Answer:
D 4
Explanation:
32g/mol of oxygen is O2
64g/mol of oxygen is 2*32= 2O2
Balancing the reaction gives
4H2 + 2O2 => 4H2O
That is 4 moles of water
The number of water molecules produced is equal to 4 mol when the reaction starts with 64 grams of oxygen. THerefore, option (D) is correct.
What is a mole?A mole can be described as an international standard unit that is used to determine a given count of particles. The particles counted are generally chemically entities, individually distinct.
A mole can calculate a large number of quantities of molecules, atoms, ions, or other particular particles. The amount of chemical substance can be defined as a measure of elementary entities of a substance in a given sample.
The number of entities present in one mole can be described as equal to 6.023 × 10 ²³ is also known as Avogadro’s constant.
Given the chemical equation of water formation:
[tex]2H_2 + O_2 \longrightarrow 2H_2O[/tex]
Given, the mass of oxygen gas = 64 g
The number of moles of oxygen gas = 64/32 = 2 mol
From the chemical equation, we can say that one mole of oxygen gas forms two moles of water molecules.
2 moles of oxygen gas will water molecules = 2 ×2 = 4 mol
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As we increased the mass of the ball what happens to the acceleration?
As the mass of an object increases, its acceleration decreases. Acceleration is inversely proportional to mass.
Which of the following is not a source of light?
A. The moon
B. A glowworm
C. A star
D. Car headlight
Answer:
A. The moon
Explanation:
This is because the sun gives the moon the light the moon doesn't make it.
describe ph scale in detail
Answer:
pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
The molecular weight of table salt, NaCl, is 58. 5 g/mol. A tablespoon of salt weighs 6. 37 grams.
Calculate the number of moles of salt in one tablespoon.
First, complete the unit conversion using dimensional analysis:
Answer:
Answer in picture
Explanation:
A chemical change occurs when one or more substances change into entirely new substances with new and different properties. true or false?
Answer:
true
Explanation:
what is substance take change everything changes
Why is it proposed that the work of ATP is analogous to the work of money
why would adding water to the ester reaction mixture help us smell the ester
Answer:
A simple way of detecting the smell of the ester is to pour the mixture into some water in a small beaker. Esters are virtually insoluble in water and tend to form a thin layer on the surface. Excess acid and alcohol both dissolve and are tucked safely away under the ester laye
1. You have 100 ml of water. What is its mass?
Answer:
100 grams
Explanation:
12.09 kcal of energy is added to 45 grams of water at an initial temperature of
23.4°C. What is the final temperature of the water?
For 12.09 kcal of energy, added to 45 grams of water at an initial temperature of 23.4°C, the final temperature of the water is mathematically given as
T2=290C
What is the final temperature of the water?Generally, the equation for the Energy is mathematically given as
Q=mcdT
Therefore
Q=mcdT
12.09=45*(23.4-T2)
T2=290C
In conclusion, the final temperature is
T2=290C
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3. Use the equation for Charles’s Law to calculate the following. (2pts)
A balloon is filled up to 1 liter at a temperature of 294.15K. The balloon is then placed in a freezer for 24 hours at a temperature of 273.15K.
What is the volume of the balloon when it is taken out?
Answer:
It had changed by .001 liters because of the way that cold air can't evaporate more than .5 liters of air
Explanation:
What is the benefit of having a detailed procedure to follow
Answer:
see answer below
Explanation:
LOL idk what this question is about but to my understanding, having a detailed procedure gives u more clue on what u r doing and how u r doing it. think of this like a instruction manual, if u want to build a telescope and have no idea how to build it and the instrutions only give u short sentences like"screw nails next to the finger scope" or something like that wouldnt help much. i dont know about u but i rather prefer instructions written like this"first screw the nail beside the finger scope, DO NOT unscrew the botton" and continue. i cant build a telescope so yea dont know any directions to that.
A mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution. What is the molar concentration of the blue dye in the mixture
If a mixture is prepared by mixing 29.27 mL of the blue dye solution with 35.00 mL of the red dye solution and 14.73 mL of the yellow dye solution, the molar concentration of the blue dye in the mixture is
MB'=0.1189M
What is the molar concentration of the blue dye in the mixture?Generally, the equation for the moles is mathematically given as
Moles=Molarity *volume
Therefore
For Blue dye
MB=0.3523*25.27*1/1000ml
MB=8.90*10^{-3}
For red dye
MR=0.1017*35.27*1/1000ml
MR=3.55*10^{-3}
For yellow dye
MY=0.3523*14.73*1/1000ml
MY=2.27*10^{-3}
Where
Total volume is
T=25.27+35.ml+14.73
T=75ml
In conclusion, The molar conc of blue dye is
[tex]MB'=\frac{8.90*10^{-3}*1000}{75}[/tex]
MB'=0.1189M
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Compare and contrast the concepts of average mass and relative mass. Which one is more accurate, and why? Why is the one you did not choose inaccurate?
Answer:
Relative and average atomic mass both describe properties of an element related to its different isotopes.
Explanation:However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of [tex]C-12[/tex] isotope .
Out of relative and average atomic mass, relative atomic mass is more accurate as it is calculated with respect to a standard quantity.
Thus Relative atomic mass is more accurate than average atomic mass.
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Relative and average atomic mass both describe properties of an element related to its different isotopes.
Explanation: However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.
According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backwards because -
Answer:
for the force that sent the person forward, there is an equal force pushing back on the skateboard
How many methane molecules could form from these reactants? limiting reactants gizmo answers
Answer:
Explanation:not
9.3 mol H2O =
molecules H2O
Answer:
5.6 x 10²⁴ molecules H₂O
Explanation:
9.3 moles * (6.02214076 x 10²³) = 5.6 x 10²⁴
The Avogadro constant = 6.02214076 x 10²³
This constant is the number of particles (such as atoms, ions, or molecules) in one mole of something.
why are atoms attracted to each other in an ionic bond?
