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Molar Mass and Gram Atomic Mass

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Questions and Answers

What is the relationship between the atomic mass of an element and its molar mass?

The atomic mass of an element in u is equal to its molar mass in grams.

How do we find the molar mass of atoms?

To find the molar mass of atoms, we take the atomic mass in u and change the units to grams.

Explain the concept of gram atomic mass with an example.

Gram atomic mass is the mass of 1 mole of atoms of an element, where the numerical value remains the same but the units change from u to g.

How is the molar mass of a molecule calculated?

To calculate the molar mass of a molecule, we keep the numerical value the same as the molecular mass in u, but change the units to grams. Signup and view all the answers

What is the significance of Avogadro's number in chemistry?

Avogadro's number (6.022 × 10^23) is used to relate the number of atoms or molecules to the mass in grams. Signup and view all the answers

How is the mole defined as a counting unit for chemists?

A mole is defined as 6.022 × 10^23 particles (atoms or molecules) of a substance, which is equal to its relative mass in grams. Signup and view all the answers

What is the definition of the Avogadro constant?

The Avogadro constant is defined as the number of atoms in exactly 12 g of carbon-12. Signup and view all the answers

Define molar mass.

Mass of 1 mole of a substance is called its molar mass. Signup and view all the answers

What is the mole?

The mole is the amount of substance that contains the same number of particles as there are atoms in exactly 12 g of carbon-12. Signup and view all the answers

State the law of chemical combination that governs the mass of carbon dioxide formed when carbon is burnt in oxygen.

The law of definite proportions governs the mass of carbon dioxide formed when carbon is burnt in oxygen. Signup and view all the answers

What are polyatomic ions?

Polyatomic ions are ions composed of two or more atoms covalently bonded and carrying a net charge. Signup and view all the answers

Calculate the molar mass of Calcium Carbonate, CaCO3.

The molar mass of CaCO3 is approximately 100.09 g/mol. Signup and view all the answers

Calculate the number of moles if you have 36 g of water (H2O).

2 moles Signup and view all the answers

How many molecules are present in 3 moles of CO2?

1.8 x 10^24 molecules Signup and view all the answers

If you have 0.5 moles of sulfur (S8) atoms, what is the mass?

32g Signup and view all the answers

Calculate the mass of 2.5 moles of ammonia (NH3).

34.5g Signup and view all the answers

How many atoms are there in 2.5 moles of magnesium (Mg)?

1.51 x 10^24 atoms Signup and view all the answers

What is the number of particles in 0.2 moles of potassium chloride (KCl)?

1.2 x 10^23 particles Signup and view all the answers

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