How do you calculate equivalent mass?

How do you calculate equivalent mass?

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.

How do you calculate equivalent moles?

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 formula?

The equivalent weight of an acid or base is the formula weight divided by the number of ions, wither H+ or OH- in the formula. Example: What is the gram equivalent weight of phosphoric acid, H3PO4? Using the formula: Eq = MW / n. Eq = equivalent weight. MW = atomic or molecular weight in g/mol, from periodic table.

What is mass equivalent?

Equivalent mass: The number of parts by mass of a substance that combines with or displaces 1.008 parts by mass of hydrogen or 8.0 parts of oxygen or 35.5 parts of chlorine is called its equivalent mass (EM).

How do you calculate molar equivalent weight?

Equivalent weights may be calculated from molar masses if the chemistry of the substance is well known: 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.

How do you find the molar mass of H3PO4?

For example, a molecule of the compound H3PO4 contains three hydrogen atoms, one phosphorus atom, and four oxygen atoms. The molar mass is obtained by adding up the average atomic masses of these atoms: Molar mass H3PO4 = 3(1.008 g) + 1(30.97 g) + 4(16.00 g) = 97.99 g.

How to convert the mass of an element to a mole?

Converting Grams to Moles 1 For a single element, the molar mass is equivalent to its atomic weight multiplied by the molar mass constant (1 g/mol). 2 For a compound, the molar mass is the sum of the atomic weights of each element in the compound multiplied by the molar… More

How to calculate the number of moles in grams?

To go from moles to grams, multiply by the formula mass. For example if you have 17.0 mol of NaCl, then “17.0 mol” × “58.443 g”/”1 mol” = 994 g It has been found that 1 mol of any gas at STP (Standard Temperature and Pressure = 0 °C and 1 atm) occupies 22.4 L.

How is the molar mass of a substance calculated?

Key Points. A substance’s molar mass is calculated by multiplying its relative atomic mass by the molar mass constant (1 g/mol). The molar mass constant can be used to convert mass to moles. By multiplying a given mass by the molar mass, the amount of moles of the substance can be calculated.

How big is a mole of O 2 molecules?

3) 1 mole of O 2 molecules = 6.022 x 10 23 molecules. 6.022 x 10 23 molecules = 1 mole of oxygen molecules.