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1. What is the concept of mole in chemistry?
Ans. The concept of mole in chemistry is a unit that is used to measure the amount of a substance. It is defined as the amount of a substance that contains as many elementary entities (atoms, molecules, ions, or other particles) as there are atoms in exactly 12 grams of carbon-12.
2. How is the mole concept used in stoichiometry?
Ans. The mole concept is used in stoichiometry to determine the quantitative relationships between reactants and products in chemical reactions. By using the mole ratio from the balanced chemical equation, we can calculate the amount of a substance involved in a reaction and predict the amount of product formed or reactant consumed.
3. How do you convert between moles and grams?
Ans. To convert between moles and grams, you need to know the molar mass of the substance. The molar mass is the mass of one mole of the substance. To convert from moles to grams, multiply the number of moles by the molar mass. To convert from grams to moles, divide the mass by the molar mass.
4. What is Avogadro's number and its significance in the mole concept?
Ans. Avogadro's number is a fundamental constant in chemistry and is approximately equal to 6.022 x 10^23. It represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. Avogadro's number is significant in the mole concept as it allows us to relate the mass of a substance to the number of particles it contains and vice versa.
5. How is the mole concept applied in the calculation of solution concentrations?
Ans. The mole concept is applied in the calculation of solution concentrations through the use of molarity (moles of solute per liter of solution). By knowing the molar mass of the solute and the volume of the solution, we can calculate the number of moles of solute present. Dividing this by the volume of the solution gives us the molarity, which represents the concentration of the solute in the solution.
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