Answer:
5
Explanation:
First find the balanced equation for this rxn
C3H8 + 5O2 ====> 3 CO2 + 4 H2O
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The correct option is option A.
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.
Propane gas, C[tex]_3[/tex]H[tex]_8[/tex], burns in excess oxygen gas. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number terms, the coefficient for O[tex]_2[/tex] is 5.
C[tex]_3[/tex]H[tex]_8[/tex] + 5O[tex]_2[/tex] [tex]\rightarrow[/tex] 3 CO[tex]_2[/tex] + 4 H[tex]_2[/tex]O
Therefore, the correct option is option B.
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4. One mole of H2O has a mass of 18g. How many moles of H,0 are there in 54g of
H2O?
Answer: 3 moles
Explanation: Divide 54 by 18 to get 3.
Question 4 of 25
How do scientists write very large numbers?
O A. They round off all numbers to a few digits after the decimal.
O B. They express the numbers using scientific notation.
O C. They divide all numbers by a constant to reduce the size.
O D. They simplify the numbers by deleting the exponents.
Answer:
B.
Explanation:
please help
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
If the colored spheres are solutes, the overall direction of water would be out of the cell based on the principle of osmosis.
What is osmosisIt is the movement of water molecules from the region of high water potential (low solutes) to the region of low water potential (high solute) through a selectively permeable membrane.
In the illustration, there are more colored spheres outside of the cell than inside of it. This means that there are more solutes outside the cell (lower water potential) than inside of the cell (higher water potential).
Thus, water will move from the inside of the cell to the outside until an equilibrium is established.
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a gas that has a pressure of 7.5 atm and a volume of 20L what would be the new volume if the pressure was changed to 3.5 atm
Answer: 43 L
Explanation:
A gas is formed in the reaction shown below. The gas laws can help determine the volume of gas produced.
Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)
Assume that 130.8 grams of Zn was used in this reaction. To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used. What quantity in moles of Zn were used?
Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles of Zn usedThe balanced reaction is:
Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)
Assume that 130.8 grams of Zn was used in this reaction.
To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.
So to determine the number of moles used you know that the molar mass of Zn is 65.37[tex]\frac{g}{moles}[/tex]. Then:
[tex]molar mass=\frac{mass}{number of moles}[/tex]
[tex]65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}[/tex]
Solving:
number of moles× 65.37[tex]\frac{g}{moles}[/tex]= 130.8 g
[tex]number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}[/tex]
number of moles≅ 2 moles
Finally, the number of moles of Zn reactant used is 2 moles.
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A mutation can be defined as a change in an organism's
transcription.
phenotype.
genotype.
proteins.
Answer:
Genotype
Explanation:
A mutation is the change is DNA, aka the genotype
A dock worker uses a pulley system to raise a boat onto a dock. the pulley system has a mechanical efficiency of 73 %. the boat has a weight of 950 n. the pulley system lifts the boat 5 m into the air. how many newton-metres of work does the dock worker have to exert to lift the boat?
The work (newton-metres) the dock worker have to exert to lift the boat to 5 m in air is 6506.85 Nm
What is work done?This is simply defined as the product of force and distance moved in the direction of the force. Mathematically, it can be expressed as
Workdone (Wd) = force (F) × distance (d)
Wd = Fd
How to determine the output work done Force (F) = 950 NDistance (d) = 5 mOutput work =?Output work = Fd
Output work = 950 × 5
Output work = 4750 Nm
How to determine the input work done Output work = 4750 NmEfficiency = 73%Input work =?Efficiency = (output / input) × 100
73% = 4750 / input
0.73 = 4750 / input
Cross multiply
0.73 × input = 4750
Divide both side by 0.73
Input work = 4750 / 0.73
Input work = 6506.85 Nm
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Which compound has the longest carbon-carbon bond length?.
Hokkaido University researchers have synthesized an organic compound with a longer bond between carbon atoms than ever before - exceeding the assumed limit for carbon-carbon single bond (C-C) lengths. The researchers termed it a "hyper covalent bond." The novel polycyclic hydrocarbon named 10c is stable, and an X-ray analysis showed that its C-C bond lengths was as long as 1.806 angstroms, longer than the previously reported world records for hydrocarbons.
Determine whether Z is a “poison”. Explain your reasoning.
The substance Z will be a poison if it produces adverse effects on th body even in small quantities.
What is a poison?A poison is a substance which when ingested into the body of an organism causes harm or injury to that organism.
Poisons can be in gaseous, solid or liquid form.
Poisons may be natural or synthetic in nature.
The characteristics of poison include:
The produce adverse effects in the body they are toxic even in small amountsTherefore, the substance Z will be a poison if it produces adverse effects on th body even in small quantities.
