Oxygen in natural form will be molecular oxygen, O2 Solution – Molar mass of oxygen = 32 g mol –1 = 5.50 mol × 32.0 g mol –1= 176.0 g sulphurĮxample 2- Calculate number of moles present in 64 g of oxygen. Therefore, mass of sulphur (in grams) = molar mass x number of moles Solution – For converting mass into mole and vice versa, we always need the molar mass. Note that if it is not mention atom or molecule before mole, it always means one mole of that substance in its natural form.Įxample 1- How many grams are there in 5.5 mol of sulphur? Quiz – Mole Concept and Stoichiometry – 1Ĭalculation of mass from mole of any fundamental unit like atom, molecule and vice – versa.

Problems based on law of definite proportions or constant composition Law of Definite Proportions / Constant Composition Problems based on Law of Conservation of Mass What is Matter? What is its Characteristics? It is a simple matter of multiplying the moles of the compound by the atoms or ions that make it up.

1 mole = 6.022 x 10 23atoms or molecules or formula units of that substance.ġ mole of water (H 2O)contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.

Equal masses of carbon and magnesium contain different numbers of atoms.Ħ g of carbon contains 6 / 12 moles of carbon = 0.5 molesĦ g of magnesium contains 6 / 24 moles of magnesium =0.25 moles.

It follows that this ratio will be maintained for any number of atoms.

If one carbon atom has a mass of 12 atomic mass units and one magnesium atom has a mass of 24 atomic mass units, then as a magnesium atom is twice as heavy as a carbon atom.

Number of particles = (Given mass / molar mass) x Avogadro number (from 1 and 2).

Number of moles = Given number of particles / Avogadro number.

Magnetic Effects of Electric Current / All about Electro-magnetism.

Human Eyes and Colorful World / Wonder of Light Part – I.

Light – Reflection and Refraction / Wonder of Light Part-II.

Force and Laws of Motion / The Laws of Motion.

How do Organisms Reproduce? / The Life Cycle.

Control and coordination / The Regulators of Life.

LIFE PROCESSES / LIFE’s INTERNAL SECRETS.

Improvement in Food Resources / Quality Food -Quality Life.

Mole from g force