An organic compound contain 69% carbon and 4.8% hydrogen, the remaining being oxygen. Calculate the masses of carbon dioxide

(D) Helium or nitrogen To prevent rancidification of foods containing fats and oils, the packed food is surrounded by unreactive gas (like helium, nitrogen, etc.). The inert atmosphere thus created prevents...

(C) carbon dioxide only

The correct answer is (a) argon

Molecular mass of CO2 = 12 + 2 x 16 = 44  1mol of CO2 = 44 g  44 g of CO2 contain = 6.022 x 1023 molecules  88 g of CO2 contain...

(d) Acid rain is caused by a chemical reaction that begins when compounds of sulphur dioxide and nitrogen oxide react with molecules in the atmosphere to produce acids.

% of carbon = 12/44* Mass of CO2 formed/Mass of substance taken*100 69=12/44*Mass of CO2 formed/ 0.2*100 Mass of CO2 formed=0.506g % of hydrogen= 2/18* Mass of H2O formed/ Mass of substance taken...

(C) totally different from both carbon and oxygen

(B) constant proportions

(i) Substance X- Calcium Hydroxide. Ca(OH)2(aq) + CO2(g)  → CaCO3(s) H2O (ii) Calcium hydroxide is obtained by reaction of calcium oxide and water. CaO(s) + H2O(l) → Ca(OH)2(aq) + Heat 

(i) Substance X is lime water. Ca(OH)2 + CO2 → CaCO3 + H2O Ca(OH)2  -(Lime water) CO2   -(Carbon dioxide) CaCO3 -(Calcium carbonate) H2O - (Water) (ii) Calcium oxide reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of...