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Ankit Mishra 4 years, 10 months ago
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Posted by Arya Sutar 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
The alkali metals react with dihydrogen at about 673K (lithium at 1073K) and form hydrides.
2M + H2 --> 2M+H-
Posted by Nafia Tarannum 4 years, 11 months ago
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Ojhal Sharma 4 years, 10 months ago
Posted by Jinu ?? 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
Molar mass of sulphur (S) is 32
Molar mass of oxygen (O) is 16
32+4(16) = 32 + 64 = 96
Molar mass of sulphuric acid i.e. SO4 is 96.
Tec Om 4 years, 11 months ago
molecular mass of So4=32+16 x 4
=32+64
96
Posted by Anjali _ 4 years, 11 months ago
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Yogita Ingle 4 years, 11 months ago
lithium iodide is more covalent than lithium chloride because the electronegativity in halogens is in the following sequence F>Cl>Br>I.
Thus flourine is most electronegative while iodine is least in halogens.
Covalent character of bond increases down the group so i.e. F
Therefore lithium iodide is more covalent than lithium chloride.
Posted by Manan Soni ? 4 years, 11 months ago
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Posted by Aadya Singh 4 years, 11 months ago
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? S. S. ? 4 years, 11 months ago
Posted by A@Kash Kumar 4 years, 11 months ago
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Posted by Aadya Singh 4 years, 11 months ago
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? S. S. ? 4 years, 11 months ago
Posted by Aadya Singh 4 years, 11 months ago
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Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Molarity = Number of moles of solute per litre of solution in molar concentration
M = no of moles / volume
Mole = mass/molar mass = 1000/18= 55.56 mol
1l of water = 1000mL = 1Kg
Density = 1000kg/m3
therefore Molarity = 55.56mol/1L = 55.56mol/L
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Given,
Mass of solute, glucose = 36 g
Mass of solvent, water = 250 g
Molar mass of glucose = 180 g/mole
Molality : It is defined as the number of moles of solute present in the one kilogram of solvent.
Formula used :
where,
= mass of solute, glucose
= mass of solvent, water
= molar mass of solute, glucose
Now put all the given values in the above formula, we get
Therefore, the molality of solution is, 0.8 mole/Kg
Posted by Aadya Singh 4 years, 11 months ago
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Ruhi Rao 4 years, 11 months ago
Posted by Aadya Singh 4 years, 3 months ago
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Sia ? 4 years, 3 months ago
|
Molarity |
Molality |
|
Molarity of a given solution is defined as the total number of moles of solute per litre of solution. |
Molality is defined as the total moles of a solute contained in a kilogram of a solvent. |
|
Mathematical expression is M = number of moles of the solute /Volume of solution given in terms of litres. |
Mathematical expression is |
|
Depends on volume of the whole solution. |
Depends on the mass of the solvent. |
|
Unit sign expressed as (M). |
Unit sign expressed as (m). |
|
Molarity has a unit of moles/liter. |
Molality has units of moles/kg. |
Posted by Aadya Singh 4 years, 11 months ago
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Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Molarity
It is one of the most widely used unit of concentration and is denoted by M. It is defined as no. of moles of solute present in 1 liter of solution. Thus,
Molarity = No. of moles of solute / Volume of solution(in Litres)
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Normality in chemistry is one of the expressions used to measure the concentration of a solution. It is abbreviated as ‘N’ and is sometimes referred to as the equivalent concentration of a solution. It is mainly used as a measure of reactive species in a solution and during titration reactions or particularly in situations involving acid-base chemistry.
As per the standard definition, normality is described as the number of gram or mole equivalents of solute present in one litre of a solution. When we say equivalent, it is the number of moles of reactive units in a compound.
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
- Parts per million can be defined as the ratio of number of parts of the component to the total number of parts of all components of the solution multiplied by 106.
- It is denoted by ppm.
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Mass per cent is a way of expressing a concentration or describing the component in a particular mixture. The solution composition can be described in mass percentage which shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles. For a solution, the mass per cent is described as the grams of solute per grams of solution, multiplied by 100 to get the percentage.
Mass per cent Formula
The Mass per cent formula is expressed as solving for the molar mass also for the mass of each element in 1 mole of the compound. You can determine the mass percentage of each element with these masses.
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
Mass by volume percentage
- Mass by volume percentage can be defined as the mass of solute dissolved in 100 mL of the solution.
- For instance, mass by volume percent of a solution with 1 g of solute dissolved in 100 mL of solution will be 1% or 1% (mass/volume).
- Mathematically, Mass by volume% =
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
The reactant which reacts completely in the reaction is called limiting reactant or limiting reagent.
The reactant which is not consumed completely in the reaction is called excess reactant .
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
CH4 + 2O2 -> CO2 + 2H2O
GRAM MOLECULAR MASS OF CO2 = 12 +2(16) = 44g
From the reaction it is clear that 1 mole of methane on complete combustion produces 44g (1 mole) of carbon dioxide.
therefore moles of CH4 required to produce 22g of CO2 are:
(22) * (1/44) = 1/2 moles
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
- The word ‘stoichiometry’ is derived from two Greek words - stoicheion (meaning element) and metron (meaning measure).
- Stoichiometry deals with the calculation of masses (sometimes volumes also) of the reactants and the products involved in a chemical reaction.
- This is done using balance chemical equation.
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
This method is also called trial and error method, or inspection method. In this method, coefficient before the formulae or symbols of the reactants and products are adjusted in such a way that the total number of atoms of each element only both the sides become equal. This is called material balance, or mass balance. In this method first of all, atoms of the element which appears least in the chemical equation should be balanced. Then, the next one, and so only.
Posted by Aadya Singh 4 years, 11 months ago
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Gaurav Seth 4 years, 11 months ago
A chemical equation has its own limitations. They do not provide information about:
- The physical state of reactants and products Hence, the symbols ‘s’ for solid, ‘l’ for liquid, ‘g’ for gas and ‘vap’ for vapour are added.
- Conditions such as temperature, pressure and catalyst affecting the reaction
- Concentration of reactants and products Hence, in some cases, for dilute ‘dil.’ and for concentrated ‘conc.’ are added.
- The nature of the chemical reaction; whether it is reversible or irreversible reaction.
- Speed of the reaction
- Heat changes accompanying the reaction; whether heat is given out or absorbed
- Time taken for completion of the reaction A reaction may or may not be complete, and the equation does not reveal it.
Posted by Aadya Singh 4 years, 11 months ago
- 1 answers
Gaurav Seth 4 years, 11 months ago
The atomic mass of metal M is 56. Calculate the empirical formula of its oxide containing 70% of M.
<hr />(i) To calculate the percentage of oxygen.
(ii) To calculate the empirical formula of oxide:
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