Question

(a) Which has more number of atoms 100g of N2 or 100g of NH3?
(b) Calcium carbonate decomposes on heating to form calcium oxide and carbon dioxide.When 10g of calcium carbonate is decomposed completely then 5.6g of calcium oxide is formed. Calculate the mass of carbon dioxide formed. Which law of chemical combinationwill you use in solving this problem? State the law.

(a) Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? Why or why not?
(b) A firecracker is fired and it rises to a height of 1000m. Find the
(i) Velocity by which it was released.
(ii) Time taken by it to reach the highest point. (take g = 9.8 m/s2).

Answer 1

Answer:

a.answer-Conclusion: ∴100g of NH3 has more atoms than 100g of N2 

a.Let m be the mass of the gold bought.

Also, let the acceleration due to gravity at poles and at equator be  gp   and  ge   respectively.

Acceleration due to gravity at poles is slightly greater than that at equator.   

∴  Weight of gold at poles       Wp=mgp 

 Weight of gold at equator       We=mge 

But as      ge<gp     ⟹Wp>We          

Hence the weight of gold is slightly less at equator.

So the friend will not agree with Amit about the weight of gold bought

Explanation:

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