(i) The empirical formula of an organic compound is C₃H₄N. Its molecular weight is 108. Find the amount of carbon in one mole of the compound. Show all the steps involved. (Atomic weights: C- 12; H- 1; N- 14)

(ii) (a) Mahesh prepared a basic solution X that has a pH 7.
How will the pH of the solution X change on addition of the following:
1. Hydrochloric acid
2. a solution of a base
(b) The atomic number of an element is 15. To which group will this element belong to?

(iii) 8.2 grams of calcium nitrate is decomposed by heating according to the equation
2Ca(NO₃)₂ _____ → 2CaO + 4NO₂ + O₂
Calculate the following:
(a) Volume of nitrogen dioxide obtained at STP
(b) Mass of CaO formed
[Atomic weights: Ca –40 , N—14, O—16]

Solution

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