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Yogita Ingle 7 years, 5 months ago
The law of conservation of mass states that the mass of a closed system will remain constant in a chemical reaction. In other words, mass can neither be created nor destroyed in a chemical reaction. This law was first formulated by Antoine Laurent Lavoisier in 1789.
For example: When 100g of mercuric oxide is heated, 92.6 g of mercury and 7.4 g of oxygen are obtained as products.
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Yogita Ingle 7 years, 5 months ago
Work done W = F.S
where F is the force applied and S the displacement. Both have magnitude and direction.
W = FS cos θ,
where F and S are magnitudes of force and displacement and θ is the angle between F and S.
Work done is the component of force in the direction of displacement. Work done is the change in the initial and final energies of an object. Energy has onlty magnitude and hence work done also has only magnitude.
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Yogita Ingle 7 years, 5 months ago
Osmosis can be defined as the movement of water molecules from higher water concentration area to the area of less water concentration through a semipermeable membrane. In other words, it can be defined as the diffusion of water molecules through a semipermeable membrane. It is a special case of diffusion of water (High to low). For example, water in the roots of plants is transported through osmosis.
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Yogita Ingle 7 years, 5 months ago
The molecular mass of a substance is relative mass of its molecules as compared with mass of C-12 atom taken as 12 units.
or
The molecular mass is equal to sum of its atomic masses of all the atoms present in one molecule of substance.
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Sany Roy 7 years, 5 months ago
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