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3 years ago

A diatomic molecule like O2 is always _ because electrons are shared __.

Chemistry

1 answer:

Lorico [155]3 years ago

3 0

A diatomic molecule like O2 is always no polar because electrons are shared equally.

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Determine the number of moles of the compound and determine the number of each type of atom in each of

VARVARA [1.3K]

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of particles.

<u>For A:</u> 2.12 g of potassium bromide

Given mass of KBr = 2.12 g

Molar mass of KBr = 119 g/mol

Putting values in equation 1, we get:

$\text{Moles of KBr}=\frac{2.12g}{119g/mol}=0.0178mol$

1 mole of potassium bromide contains 1 mole of potassium element and 1 mole of bromide element.

So, 0.0178 moles of potassium bromide will contain $(1\times 0.0178\times 6.022\times 10^{23})=1.07\times 10^{22}$ number of potassium atoms and

<u>For B:</u> 0.1488 g of phosphoric acid

Given mass of phosphoric acid = 0.1488 g

Molar mass of phosphoric acid = 98 g/mol

Putting values in equation 1, we get:

$\text{Moles of phosphoric acid}=\frac{0.1488g}{98g/mol}=0.00152mol$

1 mole of phosphoric acid contains 3 moles of hydrogen element, 1 mole of phosphorus element and 4 moles of oxygen element.

So, 0.00152 moles of phosphoric acid will contain $(3\times 0.00152\times 6.022\times 10^{23})=2.75\times 10^{21}$ number of hydrogen atoms, $(1\times 0.00152\times 6.022\times 10^{23})=9.15\times 10^{20}$ of phosphorus atoms and $(4\times 0.00152\times 6.022\times 10^{23})=3.66\times 10^{21}$ number of oxygen atoms.

<u>For C:</u> 23 kg of calcium carbonate

Given mass of calcium carbonate = 23 kg = 23000 g (Conversion factor: 1 kg = 1000 g)

Molar mass of calcium carbonate = 100 g/mol

Putting values in equation 1, we get:

$\text{Moles of calcium carbonate}=\frac{23000g}{100g/mol}=230mol$

1 mole of calcium carbonate contains 1 mole of calcium element, 1 mole of carbon element and 3 moles of oxygen element.

So, 230 moles of calcium carbonate will contain $(1\times 230\times 6.022\times 10^{23})=1.38\times 10^{26}$ number of calcium atoms,

<u>For D:</u> 78.452 g of aluminium sulfate

Given mass of aluminium sulfate = 78.452 g

Molar mass of aluminium sulfate = 342.15 g/mol

Putting values in equation 1, we get:

$\text{Moles of aluminium sulfate}=\frac{78.452g}{342.15g/mol}=0.229mol$

1 mole of aluminium sulfate contains 2 moles of aluminium element, 3 moles of sulfur element and 12 moles of oxygen element.

So, 0.229 moles of aluminium sulfate will contain $(2\times 0.229\times 6.022\times 10^{23})=2.76\times 10^{23}$ number of aluminium atoms, $(3\times 0.229\times 6.022\times 10^{23})=4.14\times 10^{23}$ of sulfur atoms and $(12\times 0.229\times 6.022\times 10^{23})=1.65\times 10^{24}$ number of oxygen atoms.

<u>For E:</u> 0.1250 mg of caffeine

Given mass of caffeine = 0.1250 mg = $0.125\times 10^{-3}$ g (Conversion factor: 1 g = 1000 mg)

Molar mass of caffeine = 194.2 g/mol

Putting values in equation 1, we get:

$\text{Moles of caffeine}=\frac{0.125\times 10^{-3}g}{194.2g/mol}=6.44\times 10^{-7}mol$

1 mole of caffeine contains 8 moles of carbon element, 10 moles of hydrogen element, 4 moles of nitrogen element and 2 moles of oxygen element.

So, $6.44\times 10^{-7}$ moles of caffeine will contain $(8\times 6.44\times 10^{-7}\times 6.022\times 10^{23})=3.10\times 10^{18}$ number of carbon atoms, $(10\times 6.44\times 10^{-7}\times 6.022\times 10^{23})=3.88\times 10^{18}$ of hydrogen atoms, $(4\times 6.44\times 10^{-7}\times 6.022\times 10^{23})=1.55\times 10^{18}$ of nitrogen atoms and $(2\times 6.44\times 10^{-7}\times 6.022\times 10^{23})=7.76\times 10^{17}$ number of oxygen atoms.

3 0

3 years ago

Read 2 more answers

Fast, slow, why do some reactions occur faster than others?

Liula [17]

Answer:

When the concentration of a reactant increases, there will be more chemical present. Due to more reactant particles moving together, more collisions are allowed to happen and with that, the rate of the reaction is increased. So, the higher the concentration of reactants, the faster the reaction rate will be.

Hope this helped you! :)

3 0

3 years ago

What substance is produced by the reaction: H+[aq]+OH-[aq]=?

valkas [14]

Answer:

It produces water.

Explanation:

H+ + OH- produces H2O.

It is a type of Neutralization reaction.

6 0

3 years ago

What are independant variables

Phoenix [80]

Answer:

a variable (often denoted by x ) whose variation does not depend on that of another.

Explanation:

8 0

3 years ago

The element lithium (Li) has 3 protons and 3 electrons. The element fluorine (F) has 9 protons and 9 electrons. An atom of the e

Naddik [55]

When an atom of the element lithium (Li) transfers an electron to an atom of the element fluorine (F), then the bond results between the atoms is ionic bond.

<h3>what is chemical bond? </h3>

A chemical bond is defined as the bond which holds atoms together in molecules.

Bonds arise due to the electrostatic forces present between positively charged atomic nuclei and negatively charged electrons.

<h3>Types of chemical bond</h3>

Ionic bond
Covalent bond
Coordinate bond

<h3>What is Ionic bond ? </h3>

Ionic bond is defined as the transfer of electron from one atom to another atom.

Since, electron transfer from lithium to fluroine. Thus lithium get positive charge and fluorine occupy negative charge.

Thus, the bond form between lithium atom and fluorine atom is ionic bond.

learn more about ionic bond:

brainly.com/question/977324

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8 0

1 year ago

A diatomic molecule like O2 is always _____ because electrons are shared ______.

A diatomic molecule like O2 is always _ because electrons are shared __.