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castortr0y [4]
3 years ago
11

An unknown gas effuses 1.66 times more rapidly than CO2. What is the molar mass of the unknown gas, given that the molar mass of

CO2 is 44 grams?
Chemistry
2 answers:
Y_Kistochka [10]3 years ago
4 0
The molar mass is 16.0 grams 
Soloha48 [4]3 years ago
3 0
To determine the molar mass of the unknown gas, we use Graham's Law of effusion which relates the rate of the gases with their respective molar masses. We calculate as follows:

r1 / r2 = √(M2 / M1 )

We let 1 represent the unknown gas and 2 the carbon dioxide.

r1 / r2 = 1.66 = √(44.01 / M1 )
M1  = 15.97 g/mol
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Which of the following pairs of elements is most likely to form an ionic compound?
dmitriy555 [2]

Answer:

The correct option is B.

Explanation:

Ionic bond are usually formed between a metal and a non metal. The metal usually acts as the electron donor while the non metal acts as the electron acceptor, that is, the metal give away electrons while the non metal accept the electrons. In the options given in this question, it is only the pairs in option B, that is qualify for ionic bond, this is because it consist of a metal and a non metal.

5 0
3 years ago
Help anyone can help me do this question,I will mark brainlest.​
Vika [28.1K]

Explanation:

NA2SO3

Combination of these three elements forms following compounds.

And the compound that's going to be formed,depends on the ratio of available oxygen and sulphur.

Depends on the ratio of sulfur to oxygen...

sodium sulfate, Na2SO4

sodium sulfite, Na2SO3

sodium thiosulfate, Na2S2O3

ionic bond is present in between SO3 -2 and Na+2

structure of SO3 -2 [take - sign as delta - which here indicates,partial formal charge of oxygen] (image below)

Here,The oxygen is more electronegative.So,2 oxygen atoms drag one Electron from sulphur atom,leaving behind the formal charge of -1 on two oxygen atoms.

The third oxygen forms covalent bond by sharing 2 electrons. (Actually this ion has resonance structure)

This sulphite ion combines with two sodium ions to form two ionic bonds.This happens when sodium, being an alkali metal dontes it's valence electron to oxygen.

SO2

In Sulphur dioxide, Sulphur is bonded to 2 oxygen atoms. Oxygen is more electronegative than Sulphur and thus, shows a fixed valency of 2. As a result each oxygen forms two bonds with the Sulphur atom making its valency 4.

NAHSO4

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Questions & Answers

CBSE

Chemistry

Grade 11

Oxidation State or Oxidation Number

Question

Answers

Related Questions

The oxidation state of sulphur in NaHSO4 ?

A) 0

B) + 2

C) −2

D) + 4

E) + 6

Answer

VerifiedVerified

72.9K+ Views

Hint: The oxidation state is defined as the charge on the atom. The sum of the oxidation state of an atom in a molecule is equal to the charge on the molecule. The neutral molecules charge less species. It has zero charges.

Complete Solution :

- The oxidation number of an atom is defined as the charge on an atom that appears on the atom on forming an ionic bond. An atom which has higher electronegativity has a negative oxidation state and more electropositive elements have positive oxidation state.

- We are interested in determining the oxidation state of an atom in a molecule. We know that the net charge on a neutral atom or molecule is always equal to zero. Let’s determine the oxidation state of S in the NaHSO4 .

- The oxidation number of alkali metal that is a sodium atom is equal to +1 . Similarly the hydrogen has an +1 oxidation state. Oxygen is an electronegative element. It has an −2 oxidation state. The oxidation states are as listed below:

Element Oxidation state

Na +1

H +1

O −2

We know that the sum of the oxidation state of an atom in a neutral molecule is equal to zero. Then we have,

0 = O.S. of Na + O.S. of H + O.S. of S + 4(O.S. of O)

Let’s substitute the values of oxidation state .we have,

0 = 1 + 1 + O.S. of S + 4(−2)⇒O.S. of S= 8−2 = +6

Therefore the oxidation state of sulphur in NaHSO4 is equal to +6 . So, the correct answer is “Option E”.

H2S

Valency of sulphur is 2 in H2S

5 0
3 years ago
A sample of rest of the following composition 51.85 g of iron 22.22 g of oxygen 16.67 g of water
valentinak56 [21]

Answer:

To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C9H8O4. It is convenient to consider 1 mol of C9H8O4 and use its molar mass (180.159 g/mole, determined from the chemical formula) to calculate the percentages of each of its elements:

%

C

9

mol C

×

molar mass C

molar mass

C

9

H

18

O

4

×

100

=

9

×

12.01

g/mol

180.159

g/mol

×

100

=

108.09

g/mol

180.159

g/mol

×

100

%

C

60.00

%

C

3 0
2 years ago
The two methods of dating rocks and fossils are called​
FrozenT [24]

They are relative dating and absolute dating. I hope it help.

4 0
3 years ago
An isotope undergoes radioactive decay. The new isotope that forms has an atomic number that is 2 less than the original isotope
Olin [163]
The answer is alpha decay, because alpha particles have two protons and two neutrons.  If the isotope has an atomic number two less than the original, it lost two protons, the same amount as in an alpha particle.
4 0
3 years ago
Read 2 more answers
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