Question

Q1. Write down the 3 formulas of no. of moles.
Q2. Define molar mass.
Q3. State the law of conservation of mass.
Q4. State the law of definite proportions.
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Answer 1

Answer:

The 3 formulas of no. of  moles are:

1. No. of moles = Given Mass / Molar mass

2. No. of moles = Given no. of particles / Avogadro Number

3. No. of particles = (Given Mass / Molar mass) * Avogadro No.

Molar mass is the mass of 1 mole of a substance.

The law of conservation of Mass states that, 'during a chemcical reaction, the sum of the masses of the reactants and products remains unchanged.' Means that mass can neither be created nor destroyed in a chemical reaction.

The law of  definite proportions states that, 'in a pure chemical compound, elements are always present in a definite proportion by mass.'  

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Answer 2

Answer:

q3. law of conservation of mass:

The mass in an isolated system can either be created nor be destroyed but can be transformed from one firm to another form

q4. Law of definite proportions states that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements

q1. i) Number of moles= Mass of substance/Mass of one mole

ii) Number of moles =Mass of given substance / gram molecular weight

iii) Number of moles =mass of substance/moles x relative formula mass

q4 is given as photo