What is the chemical formula of iron (III) sulfide?
A. FeS
B. Fe2S3
C. Fe2(SO3)3

Answers

Answer 1

Answer:

Chemical formula of iron (III) sulfide is Fe₂S₃.

What is chemical formula?

A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

We can write a chemical formula by following steps-

1. Write both the atoms that are present in the chemical compound.

2. Write the valencies of both the atoms that are present in the chemical compound.

3. Now cross multiply both the atoms such that 1 atom's valency goes to the subscript of another atom and vice versa.

Given,

oxidation state of Fe = +3

Valency of Fe = 3

Valency of sulphide ion = 2

When we cross multiply both the atom's valencies we get chemical formula of iron (III) sulfide as Fe₂S₃.

Therefore, chemical formula of iron (III) sulfide is Fe₂S₃.

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Answer 2

Answer: the answer is i think B

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What is the number of proton in chlorine?

a gas at 155 kPa and 298 K occupies a container with an initial volume of 1.00 L. By changing the volume, the pressure of the gas increases to 605 kPa as the temperature is raised to 398 K. What is the new volume?

Answers

Given: P1=155kPa P2=605kPa T1=298K T2=398K V1=1.00L

Unknown: V2=?

Formula: V2= V1P1T2/P2T1

Solution: V2= 1.00Lx155kPax398K/605kPax298K
V2= 61,690/180,290=n
Answer: V2= 0.34L is the new volume

One phosphorus, three chlorine, one oxygen

Answers

Phosphoryl chloride :

POCl3

hope this helps!.

Which gaseous element has the greatest density at stp n2 o2 cl2 f2?

Answers

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, Cl $_2$ is the only gaseous element has the greatest density at STP.

What is density?

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the element ÷volume marked on the graduated cylinder

From formula we can see that density is directly proportional to molar mass of the given element. the increasing order of molar mass is N $_2$ < O $_2$ <F $_2$ <Cl $_2$ . The increasing order of density would be N $_2$ < O $_2$ <F $_2$ <Cl $_2$ .

Therefore, Cl $_2$ is the only gaseous element has the greatest density at STP.

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1 mole Cl2 will have a density of 71/22.4 gram per liter

In general 1 mole of any gas will have a density of (mol.mass)/22.4 gram per liter at STP

Most plastics don't biodegrade

Answers

that is false because every type of plastic can biodegrade

Answer:

What's more, according to Scientific American since [most] plastic isn't biodegradable, it ends up either in landfills or as litter on the landscape and in waterways and the ocean. Some plastics - PVD and PVC as well as Saran coatings and certain inks - even release toxins into our soil and water table

Explanation:

Boron occurs naturally as two isotopes. What is the difference between these isotopes?

Answers

Answer: The two isotopes of boron differs in mass number rather than atomic number.

Explanation:

Isotopes are defined as the chemical species that have same atomic number but differ in their mass number.

Boron is the 5th element of the periodic table and have 2 naturally occurring isotopes. The isotopes are : B-10 and B-11

For $_5^(10)\textrm{B}$ isotope:

Percentage abundance of this isotope = 20 %

Atomic number = 5

Mass number = 10

For $_5^(11)\textrm{B}$ isotope:

Percentage abundance of this isotope = 80 %

Atomic number = 5

Mass number = 11

Hence, the two isotopes of boron differs in mass number rather than atomic number.

"They have different numbers of neutrons and different mass numbers. Remember mass number is protons plus neutrons. The number of protons for an element will never change, however the number of neutrons can." I took the test, its D

Given: Z = 0.43Y + 12 ; What is Y when Z = 28 ?
Can someone explain this one?