Answer:
The answer is C. Inversely, when this atom gains a positively charged ion. (The atom) becomes a negatively charged atom or an "anion".
Explanation:
Since electrons are negatively charged, an atom that loses one or more electrons will become positively charged, an atom that gains one or more electrons becomes negatively charged. The oppositely charged ions attract each other to form ionic networks (or lattices)
Answer:
opposite charges attract
Explanation: Ionic bonding is the attraction between positive and negative charge ions electrostatics explains why this happens: opposite charges attract and like charges repel. when many ions attract each other, they form large, ordered, crystal lattices in which each ion is surrounded by ions of the opposite charge. Happy to help my friend
A sample of calcium oxide (cao) has a mass of 2.80 g. the molar mass of cao is 56.08 g/mol. how many moles of cao does this sample contain? 0.0499 moles 20.0 moles 58.9 moles 157 moles
Answer:
0.0499 moles
Explanation:
56.08g => 1 mol
2.80g => y mol
Y = 2.80/56.08 = 0.0499 moles
A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
What is mole concept?Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.
No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.
Mass of a particular product is also find out by stoichiometry of a reaction as per the no. of mole given in the reaction.
No. of moles = Mass of compound ÷ Molar mass of compound
No. of moles = 2.80 ÷ 56.08 = 0.0499
Therefore, A sample of calcium oxide (CaO) has a mass of 2.80 g. the molar mass of CaO is 56.08 g/mol. No. of moles of CaO this sample contain are 0.499.
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Ammonia molecules are composed of carbon and sulfur and is used as a fertilizer.
True
False
Answer:
Ammonia (NH3) is composed of Nitrogen and 3 Hydrogens
Explanation:
ANSWER THIS QUICKLY FOR BRAINLIEST!!
Answer:
do good
Explanation:
do good
List in order which digits are significant in the following numbers:
a. 230 mL.
b. 0.00540 s
c. 1440
d. 50 ℃
e. 0.9405 g/cm3
f. 700 jellybeans
g. 1.05 x 106
Answer: see below
Explanation:
Zeros between the digit and decimal point are NOT significant.
Zeros between digits ARE significant.
a. 230 mL. sf: 23
b. 0.00540 s sf: 540
c. 1440 sf: 144
d. 50 ℃ sf: 5
e. 0.9405 g/cm3 sf: 9405
f. 700 jellybeans sf: 7
g. 1.05 x 10⁶ sf: 105
please help Why can we listen to radio or watch TV indoors?
A. It will work as long as the room has hardwood.
B. Walls absorb most of the incoming waves
C. It will work as long as the room is carpeted.
D. Walls don’t absorb the incoming waves
Answer:
D
Explanation:
A: not true. You could have cement floors and still receive radio/TV
B: not true. Very little of the waves are absorbed by the walls.
C: not true. You can receive radio/TV if there isn't a carpet in the entire house.
D: Dis the answer. Walls don't absorb the incoming waves or not much of them
describe what makes a diamond a mineral
Answer:
isn't diamond made from black coal? haha... just kidding. se the answer below
Explanation:
Diamond is a rare, naturally occurring mineral composed of carbon. Each carbon atom in a diamond is surrounded by four other carbon atoms and connected to them by strong covalent bonds - the strongest type of chemical bond.Diamond is the hardest known natural substance.
I hope I helped.
2. Which have a positive charge?
O atoms
O protons
O neutrons
O electrons
Answer:
protons
Explanation:
have a positive charge
Answer:
Protons!
Explanation:
Protons are positve! Protons start with P, and Positive starts with P. This is a very handy trick!
Does tilt of earths axis of rotation influence climate
Answer:
The greater Earth's axial tilt angle, the more extreme our seasons are, as each hemisphere receives more solar radiation during its summer
Explanation:
ASAP HELP, PLEASE HELP ASAP
Which statement accurately compares kinetic and Potential energy?
Question 5 options:
Gravity affect the amount of both kinetic and potential energy
Both kinetic and potential energy are a result of an unbalanced force acting on the object
Potential energy and kinetic energy both gain energy from standing still
Kinetic and Potential energy affect an object the same
Answer: gravity affect the amount of both kinetic and potential energy
Explanation:
Describe the structure of DNA.
Answer:
DNA is made up of two strands of nucleotides. The nucleotides are made up of a sugar (deoxyribose in DNA), a phosphate, and a nitrogen base. The sugars and phosphates make up the "handrails" (or "backbone"), and are held together by covalent bonds.
Explanation:
Calculate the number of representative particles. 5.00 mol Cl2
how do you do this
A regulation NBA basketball has a radius of 12 cm when inflated properly. What is the volume of an inflated basketball in cm^3?
someone help lol
Answer:
The volume of basketball is 7216.5 cm³.
Explanation:
Given data:
Radius of ball = 12 cm
Volume of ball = ?
Solution:
We will apply the volume formula of sphere.
V = 4/3 ×π×r³
we know that,
π = 22/7
r = 12 cm
Now we will put the values in formula.
V = 4/3 × 3.14 × (12 cm)³
V = 4/3 × 3.14 ×1728 cm³
V = 7216.5 cm³
Thus, the volume of basketball is 7216.5 cm³.
When the temperature goes up, the pressure will go up.
What is the reason?
Mention a real-world example?
Explanation:
As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.
For example, if an engineer has to store 600g of oxygen in a container and that oxygen needs to be kept at a pressure of 1 atm and a temperature of 125 degrees Fahrenheit, then this theorem (which is called Ideal Gas Law) is used to figure out what volume of a container needs to be built.