### Atoms And Molecules Class 10th Science Tamilnadu Board Solution

##### Question 1.When ammonia reacts with hydrogen chloride gas, it produces white fumes of ammonium chloride. The volume occupied by NH3 in glass bulb A is three times more than the volume occupied by HCl in glass bulb B at STP. i) How many moles of ammonia are present in glass bulb A?ii) How many grams of NH4Cl will be formed when the stopper is opened?(Atomic mass of N = 14, H = 1, Cl = 35.5)iii) Which gas will remain after completion of the reaction?iv) Write the chemical reaction involved in this process.Answer:(i) 3 moles(ii) 53.5 grams (14 + 4 + 35.5)(iii) Ammonia ( 2 moles will be remaining )(iv) NH3 + HCl NH4ClExplanation -1 mole of any gas at STP occupies 22.4 litres of volume. So, 1 mole of ammonia occupies 22.4 litres of volume. 67.2 litres (22.4 x 3) of volume is 3 moles of ammonia. 22.4 litres of HCl is 1 mole of HCl. According to reaction ,1 mole of ammonia reacts with 1 mole of HCl to form 1 mole of NH4Cl, which comes out as white fumes.NH3 + HCl NH4ClEven though 3 moles of ammonia is present in bulb, only one 1 mole undergoes reaction with 1 mole of HCl. The other 2 moles of ammonia remain unreacted.Question 2.Nitro glycerine is used as an explosive. The equation for the explosive reaction is4C3H5((NO3))3 12CO2 + 10H2O + 6N2 + O2(l) (g) (l) (g) (g)(Atomic mass of C = 12, H = 1, N = 14, O=16)1. How many moles does the equation show for i) Nitroglycerine ii) gas molecules produced?2. How many moles of gas molecules are obtained from 1 mole of nitroglycerine?3. What is the mass of 1 mole of nitroglycerine?Answer:1. 4 moles of nitroglycerine ; CO2 (12) + N2(6) + O2(1) = 19 moles ofgas molecules are formed.2. 4 moles of nitroglycerine gives 19 moles of gas molecules. So, 1 moleof nitroglycerine gives (19/4) 4.75 moles of gas molecules.3. Gram molecular mass of nitroglycerine is 1 mole of nitroglycerine.So, mass of 1 mole of nitroglycerine is 227 grams.[(3x12)C + (5x1)H + (3x14)N + (9x16)O]Question 3.Sodium bi carbonate breaks down on heating:2NaHCO3 Na2CO3 + H2O + CO2(Atomic mass of Na = 23, C = 12, H = 1, O=16)i) How many moles of sodium bi carbonate are there in the equation?ii) What is the mass of sodium bicarbonate used in this equation?iii) How many moles of carbon dioxide are there in this equation?Answer:(i) Two (coefficient of sodium bi carbonate)(ii) 1 mole of sodium bi carbonate contains 84 grams. Two moles ofsodium bi carbonate contains 168 grams. So, 168 grams of sodium bi carbonate is used in the equation.(iii) 1 mole (coefficient of CO2 )Question 4.40 g of calcium was extracted from 56 g of calcium oxide(Atomic mass of Ca= 40, O=16)i) What mass of oxygen is there in 56 g of calcium oxide?ii) How many moles of oxygen atoms are there in this?iii) How many moles of calcium atoms are there in 40 g of calcium?iv) What mass of calcium will be obtained from 1000 g of calcium oxide?Answer:(i) 16 grams of O(ii) 1 mole of oxygen atoms(iii) 1 mole(iv) 714.38 grams.56 grams of CaO gives 40 grams of Ca. 1000 grams of CaO gives (1000x40)/56 = 714.28 grams of calciumExplanation –CaO Ca + O56 40 161 mole of any compound (or gas in molecular form) contains the mass equal to its gram molecular mass. 1 mole of any element contains the mass equal to its gram atomic mass. So,1 mole of CaO = 40 + 16 = 56 grams1 mole of Ca = 40 grams1 mole of oxygen atoms = 16 grams1 mole of calcium oxide dissociates to form 1 mole of Ca and 1 mole of O atoms.Question 5.How many grams are there in the following?i) 1 mole of chlorine molecule, Cl2ii) 2 moles of sulphur molecules, S8iii) 4 moles of ozone molecules, O3iv) 2 moles of nitrogen molecules, N2Answer:we know that when gases are present in the molecular form, 1 mole of any gas is equal to 6.023 x 1023 molecules of that gas, which is equal to the gram molecular weight of gas in the combined state.(i) 1 mole of chlorine molecules contains 71 grams of Cl2. (2×35.5)(ii) 2 moles of sulphur molecules contain 512 grams of S8. (2×32×8)(iii) 4 moles of ozone molecules contain 192 grams of O3. (4× 16× 3)(iv) 2 moles of nitrogen molecules contain 56 grams of N2. (2× 14× 2)Question 6.Find how many moles of atoms are there in:i) 2 g of nitrogen.ii) 23 g of sodiumiii) 40 g of calcium.iv) 1.4 g of lithiumv) 32 g of sulphur.Answer: We know the formula that Applying the above formula for all cases.(i) (ii) (iii) (iv) (v) PDF FILE TO YOUR EMAIL IMMEDIATELY PURCHASE NOTES & PAPER SOLUTION. @ Rs. 50/- each (GST extra)

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