What is the molar mass of sodium carbonate (Na2CO3)?

Answer:

a

Explanation:

a is the 100% correct answer

Answer:

Explanation:

Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g.

Also note that molar mass of a substance is equivalent to Avogadro's number (6.02 X 10^-23)

Hence,

6.02 X 10^-23 molecules of ethane was burned in 58g of ethane

So, 4.10 X 10^24 molecules of ethane will burn in xg of ethane.

Cross multiply:

6.02 X 10^-23x = 58 X 4.10 X 10^24

6.02 X 10^-23x = 2.378 X 10 ^26

Dividing both sides by the coefficient of 'x'

x = 2.378 X 10^26/(6.02X 10^-23)

x = 3.95 X10^48g approximately

x = 4.0 X 10^48g

Or

Mole = number of elementary

particless / Avogadro's number

Where,

No of elementary particles= 4.10 X 10^24 molecules

Avogadro's number= 6.02 x 10^-23

Therefore,

Mole = 4.10 X 10^24/ (6.02 X 10^-23)

= 6.81 X 10^ 46 moles.

But mole = mass / molar mass

Mass = mole x molar mass

where

Molar mass of C4H10 = 12x 4 + 1 x 10= 48+ 10=58g/mol

Mass= 6.81 X 10^46 X 58

= 3.95 X 10^48g approximately

= 4.0 X 10^ 48g.

Thanks

Answer:

there are billions, and more that we haven't yet explored, it is just let the sea only a lot more floaty!

hope this helps

Answer: specie

Explanation:

A specie is the smallest group of organisms with similar characteristics and are capable of living with each other and breeding together freely. They give rise to young ones (offspring) that resembles the parents and can also breed with organisms of same species.

Examples of species include

- a group of lizards

- a group of human beings etc

A species is defined as a group of organisms that can mate

A species is a fundamental unit of biological classification. It comprises individuals that can interbreed and produce fertile offspring, sharing common characteristics. Species diversity is vital to biodiversity and plays a central role in ecology and evolutionary biology studies.

Thus, a species is a group of individual organisms that interbreed and produce fertile, viable offspring. According to this definition, one species is distinguished from another when, in nature, it is not possible for matings between individuals from each species to produce fertile offspring. This reproductive isolation is an important factor in defining species.

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Answer:

[tex]39 ^\circ C[/tex]

Explanation:

Given,

V₁ = 18.5 L

T₁ = 18.5° C = 273 + 18.5 = 291.5 K

V₂ = 19.8 L

T₂ = ?

Pressure is constant

Using ideal gas equation

[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

[tex]\dfrac{18.5}{291.5}=\dfrac{19.8}{T_2}[/tex]

[tex]T_2 = 312 K[/tex]

[tex]T_2 = 312 -273 =39 ^\circ C[/tex]

The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.

Since

V₁ = 18.5 L

T₁ = 18.5° C = 273 + 18.5 = 291.5 K

V₂ = 19.8 L

So here the final temperature should be

V1/T1 = V2/T2

18.5 L/291.5 = 19.8 / T2

So T2 = 312 k

= 312 - 273

= 39 degrees

hence, The temperature when the chamber has a volume of 19.8 L should be considered as the 39 degrees.

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Answer:

20.179

Explanation:

The answer is 20.179 because the element you are talking about is the element  Neon, which has the atomic mass of 20.179.

Final answer:

The hydrologic or water cycle is the term for the movement of water between the ground, atmosphere, and bodies of water. It occurs through processes like evaporation, transpiration, condensation, precipitation, surface runoff, and groundwater flow, primarily driven by solar energy and gravity.

Explanation:

The movement of water between the ground, the atmosphere, and bodies of water is called the hydrologic cycle or water cycle. This cycle describes the continuous movement of water as it is evaporated from surfaces like rivers, lakes, and oceans into the atmosphere, forms clouds, precipitates as rain or snow, and returns to the surface. The cycle is driven by solar energy and gravity, moving water through various states: liquid, solid (ice), and vapor.

Water reaches the atmosphere through evaporation, transpiration (from plants), and sublimation (ice to water vapor). It returns as precipitation and may flow over the land as surface runoff or infiltrate into the ground to become groundwater, which slowly moves and can discharge into other bodies of water or return to the ocean.

Answer:

Mass = 14.64 g

Explanation:

Given data:

Volume of solution = 1.25 L

Molarity of Solution = 0.15 M

Mass of CaF₂ = ?

