According to the mole concept, there are 1.4087 moles in 32.4 grams of sodium.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Number of moles in this case is obtained by dividing mass by molar mass that is, 32.4/23=1.4087 moles.
Thus, there are 1.4087 moles in 32.4 g of sodium.
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How to we measure energy?
Answer:
The official measurement unit for energy is the Joule (J). Among the most common units measuring energy mention should be made of the kilowatt/hour (kWh), used especially for electric energy (in fact it is used to calculate electricity bills).
why should scientists perform expierements
Answer:
Experiments are most useful when investigating predictions derived from explicit theories, and it is theories, rather than experimental results, that are properly used to explain features of natural settings.
Answer:
to explore new possibilities
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How many atoms of each element are in the chemical formula Ca(OH)2?
Please help❤️
Explain what is meant by noble gas envy.
Answer:
a phrase that describes how elements what do be stable and non reactive like the noble gas elements are.
In a group of rats, some individuals have a normal-sized body and others have a dwarf body. In this group, the gene for the body size trait has two alleles. The allele B is for a normal-sized body, and the alleles is for a dwarf body
Answer:
n a group of rats, some individuals have a normal-sized body and others have a dwarf body. In this group, the gene for the body size trait has two alleles. The allele for a normal-sized body (B) is dominant over the allele for a dwarf body (b).
Squeaky, a rat from this group, has a dwarf body.
Based on Squeaky's phenotype for the body size trait, which of the following could be Squeaky's genotype for the body size gene?
Explanation: can someone pls help?
In the following reaction, which element or compound is the oxidizing agent?
I NEED HELP ASAP
Answer:
[tex]O_{2}[/tex] is the oxidizing agent
Explanation:
An oxidizing agent is an element in a reaction that accepts the electrons of another element. It is typically hydrogen, oxide, or any halogen. In this case, it is oxygen. The answer is 02.
Answer:
i think it's 02 i might be wrongExplanation:
Which of these is an example of a biotic factor?
hot desert sun
Mojave River
acrid desert air
Mojave grasshoppers
Answer: Mojave grasshopper
Explanation: this is the answer because it is living
I will give you Brainly if you awsers right pl if your gonna awser for pints just put I don’t know
I believe the crrect answer is B) two
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An atom has 24 protons, 22 electrons, and 28 neutrons. What is the ATOMIC # of the atom?
6)
Use VSEPR to predict the electron-pair geometry of O2.
A)
linear
B)
trigonal planar
C)
tetrahedral
ientific
Calc
D)
trigonal bipyramidal
Answer:
A.) Linear
Explanation:
The geometry of the molecular oxygen (O₂) is linear. Thus, option (A) is correct.
What is VSEPR theory?Valence shell electron-pair repulsion theory (VSEPR theory) is used to predict the molecular structure, and bond angles around a central atom of a molecule by using the number of bonds and lone electron pairs in Lewis structure.
The VSEPR model considers that electron pairs present in the valence shell of a central atom have an arrangement so that repulsions between these electron pairs will be minimized by maximizing the distance between them.
The valence electrons of a central atom form either bonding pairs or lone pairs. The electrostatic repulsion of these electrons is minimized when several regions of high electron density maximum possible distance.
The oxygen molecule has linear geometry with a bond angle of 180°. Each oxygen in oxygen molecule has two lone pairs of electrons on it.
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The central core of an atom is called the __?
Answer: Atomic Nucleus!
Explanation: All atoms have a dense central core called the atomic nucleus. Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge.
(Yes, it was from google.)
is combustion an example of the law of conservation of matter and why?
Answer:
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases, equals the original mass of the charcoal and the oxygen when it first reacted.
Please help with this I do not under stand
Answer:
See below:
Explanation:
The grasshopper doesn't require an exchange of gasses (air) using a circulatory system because the gasses directly reach its cell's from the "air sacs" which spread out into tiny tubes close to each cell.
3)
This polar bear lives where it is very cold. Its skin is black and that helps absorb heat. The polar bear also has thick
layers of fat called blubber. What is this blubber used for?
A)
It helps the polar bear swim in the ocean.
B)
It insulates and keeps the polar bear warm.
