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.
sulfuric acid has a molar mass of 98.078(5) g mol−1, and supplies two moles of hydrogen ions per mole of sulfuric acid, so its equivalent weight is 98.078(5) g mol−1/2 eq mol−1 = 49.039(3) g eq−1.
The normality of a solution is the gram equivalent weight of a solute per liter of solution. It may also be called the equivalent concentration. A gram equivalent weight or equivalent is a measure of the reactive capacity of a given chemical species (ion, molecule, etc.).
37 ml of solute/100 ml of solution. Therefore add 8.3 ml of 37% HCL to 1 liter of D5W or NS to create a 0.1N HCL solution. 12M (37% HCL) = 12 moles/L = 12 x 36.5 = 438 g/L = 438 mg/ml. 0.1 M x 36.5 = 3.65 g/L = 3650 mg.
Ex: The molecular mass of oxygen is 32. This means that oxygen is 32 times heavier than 1/12th of the mass of carbon 12. Equivalent mass is defined as the number of parts by mass of the substance which combine or displace 1.008 parts by mass of hydrogen or 8 parts by mass of oxygen or 35.5 parts by mass of chlorine.
The equivalent mass of an element is the mass of the element in grams that combines with 8 grams of oxygen or 1 gram of hydrogen. It means 12 grams of the metal combine with 8 grams of oxygen to give 20 grams (12g+8g=20g) of the oxide.
Equivalent mass of an acid is the number of parts by mass of the acids which contains 1.008 parts by mass of replaceable hydrogen. The equivalent mass of the acid is equal to the number of grams of an acid per mole of available H+ ion: One equivalent mass of an acid ----- one mole H+ ion.
Equivalent weight is weight of 1 equivalent of any substance. It is equal to molar mass divided by N factor. Normality denotes the number of equivalent of a solute in 1 lt of solution.
The Formula of oxalic acid is H2C2O4. 2H2O. Therefore, the equivalent weight of the acid is molecular weight (126 g/mol) divided by n-factor (valency=2)Therefore,126/2 = 6. thus the equivalent weight of oxalic acid is 63.
Equivalent weight. 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 16.0g / 2.
And the answer is that equivalent weight are additive quantity. This means that if the equivalent weight of Na is 23 gram and the equivalent weight of Cl is 35.5 gram. Therefore, the equivalent of NaCl will be equal to equivalent weight of Na + equivalent weight of Cl or, 23+35.5 grams.
The equivalent mass of CaCO3 is 100g/2=50g. Thus,The equivalent mass of Calcium Carbonate is 50g.
The equivalent mass of NaOH is 40 grams. It is according to the formula , Gram molecular weight divided by the 'n' factor.
Normality is defined as the number of equivalent weights (or simply equivalents, eq) of solute dissolved per liter of solution (equivalents/L = N) (Equation 1). Normality is used in place of molarity because often 1 mole of acid does not neutralize 1 mole of base.
Atomic weight of Hydrogen is 1. There are 2 Hydrogen atoms in water molecule. So it is 2. Oxygen atomic weight is 16.0 and adding 2 and 16, we will get 18.18 is the equivalent weight of water.
Equivalent factors are factors used to convert quantities from their original physical units into a common accounting unit for the purpose of aggregating energy sources or assessing contributions” to environmental problems from diverse sources (for example, the contribution of different pollutants to global warming).
equivalent mass of an element is defined as the number of parts by mass of an element which combines with or displaces directly or indirectly. The equivalent mass of Mg is 12 means: i) 12 P/m of magnesium displaces 1.008 P/m of hydrogen from dilute acid.
Key Points
- The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol).
- The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
Equivalent weight is measure of mass proportion of an element, compound or ion in which it combines with the mass of other chemical entities. Mass of one gram equivalent, like its mole counterpart, is equal to mass in gram, which is numerically equal to equivalent weight.
Summary:
- You can make equivalent fractions by multiplying or dividing both top and bottom by the same amount.
- You only multiply or divide, never add or subtract, to get an equivalent fraction.
- Only divide when the top and bottom stay as whole numbers.
factor is the acidity of given Base. As only 1 hydrogen can be replaced in NaOH therefore it's acidity is 1. Now,we can easily find the Equivalent mass(E). Molar mass of NaOH = 23+16+1= 40g.
- Molecular weight of pottasium dichromate(K2Cr2O7) = 294 g.
- X factor in acidic medium = 6.
- Equivalent weight = molecular weight / X factor.
- = 294 / 6.
- = = 49 g.
We assume you are converting between moles HCl and gram. You can view more details on each measurement unit: molecular weight of HCl or grams This compound is also known as Hydrochloric Acid. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles HCl, or 36.46094 grams.
You look up the atomic mass of each of the elements in the formula, multiply it by the number of atoms of that element in the compound and add it to all the others. This gives you the mass, in grams, of one mole of the molecule.
Water consists of one oxygen atom and two hydrogen atoms. This means that the mass of a water molecule is 1g + 1g + 16g = 18 g/ mol. When the number of moles of water is known, one can calculate how many grams of weight this is, by using the molar weight of water.
To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. Example: Find the atomic mass of an isotope of carbon that has 7 neutrons. You can see from the periodic table that carbon has an atomic number of 6, which is its number of protons.
Multiply the element's atomic mass by the number of atoms of that element in the compound. This will give you the relative amount that each element contributes to the compound. For hydrogen chloride, HCl, the molar mass of each element is 1.007 grams per mole for hydrogen and 35.453 grams per mole for chlorine.
Caffeine has a molecular weight of 194. If it contains 28.9% by mass of nitrogen, the number of atoms of nitrogen in one molecule of caffeine is: A .