Solution:

Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.

0.15 M =  number of moles of solute / 1.25 L

number of moles of solute = 0.15 M ×  1.25 L

number of moles of solute = 0.1875 mol/L × L

number of moles of solute = 0.1875 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.1875 mol ×78.07 g/mol

Mass = 14.64 g

The Mass of CaF₂ is 14.64 g. Molarity is the ratio of number of moles over the volume of solution.

Given:

Volume of solution = 1.25 L

Molarity of Solution = 0.15 M

To find:

Mass of CaF₂ = ?

Molarity is used to describe the concentration of solution. It is given by number of moles divided by volume of solution in litres.

Molarity = number of moles of solute / L of solution

We will calculate the number of moles of CaF₂ and then determine the mass by using number of moles.

0.15 M =  Number of moles of solute / 1.25 L

Number of moles of solute = 0.15 M *  1.25 L

Number of moles of solute = 0.1875 mol/L * L

Number of moles of solute = 0.1875 mol

Calculation of mass:

Mass = number of moles / molar mass

Mass = 0.1875 mol *78.07 g/mol

Mass = 14.64 g

Thus, the mass of CaF₂ is 14.64 grams.

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Answer:

1.06M

Explanation:

Given parameters:

Mass of HBr  = 50g

Volume of water  = 600mL

unknown:

Molarity of the solution = ?

Solution:

The molarity of a substance is the number of moles of solute in a volume of solution.

   Mathematically;

             Molarity  = [tex]\frac{number of moles }{volume}[/tex]

Since the number of moles is unknown, let us solve for it;

         Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

               Molar mass of HBr  = 1 + 80  = 81g/mol

    Number of moles  = [tex]\frac{50}{81}[/tex]    = 0.64mole

Convert the volume to liters or dm³;  600mL  =  0.6L or 0.6 dm³

Input the parameters and solve;

            Molarity  = [tex]\frac{0.64}{0.6}[/tex]   = 1.06M

Answer: P=1.63atm

Explanation:

Stp means standard temperature and pressure

Standard temperature =273k

Standard pressure =1atm

Using the formula

P1V1/T1=P2V2/T2

P1= 1atm

V1=5.23L

T1=273k

P2=?

V2=3.45L

T2=293k

Substitute the values

1×5.23/273=p2×3.45/293

Cross multiply

293×1×5.23=p2×3.45×273

1532.39=941.85p2

P2=1532.39/941.85

P2=1.627

P2=1.63atm

Answer:

It's C.

Explanation:

Firstly, the burning of carbon produces C02, a greenhouse gas. As nuclear fission does not produce carbon dioxide, it is not A. The decay of radioactive isotopes is not fission, or spliting into 2 parts.

As fission means to split, it is C.

Answer:

i believe this is the answer The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.

Explanation:

Answer:

A disproportionation redox reaction  

Explanation:

1. Assign an oxidation number to every atom in the equation

[tex]2\stackrel{\hbox{$\mathbf{+4}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2} + 2\stackrel{\hbox{-2}}{\hbox{O}}\stackrel{\hbox{+1}}{\hbox{H}^{-}} \longrightarrow \, (\stackrel{\hbox{$\mathbf{+3}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O }}_{2})^{-} + (\stackrel{\hbox{$\mathbf{+5}$}}{\hbox{N}}\stackrel{\hbox{-2}}{\hbox{O}_{3}})^{-} +\stackrel{\hbox{+1}}{\hbox{H}}_{2}\stackrel{\hbox{-2}}{\hbox{O}}[/tex]

2. Identify the atoms that change their oxidation number

N in NO₂: +4 ⟶ +3 in NO₂⁻

N in NO₂: +4 ⟶ +5 in NO₃⁻

3. Identify the type of change

This is a disproportionation — a reaction in which one substance is simultaneously oxidized and reduced.

Answer:

D

Explanation:

Answer: When a chemical reaction occurs, _____.

a phase change takes place

the physical and chemical properties of the products are different from the reactants

Explanation:

A chemical change is like dynamite exploding or iron rusting. It's an actual change in the chemical makeup resulting in a new product

A chemical reaction results in the production of new substances with physical and chemical properties that are different from the reactants, unlike a physical change which does not alter the molecular structure of the substance.

