H3PO2→PH3+H3PO3. The equivalent mass of H3PO2 is (m = molecular mass of H3PO2)
What is the formula of equivalent mass?
The equivalent masses of acids, bases, and salts are calculated as follows: Equivalent mass of an acid = molecular mass of the acid/basicity. Equivalent mass of a base = molecular mass of the base/acidity. Equivalent mass of a salt = molecular mass of the salt/total positive valency of metal atoms.
How do you find the equivalent mass of an element in a reaction?
To calculate the equivalent mass of a base, simply divide the molar mass of the base by the number of hydroxyl groups. Take, for example, calcium hydroxide Ca(OH)₂. A few simple calculations yield an equivalent of 37g/mol. To find the equivalent of an acid, divide the acid’s molar mass by the number of protons.
What is N factor in disproportionation reaction?
The n-factor of a compound in a reaction gives the number of moles of electron lost or gained by it (during oxidation and reduction respectively) per mole of the given compound. In a disproportionation reaction, the compound undergoing both the oxidation and reduction is the same.
What happens in a disproportionation reaction?
Disproportionation reaction, also sometimes called dismutation reaction, is basically a type of redox reaction involving simultaneous reduction and oxidation of atoms of the same element from one oxidation state (OS) to two different oxidation states.
What is equivalent mass with example?
The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. These values correspond to the atomic weight divided by the usual valence; for oxygen as example that is 16.0 g / 2 = 8.0 g. ).
What is the unit of equivalent mass?
The unit of equivalent weight is the atomic mass unit; the amount of a substance in grams numerically equal to the equivalent weight is called a gram equivalent. Hydrogen has atomic weight 1.008 (rounded to three decimal places) and always assumes valence 1 in compounds, so its equivalent weight is 1.008.
What is the meaning of equivalent mass?
Solution : The equivalent mass of an element, compound or ion is the number of parts of mass of an element which combines with or displaces 1.008 parts of hydrogen or 8 parts of oxygen or 35.5 parts of chlorine.
Why is the equivalent mass determined and not molar mass?
1. The equivalent mass is the mass of an acid such that when dissociated will yield one mole of hydrogen ions. We determine equivalent mass and not molecular mass because some acids have more available hydrogen ions than others.
What is the difference between equivalent mass and molar mass?
The concept of equivalent weight has been displaced by that of molar mass, which is the mass of one mole of a substance. The equivalent weight of an element is its gram atomic weight divided by its valence (combining power).
Is valency factor and n factor same?
Hint: We need to remember that the valency factor or conversion factor is the n factor. The calculation of valency factor depends upon the type of reactant which we are using to find the n factor. For non-redox reactions, n factor of a substance is equal to the product of displaced mole and charge of the product.
How do you calculate disproportionation reaction?
Hint: A disproportionation reaction is when a substance is both oxidised and reduced forming different products. Check for the oxidation number of the elements in compounds and compare them on both sides.
| Elements | Before | After |
|---|---|---|
| N | +4 | +3,+5 |
| H | +1 | +1 |
| O | 0 | -2 |
What is equivalent mass of KMnO4?
31.6
The equivalent weight of KMnO4 in acidic medium is 31.6 .
What is equivalent mass of NaOH?
40g/mol
Hence, the equivalent weight of NaOH is 40g/mol.
What is equivalent mass of HCl?
Quote from video: Похожие запросы
How do you calculate equivalent?
Equivalent units. are calculated by multiplying the number of physical (or actual) units on hand by the percentage of completion of the units. If the physical units are 100 percent complete, equivalent units will be the same as the physical units.
What is equivalent mass in physics?
The equivalent weight of any substance is the mass of the substance in grams that combines with or is chemically equivalent to eight grams of oxygen or one gram of hydrogen. In other words, it is equal to the mass of the substance in grams that would react with or replace one gram of hydrogen.
How do you calculate the number of equivalents?
To calculate molar equivalents for each reagent, divide the moles of that reagent by the moles of the limiting reagent: Note that the molar equivalency of sodium benzoate is 1. This is because sodium benzoate is the limiting reagent. Any reagents used in excess will have a molar equivalency greater than one.
What is equivalent mass of KMnO4?
31.6
The equivalent weight of KMnO4 in acidic medium is 31.6 .
What is the equivalent mass of HCl?
85.1g
Now equivalent mass is given as the molecular weight divided by the n-factor. Therefore, the equivalent mass of HCl is 85.1g.
What is the equivalent weight of K2Cr2O7?
Expert-verified answer
Equivalent weight of K2Cr2O7 is 49 g/mol. Here, 6 e- participate in the reaction, hence chemical equivalent is 6. Equivalent weight of K2Cr2O7 in acidic medium is 49 g/mol.