What is the atomic mass of an atom that contains 21 protons, 21 electrons, and 25 neutrons

Answers

Answer 1

44.95591 atomic mass units

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Related Questions

Need help!!!!!!!!!!!!!

Answers

Answer:

density

Explanation:

What is the molar mass of the anhydrous compound? Answer using four significant figures.

36.02 g/mol

120.15 g/mol

156.12 g/mol

Answers

Answer:

120.15

Explanation:

ta edg

Answer:

120.15

Explanation:

edg 2021

. Which laboratory equipment would most likely be used for testing a substance for the presence of monosaccharides? *

Answers

Answer:

Benedict's reagent is the indicator we use to detect monosaccharides. When monosaccharides are mixed with Benedict's and heated, a color ange occurs.

Hope this helps!! :)

in which of the following is the symbol for the ion and the number of electrons it contains given correctly? *

Answers

Answer:Number of electrons that are present in an atom is determined by the electronic configuration of that atom.

If an ion is carrying a positive charge, it means that the atom has lost electrons and if an ion is carrying a negative charge, it means that the atom has gained electrons.

For the given options:

Option A: The atomic number of hydrogen atom is 1 and the electronic configuration for  ion will be:  

Thus, this atom does not have any electrons.

Option B: The atomic number of bromine atom is 35 and the electronic configuration for  ion will be:  

Thus, this atom has 36 electrons.

Option C: The atomic number of aluminium atom is 13 and the electronic configuration for  ion will be:

Explanation:

2. Balance the following equations. If an equation is already balanced, say so in
your answer.
a. Cl2 + Br → Cl + Br2
b. CaO + H20 + Ca(OH)2
C. Na2SO4 + BaCl2 → BaSO4 + NaCl
d. ZnS + 02 → ZnO + SO2
e. Cl2 + KBr → KCl + Br2
f. H2SO4 + NaOH → Na2SO4 + H20

BRAINLIEST BRAINLIEST
Please answer

Answers

A. 2Br+Cl2=2BrCl
B. Is balanced
C. 2 goes in front of NaCl
D. 2ZnS+3O2=2ZnO+2SO2
E. 2 in front of KBr and KCl
F. 2 goes in front of NaOH and H2O
Balance equations calculator on the internet will help with this

An organism is unicellular, reproduces asexually, and lives in a hot hydrothermal vent at the bottom of the ocean. This organism most likely belongs to the kingdom

Answers

The organism belongs in the kingdom of Archaea

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?

13
5
9
4

Answers

Answer:

It has 5 neutrons

Explanation:

The fact that it is a neutral atom tells us that the number of electrons and protons is the same:

The problem tells us there are 4 electrons, thus there are 4 protons.

The average mass of an atom is the sum of the number of protons and the number of neutrons:

Mass = # Protons + # Neutrons

With the above information in mind we can calculate the number of neutrons:

9 amu = 4 Protons + # Neutrons# Neurons = 5 Neutrons

What is a biotic factor

Answers

Answer:

can be described as any living component that affects another organism or shapes the ecosystem.

Explanation:

Biotic components, or biotic factors, can be described as any living component that affects another organism or shapes the ecosystem. This includes both animals that consume other organisms within their ecosystem, and the organism that is being consumed.

Different isotopes are matched with their uses as (i) Co- 60- To treat cancer (ii) U- 238- To produce electricity (iii) I-131- To treat goitre (iv) Na- 24- In agricultural research Which of the below matches are correct? (i) and (ii) (ii) and (iii) (iii) and (iv) (i) and (iii)

Answers

Answer:

I-131- To treat goitre

U- 238- To produce electricity

(ii) (ii) and (iii)

Explanation:

Radioisotopes have various applications in science. These applications may be positive or negative.

I-131- is used to treat goitre. This is a very important medical application of this isotope of iodine.

U-238 is ordinarily non-fissile but can be transformed to Pu-239 and used as a nuclear fuel for electricity generation.

