Chapter 1 – Basic Concepts of Chemistry
Assignment 8
Q.1. In the reaction
2A + 4B → 3C + 4D
when 5 moles of A react with 6 moles of B, then
(i) which is the limiting reagent?
(ii) calculate the amount of C formed?
Q.2. Carbon is burnt in air as per following reaction
C + O2 → CO2
Calculate the amount of carbon dioxide that could be produced when
(i) 1 mole of carbon is burnt in air.
(ii) 1 mole of carbon is burnt in 16 g of dioxygen.
(iii) 2 moles of carbon are burnt in 16 g of dioxygen.
Q.3. 50.0 kg of N2(g) and 10.0 kg of H2(g) are mixed to produce NH3(g)
(a) Identify the limiting reagent in this reaction if any.
(b) Calculate the NH3(g) formed.
Q.4. 3.0 g of H2 react with 29.0 g of O2 to yield H2O.
(i) Which is the limiting reactant ?
(ii) Calculate the maximum amount of H2O that can be formed.
(iii) Calculate the amount of one of the reactants which remains unreacted.
Q.5. If 20.0 g of CaCO3 is treated with 35.0 g of HCl, how many grams of CO2 can be produced according to the reaction:
CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
Q.6. Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation :
N2 (g) + 3H2 (g) → 2NH3 (g)
(i) Calculate the volume of ammonia produced if 2.00 × 103 g of dinitrogen reacts with 1.00 × 103 g of dihydrogen at STP.
(ii) Will any of the two reactants remain unreacted ?
(iii) If yes, which one and what would be its mass?
Q.7. Hydrogen gas is prepared in the laboratory by reacting dilute HCl with granulated zinc. Following reaction takes place.
Zn + 2HCl → ZnCl2 + H2
Calculate the volume of hydrogen gas liberated at STP when 73 g of zinc reacts with 73 g of HCl. Atomic mass of Zn = 65.3 u, Cl = 35.5 u.
Online Tuitions & Self-Study Courses for Grade 6 to 12 & JEE / NEET