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Answer:
(a) Newton's first law of motion :- An object remains in the state of motion or rest unless compelled to an external unbalanced force applied in the direction of the object. Eg:- moving a car
Newton's second law of motion :- The rate of momentum is directly proportional to applied unbalanced force in direction of force . Eg:- Riding the bicycle.
Newton's third law of motion :- Every action has an equal and opposite reaction .
(b)
Given mass of MgCl₂ = 285gm
Molar mass of MgCl₂ = 24 + 2(35.5) = 95g/mol
No of moles = 285 / 95 = 3
No of particles = 6.022 × 10²³ × 3 = 18.066 × 10²³
(c) Mole is defined as no of particles which can be molecules , atoms and ions present in 12g of carbon - 12 isotope.
(d)
Molar mass of CaCO₃ = 40 + 12 + 48 = 100g/mol
No of moles = 0.03
Mass of CaCO₃ required = 0.03 × 100
= 3g
Step-by-step explanation:
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