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How can you get a real gas to behave like the LEAST like an ideal gas (minimize attraction between particles)?
A real gas behaves least like an ideal gas under the conditions of low temperature and high pressure.
This is because at low temperature and high pressure molecules of gas will have negligible kinetic energy and strong force of attraction. Thus, real gas will not behave like an ideal gas.
Whereas at high temperature and low pressure a real gas will behave like an ideal gas.
Answer: No real gas is ideal. All molecules have a volume and intermolecular forces of attraction. So a "real molar volume" is different from an ideal molar volume.
Explanation: I hope this help
Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
Answer:
Are molecules atoms that are chemically bonded together?
Image result for Molecules are chemically bonded atoms that work as a unit. Should the same kind of molecule be made up of the same kind of elements? Explain your answer
If this interaction is such that the total energy of the system is lowered, then the atoms bond together to form a molecule. Thus, from a structural point of view, a molecule consists of an aggregation of atoms held together by valence forces. Diatomic molecules contain two atoms that are chemically bonded.
Explanation:
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A small sample of methane burns, producing co2 and water vapor. as the hot gas mixture expands, it releases 120.0 kj of heat and does 830.0 kj of work pushing against a piston. what is the total amount of energy released in this reaction
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
What is energy?Energy is a property that is transferred to a physical system, recognizable in the performance of work and in the form of heat and light.
A small sample of methane undergoes combustion. As the hot gas mixture expands, it releases energy (E).
It releases 120.0 kJ of heat. By convention, when heat is released, we assign it a negative sign. Thus, q = -120.0 kJ.It does 830.0 kJ of work. By convention, when the system does work on the surroundings, we assign it a negative sign. Thus, w = -830.0 kJ.The change in the energy is the sum of the heat released and the work done.
ΔE = q + w = -120.0 kJ + (-830.0 kJ) = -950.0 kJ
A small sample of methane burns, releasing 120.0 kJ of heat and doing 830.0 kJ of work. The total energy released is -950.0 kJ.
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At constant temperature, a sample of helium at 760. Torr in a closed container was compressed from 5. 00 l to 3. 00 l. What was the new pressure exerted by the helium on its container?.
P₁V₁=P₂V₂
760.5=P₂.3
P₂=1266.6 torr
Answer the amount of miles of O2
Answer:
3
Explanation:
the answer is 3 because it is 3 for the o2 so 3 you have to pay more attention for the small ditails
Name and Describe two properties of water that’s important to life on earth
"The Univeral Solvent"
- Water is known to be the universal solvent because of its ability to dissolve more particles than any other liquid.
Cohesion- Cohesion is the property of water to attract other molecules. This helps in making solutions that are essential for most life to propagate.
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Bromthymol blue is an acid-base indicator that changes color around pH 7. Adding a small amount of bromthymol blue to a basic solution would be most helpful in _____.
A. determining the identity of the base in the solution
B. tracking the pH as the solution is gradually acidified
C. precisely measuring the pH of the solution
D. calculating the concentration of the base in the solution
Answer:
B) tracking the pH as the solution is gradually acidified
Explanation:
Got it right on the quiz!
hope this helped!
brainliest please!
Answer:
B. tracking the pH as the solution is gradually acidified
what is the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H2O
Considering the definition of pH, the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H₂O is 1.0969.
Definition of pHpH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:
pH= - log [H⁺]
The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.
Concentration of HClMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
In this case, you know:
number of moles=[tex]3.65 grams x\frac{1 mole}{36.45 grams} =[/tex] 0.1 moles (being 36.45 g/mole the molar mass of HCl)volume= 1250 mL= 1.250 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
[tex]Molarity=\frac{0.1 moles}{1.250 L}[/tex]
Solving:
Molarity= 0.08 [tex]\frac{moles}{liter}[/tex]= 0.08 M
pH of the solutionHydrochloric acid is a strong acid, so in aqueous solution it will be totally dissociated. So the concentration of protons is equal to the initial concentration of acid. This is: [H⁺]= [HCl]= 0.08 M
Replacing in the definition of pH:
pH= - log (0.08 M)
Solving:
pH= 1.0969
Finally, the pH of 3.65 grams of HCl dissolved in 1250 mL distilled H₂O is 1.0969.
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Can someone help me explain three features that make Lake Baikal one of the most unique lakes in the world.
Explanation:
1,it's crystal clear water and unique wild life.
2,It is home to many unique species animals and plants.
3, It's sediment have not been scoured by overriding continental ice sheet
What amount of alcohol consumed while boating is equivalent to the amount on land.
Answer:
yes it is
Explanation:
while boating or on the land it is the same amount of alcohol
Answer:
Any amount will be have the same effect on Blood Alcohol Content while boating OR on land .