When a chemical reaction occurs, the physical and chemical properties of the products are different from the reactants. A chemical reaction involves a change in the composition of the substances in question where bonds between atoms are broken and/or formed, resulting in the production of new substances. These new products exhibit different physical and chemical properties such as melting point, color, taste, etc. This is in contrast to a physical change which only affects the appearance or form of a substance without altering its molecular structure. Chemical changes are often more difficult to reverse than physical changes. For example, combining hydrogen and oxygen to produce water is a chemical change because it results in the formation of a new substance with different properties than those of the individual reactants.

Answer:

Coal is layered because it is a type of sedimentary rock

Explanation:

Answer:

7

Explanation:

Answer:

Bromine has 7 valence electrons.

Explanation:

Bromine is in group 7 or 17, so it has 7 valence electrons use the Lewis structure for more help.

Answer:

4.98x10^-3 mole

Explanation:

According to Avogadro's hypothesis, 1 mole of any substance contains 6.02x10^23 atoms. This greatly implies that 1 mole of calcium will also contain 6.02x10^23 atoms.

Now, if 1 mole of calcium contains 6.02x10^23 atoms,

then Xmol of calcium will contain 3x10^21 atoms i.e

Xmol of calcium = 3x10^21/6.02x10^23

Xmol of calcium = 4.98x10^-3mol

Therefore, 4.98x10^-3 mole of calcium contains 3x10^21 atoms

3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.

To convert atoms to moles we need a conversion factor: Avogadro's number. According to Avogadro's number: there are 6.02 × 10²³ calcium atoms in 1 mole of calcium atoms. The number of moles corresponding to 3.00 × 10²¹ atoms of calcium are:

[tex]3.00 \times 10^{21} atoms \times \frac{1 mol}{6.02 \times 10^{23} atoms} = 4.98 \times 10^{-3} mol[/tex]

3.00 × 10²¹ atoms of calcium are equivalent to 4.98 × 10⁻³ moles of calcium atoms.

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Answer:

Explanation:

Answer:number of protons in the nucleus and number of electrons in the different shell                                                                                                    

explained : determine the position in the periodic table. ... Their position is decided by their Atomic Number which is the number of protons in the nucleus of the atom.

Answer:

It is made of atoms that are covalently bonded together.

Explanation:

For example the carbonate ion CO3++.

The carbon and oxygen atoms are held together by covalent bonds.

Answer:

"It is made of atoms that are covalently bonded together." (C)

Explanation:

Polyatomic ion is made of three atoms that are covalently bonded together

Edg. 2020 :)

Answer:

0.06 kg

Explanation:

Given data:

Mass of frisbee = ?

Velocity of frisbee  = 11 m/s

Energy of frisbee = 3.6 j

Solution:

K.E = 1/2 mv²

Now we will put  the values in this formula.

3.6 J = 1/2 m(11m/s)²

3.6 j = 0.5 ×121m²/s² × m

3.6 j = 60.5 m²/s² × m

m = 3.6 j/60.5 m²/s²

m= 0.06 j.m⁻².s²

j = Kg.m².s⁻²

m= 0.06 Kg.m².s⁻² .m⁻².s²

m = 0.06 kg

Answer:

Metal, non-metal , and metaliod

Explanation:

Answer:

metal, nonmetal and metalloid

Explanation:

Answer:

C

Explanation:

You can see in the chemical equation that 7 [tex]O_{2}[/tex] are used up to produce 6[tex]H_{2}O[/tex]

Answer:

V₁  = 10 mL

Explanation:

Given data:

Initial volume of HCl = ?

Initial molarity = 3.0 M

Final molarity = 0.10 M

Final volume = 300.0 mL

Solution:

Formula:

M₁V₁  =  M₂V₂

M₁ = Initial molarity

V₁  =  Initial volume of HCl

M₂ =Final molarity

V₂ = Final volume

Now we will put the values.

3.0 M ×V₁  =  0.10 M×300.0 mL

3.0 M ×V₁  = 30 M.mL

V₁  = 30 M.mL /3.0 M

V₁  = 10 mL

Answer:

Explanation:

10 N right

Answer:

Metals

1) Sodium : It is used in the formation of table salt i. e. sodium chloride.

2) Copper : It is used in the wires of electricity due to better conduction.

3) Silver : It is used in wires and for making jewelry.

4) Aurum: It is used for making jewelry.

Non metals

1) Chlorine : It is used in the production of sodium chloride salt which is used in foods.

2) Flourine : It is used in making toothpaste.

3) Hydrogen : It is used in the formation of acids.

4) Oxygen : It is widely used in the production of steel and plastic.