PLEASE HELP IM GOING TO GIVE BRAINLY AND A LOT OF POINTS

Answers

Answer:

1)

a- 0.10 mol

b- 0.078 mol

c- 5454.54 mol

d- 0.160 mol

e- 0.022 mol

2)

a) 3.6 g

b) 14.9 g

c) 5.6 g

d) 39.9 kg

e) 6.8 g

3)

a) 28

b) 40

c) 160

d) 28

e) 249.6

What are the three main compositional layers of the Earth

Answers

Answer:

The Earth is divided into three chemical layers: the Core [Inner Core (D) and Outer Core (C)], the Mantle (B) and the Crust (A).

Explanation:

At 313° K, the volume of a gas is 50.0 ml. At constant pressure, what is the new volume of the
gas if the temperature is decreased to 293°K?

Answers

Answer:

46.80 ml

Explanation:

V1 =50ml

T1 =313K°

T2 = 293K°

V2 =?

V1/T1 =V2/T2

V2=V1*T2/T1

V2=50*293/313

46.80ml

How many molecules are in 1200 g of acrylonitrile (C3H3N), a chemical used in the production of plastic
Help

Answers

Answer: [tex]136.2\times 10^{23}[/tex] molecules

Explanation:

According to avogadro's law, 1 mole of every substance contains avogadro's number of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{1200g}{53.06g/mol}=22.62moles[/tex]

1 mole of acrylonitrile has = [tex]6.023\times 10^{23}[/tex] molecules

Thus 22.62 moles of  acrylonitrile has = [tex]\frac{6.023\times 10^{23}}{1}\times 22.62=136.2\times 10^{23}[/tex] molecules

Taking into account the definition of Avogadro's number, 1.36×10²⁵ molecules of C₃H₃N are in 1200 g.

Avogadro's Number

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Mass molar

The 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.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

This case

In this case, you know the molar mass of the elements is:

C= 12 g/moleN= 14 g/moleH= 1 g/mole

So, the molar mass of the compound C₃H₃N is calculated as:

C₃H₃N= 3× 12 g/mole + 3× 1 g/mole + 14 g/mole

Solving:

C₃H₃N= 53 g/mole

You have 1200 g of C₃H₃N. So, knowing its molar mass, you can calculate the number of moles that contain a mass of 1200 g as:

1200 g×[tex]\frac{1 mole}{53 grams} [/tex]= 22.64 moles

Then you can apply the following rule of three: If by definition of Avogadro's number 1 mole of C₃H₃N contains 6.023×10²³ molecules, 22.64 moles of C₃H₃N contains how many molecules?

amount of molecules of C₃H₃N= (22.64 moles × 6.023×10²³ molecules)÷ 1 mole

amount of molecules of C₃H₃N= 1.36×10²⁵ molecules

Finally, 1.36×10²⁵ molecules of C₃H₃N are in 1200 g.

Learn more about

Avogadro's Number:brainly.com/question/11907018?referrer=searchResultsbrainly.com/question/1445383?referrer=searchResultsbrainly.com/question/1528951?referrer=searchResultsMolar mass:brainly.com/question/12695086?referrer=searchResults

Match the intermolecular force with the physical property that will result

Answers

Answer:

Intermolecular forces are the forces that bind two molecules together. Physical properties are affected by the strength of intermolecular forces. Melting, boiling, and freezing points increase as intermolecular forces increase. Vapor pressure decreases as intermolecular forces increase. Hope this is what your looking for!

Explanation:

Brainliest please?

what is the anwser to this question

Answers

Answer:

The answer is d

Explanation:

Answer:

Nitrogen makes up most of the Earth's atmosphere

Explanation:

Chromium, cobalt, and manganese are three extremely important metals. Are these metals uniformly distributed in the lithosphere? If not, what region of the Earth is the source of these metals?

Answers

Answer:

No.

Explanation:

No, these metals are not uniformly distributed in the lithosphere, they are present some special regions of earth. Chromium ore is found in many places including South Africa, India, Kazakhstan and Turkey. Cobalt ore deposits are present in the regions of Congo, Canada, Australia, Zambia and Brazil. China, Africa, Australia and Gabon are the regions on the earth where manganese metal is present in large quantity.