Explanation:
Contrast (Compare) the Sun's gravitational pull on Earth when Earth is
closest to the Sun and when Earth is farthest from the sun.
Answer:
gravity equation.
Explanation:
use this gravity equation
F= G(m1*m2/d²)
Given that the molar mass of naoh is 40.00 g/mol, what mass of naoh is needed to make 2.500 l of a 2.000 m naoh solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.1250 g 5.000 g 32.00 g 200.0 g
The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given that, molarity of NaOH = 2M
Volume of NaOH solution = 2.5L
Moles of NaOH will be calculated by using the below equation as:
M = n/V
n = (2)(2.5) = 5 moles
Now we calculate the mass of NaOH of 5 moles as:
W = (5mol)(40g/mol) = 200g
Hence option (4) is correct.
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Answer:
d
Explanation:
A person sitting in a rolling chair at rest throws a basketball forward. Since the person and the rolling chair have a greater mass than the basketball, how will the person and the rolling chair respond?
They will have the same forward momentum as the basketball.
They will move backward at a lower speed than the basketball moves forward.
They will move backward at a higher speed than the basketball moves forward.
They will travel the same distance as the basketball travels but in the opposite direction
They will move backward at a lower speed than the basketball moves forward.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.
Initial momentum = Final momentum
The forward momentum of the basketball = Backward momentum of the person and the chair
Since the mass of the person and the chair is greater than the mass of the basketball, the person and the rolling chair will move backward at a lower speed than the basketball moves forward.
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This type of intermolecular force relates to the
big difference in the electronegativities. It exists
when N, O or F atom attracts with hydrogen
atom. Medium strength of attraction is
exhibited
The type of intermolecular force relates to the big difference in the electronegativities and is known as hydrogen bonding.
What are intermolecular forces?Intermolecular forces may be defined as the mechanism that mediates the interaction between the atoms of the molecules. It significantly includes the electromagnetic forces of attraction and repulsion between the atoms.
Some examples of intermolecular forces include London-dispersion force, dipole-dipole interaction, van der Waals interaction, hydrogen bonds, etc. Each one of them possesses a different set of characteristic properties distinctly. Some types of forces are also present in the body of living organisms.
Hydrogen bonding is a characteristic kind of interaction that remarkably includes dipole-dipole attraction between the most electronegative elements like Nitrogen, Oxygen, fluorine, etc., and the hydrogen atom.
Therefore, hydrogen bonding is a type of intermolecular force relates to the big difference in the electronegativities.
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An ion has a charge of +3 and has 51 electrons. How many protons does it have?
Answer:
54 protons
Explanation:
51 electrons 'balance' the charge of 51 protons....but there is three more PLUS charges ......means three more protons
51 + 3 = 54
How many moles of sulfur are in 53.7 grams of sulfur?
Answer:
1.67 moles (find this by dividing 53.7 by the gram formula mass of sulfur, which is about 32.1)
During the degradation of many amino acids, the first step involves transfer of the amino group to which citric acid cycle intermediate?.
Is Iron rusting a physical, or chemical change?
Answer:
the answer is chemical change because the act of rusting changes the substance of iron
Explanation:
2)
Molarity is defined as the
A)
moles of solute per liter of solution
B)
moles of solute per kilogram of solvent
volume of a solvent
C)
D)
mass of a solution
Answer:
A.moles of solute per liter of solution
Explanation:
the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams.
:-befrank
help I would really appreciate it tyy!!
Answer:
This image attached should help:
Explanation:
The reason that food web contains all organisms is because it shows every relationship, where food chain shows a more basic one. And the reason that they both have producers, consumers, and decomposers, is because they bothat least highlight a part of the almost every aspect, although it leans more to food web.
here's the answer to the question in the image, I couldn't comment on the right question because a bot already did.
1. ant, love
active
2. dog, man
dormant
3. bug, ring
burning
4. dress, up
pressure
5. think, tiger
trinker
How many grams are in 4.80 mol of sodium chloride ( NaCl )?
[tex]w = \text{Number of mols} \times \text{Molar mass}=4.8 \times 58.5=280.8~ g[/tex]
We know,
Molar Mass of Sodium= 23 and,
Molar Mass of Chlorine= 35.45
[tex] \therefore \text{Molar Mass of Sodium chloride= 58.44 }\text{g/mol}[/tex]
So, The Molar Mass in Grams=
[tex]58.44 \frac{\text{g}}{ \cancel\text {mol}} \times 4.80 \: \cancel\text{mol} \\ \\ \text{Mass of NaCl }= 280.51\: \text {gram}[/tex]
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