Females use the fat to feed the baby polar bears.
D)
Only males have fat and it is used to attract a mate.
Answer:
B
Explanation:
The blubber is so thick acts as installation
Answer:
I think the answer is B.
the force that holds paticles together in the atomic nuecleaus?
Explanation:
i believe you meant particles*
Which of the following is an intensive property?
Mass
Magnetism
Shape
Volume
Answer:
I believe its A. Mass
Explanation:
An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.
Answer:
B. Magnetism
Explanation:
Hope this helps! :))
Sorry for late answer
Are the atoms really "sharing" electrons
What is the volume of 80.0 g of ether if the density is 0.70 g/ml
Waves often bounce off objects such as water. What is this form of wave movement called?
A.
reflection
B.
refraction
C.
interference
D.
resonance
Answer:
Reflection
Explanation:
Reflection is when something is bounced off something else such as light bouncing off objects therefore the waves are reflecting. Also when light bounces off of a surface it reflects rather than refraction which refers to the light bending as it enters a new medium
PLEASE HELP ASAP I NEED THIS THANK YOU SOO MUCH
which of the two chemical equations follow the Law of Conservation of Mass
Equation A: Zn +2HCl —> ZnCl2+ 2H2
Equation B: Zn +2HCl —> ZnCl2 + H2
Equation A: Zn +2HCl —> ZnCl2+ 2H2
WILL GIVE BRAINLIEST (major help!!! need now!!!) David observed properties of four different compounds, only one of which is an ionic compound. His observations are shown in the chart.
A 2-column table with 4 rows. The first column labeled compound has entries W, X, Y, Z. The second column labeled observations has entries is a hard solid, melts at 44 degrees C, has a molecular structure; is a brittle solid, does not conduct electricity in water, has a crystal structure; is a hard solid, conducts electricity, has a molecular structure; is a brittle solid, melts at 801 degrees C, has a crystal structure.
Which is most likely the ionic compound?
W
X
Y
Z
Answer:
B. X
Explanation:
Answer:
The answer is D
Explanation:
Wave W is being diffracted, Wave X is being reflected, and waves Y and Z are being refracted.
What are ionic compounds
Which observations is the best evidence that unknown liquid X is a composed of only pure substance
Answer:
A substance that is composed only of atoms having the same atomic number is ... 36 grams of an unknown liquid at its boiling point,.
plzzz helppppppp!!!!!!!!!!!♥️♥️i only have 2 mins to complete this!!!!
Count the number of elements in the following molecule: 3 C2(H6K5)2
Answer:
3 elements
Explanation:
Carbon, helium, and potassium
true or false: Fungi are able to carry out photosynthesis, similar to plants
Answer:
false
Explanation:
Answer:
FALSE ...
Explanation:
However, unlike plants, fungi do not contain the green pigment chlorophyll and therefore are incapable of photosynthesis. That is, they cannot generate their own food — carbohydrates — by using energy from light. This makes them more like animals in terms of their food habits
A bottles contains 3.100 mL of a liquid. The mass of the liquid is 2.060 g. What is the density of the liquid? (BE SURE TO
SHOW ALL THREE PARTS: EQUATION, WORK, AND PROPER FULL ANSWER.
Answer:
0.66 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{2.06}{3.10} \\ = 0.664516..[/tex]
We have the final answer as
0.66 g/mLHope this helps you
1. Which of the following equations is balanced?
a. Al + Br2- 2A1Br3
b. 2Al + 2Br2 → 3AlBr3
c. 2Al + 3Br2 → 2AlBr3
d. Al + Br2 → AlBr3
BRAINLIEST BRAINLIEST
please answer I’m trying to work with 0 hours of sleep :)
What type of compound is this?
Answer:sorry id ont known
Explanation:give m brianlest if you want
How many moles of sodium hydroxide, NaOH, are in a 35.65 g sample of NaOH?
Answer:0.8910 mols of NaOH in a 35.65 g sample of NaOH
Explanation:
Which of the following are examples of chemical energy being released or stored? (2 points)
A boy eating an orange to survive
A car burning gasoline to move
The sun heating a rock
Select two answers