Can someone Help pls :)

Answers

Answer:

D. I think

Explanation:

Mechanical advantage = load/_______​

Answers

Answer:

Mechanical advantage = load/effort

Explanation:

Mechanical advantage is like a ratio of load to effort and many machines like pulleys depend on this relationship between load and effort for it to work.

Answer:

The formula of mechanical advantage is Load÷effort

Explanation:

Mechanical advantage is the ratio of the load to the effort i.e. MA=Load(L)÷Effort(E)

Consider the reaction
H,01) +energy > H2(g) +%02(g)
Which of the following phrases best describes this reaction?
A Endothermic, absorbing energy
B) Endothermic, releasing energy
C) Exothermic, absorbing energy
D) Exothermic, releasing energy

Answers

The following phrases best describe this reaction : A Endothermic, absorbing energy

Further explanation

Delta H reaction (ΔH) is the amount of heat change between the system and its environment  

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)  

∆H positive (endothermic): energy (heat) is absorbed from the environment to the system

∆H negative (exothermic): energy (heat) released from the system to the environment

Reaction

H₂O(g) + energy ⇒ H₂(g) + 1/2O₂(g)

In this reaction, it is shown that to break the bonds on the H₂O molecule to form H₂ and O₂ molecules will require energy (breaking the bonds requires energy)

This energy is usually called ∆H dissociation⁰

The gas could be which of the following? Select all that apply. Hint: These gases are more dense than air. Nitrogen Neon Argon Carbon Dioxide Helium Hydrogen Propane Carbon Monoxide

Answers

Answer:

nitrogen, oxygen, carbon dioxide, argon, hydrogen, helium

Explanation:

Which type of reaction always has an element and a compound as reactants?
Group of answer choices

A. decomposition

B. single-replacement

C. double-replacement

Answers

Answer:

B. single-replacement

Explanation:

B. Single-replacement

(Science)The low pressure area near Earth’s equator is filled by cool air moving in from ________.

A

Europe and South America
B

the North and South Pole
C

the Prime Meridian
D

the Atlantic and Pacific Ocean

Answers

Answer:

B . the North and South Pole

Explanation:

The equator is also called the doldrum or the region of calms here the winds are moving slowly and consist of warmth and moisture. Thus developing a low-pressure system.  Due to which the cool and dense winds that blow from the poles reach the equator and the warm winds move towards the poles balancing the temperatures in both the regions.  As these regions don't receive most of the sunlight they have high-pressure cells.

Please answer correctly !!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!!!!

Answers

Answer: smart guess i have is c

Explanation:

guessing sorry

define the term osmosis in your OWN words

Answers

Answer:

Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one equalizing the concentrations on each side of the membrane.

Explanation:

What is the chemical formula for zinc (II) phosphate?

Answers

Answer:

Zn^3(PO4)2

Explanation:

thats the formula

The chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.

Zinc (II) phosphate is an inorganic chemical compound that is made up of zinc cations  and phosphate anions .The chemical formula for zinc (II) phosphate is obtained by combining three zinc cations with two phosphate anions to achieve the neutral charge.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

Thus, chemical formula for compound zinc (II) phosphate is Zn₃(PO₄)₂.

Learn more about chemical formula,here:

https://brainly.com/question/32018188

#SPJ6

Above which temperature does the thermal conductivity of water start to fall?

Answers

30 hope this help and can you help me

Answer:

It’s actually 130 degrees Celsius.

Explanation:

help me id.k this. this is so hard...

Answers

Answer:

it's 2:1

ask me if you want explaination also. it is just an mcq that's why i am not giving

thank you

How many significant figures does 0.062400 have?

Answers

It would have 5 figures

Help with questions 9,10,11

Answers

Answer:

B

A

C

Explanation:

The answer is B A C for the questions

Using the model of the periodic table, which two elements pictured have similar chemical properties?

Answers

Answer:

1 and 3

Explanation:

The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.

1 and 3 because they are in the same column and have similar properties. hope this helps :)
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