:
whats the question?
Explanation:
What would be an inference you could make about this cat?
Answer:
pickles are ligit good
Explanation:
i like pickles but not his
True or False:
Houston, Texas received approximately 2 inches of snow on February 15, 2021. Based on this, we can now say Houston's climate consists of long, freezing winters and yearly snowfall. Please answer ASAP. Thanks
Answer:
False.
Explanation:
I majored in Chemistry
Which example is NOT a physical change? *
A. Green bananas turning yellow as they ripen.
B. Mixing ingredients to make a cookie.
C. Using dye to change the color of shirt
D. Getting your hairs cut.
Answer:
A
Explanation:
it is no longer going to unripen/ went through a chemical reaction
How many neutrons does beryllium have?
Answer:
7
Explanation:
Write the formula of the conjugate base of the Brønsted-Lowry acid, HIO3
Answer:
Explanation:
A conjugate base of HIO3 is IO3– ion
The chemical formula of the conjugate base of the Bronsted Lowry acid HIO₃ can be represented as IO₃⁻.
What is Bronsted - Lowry acid and bases?According to Bronsted - Lowry theory, acid is a substance that donates a proton or H⁺ ion and forms its conjugate base while the base is a substance that accepts a proton or H⁺ ion and forms its conjugate acid.
Bronsted-Lowry acid donates a proton to the other compound and forms a conjugate base.
Acid ⇄ Conjugate base + Proton
If a conjugate base accepts a proton back then acid reforms.
The Bronsted-Lowry base is a substance that accepts a proton from other compounds.
Base + Proton ⇄ Conjugate acid
If a conjugated acid donates its proton then the base reforms.
The conjugate base of the Bronsted-Lowry acid HIO₃ is:
HIO₃ ⇄ H⁺ + IO₃⁻
Therefore, the conjugate base of the Bronsted-Lowry acid HIO₃ is IO₃⁻.
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6.25 x 10^22 Molecules of BR2 = ?moles
0.104 mol Br₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
6.25 × 10²² molecules Br₂
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 6.25 \cdot 10^{22} \ molecules \ Br_2(\frac{1 \ mol \ Br_2}{6.022 \cdot 10^{23} \ molecules \ Br_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.103786 \ mol \ Br_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.103786 mol Br₂ ≈ 0.104 mol Br₂
Where is the main asteroid belt in the solar system?
Answer:
It's between Jupiter and Mars.A compound decomposes by a first-order process. If 36 %% of the compound decomposes in 60 minutes, the half-life of the compound is ________minutes. A compound decomposes by a first-order process. If 36 of the compound decomposes in 60 minutes, the half-life of the compound is ________minutes. -5 93 41 -18 39
Answer: The half-life of the compound is 93 minutes
Explanation:
Expression for rate law for first order kinetics is given by:
[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant =100
a - x = amount left after decay process = (100-36) = 64
a) for completion of 36 % of reaction
[tex]60=\frac{2.303}{k}\log\frac{100}{100-36}[/tex]
[tex]k=\frac{2.303}{60}\log\frac{100}{64}[/tex]
[tex]k=0.0074min^{-1}[/tex]
b) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]
[tex]t_{\frac{1}{2}}=\frac{0.693}{0.0074min^{-1}}=93min[/tex]
The half-life of the compound is 93 minutes