Some Basic Concepts of Chemistry
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1.4. 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.
1.4. 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.
1.4 In order to answer the question, we need to know the balanced equation for the combustion of carbon in dioxygen/air, which can be written as:
C (s) + O2 (g) à CO2 (g)
(i) We can see from the above equation,
1 mole of carbon reacts with 1 mole of oxygen to produce 1 mol of carbon dioxide.
In air, c
Upvote 
1.3. Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1 % dioxygen by mass.
1.3. Determine the empirical formula of an oxide of iron, which has 69.9% iron and 30.1 % dioxygen by mass.
1.3 We are given that the percentage of iron by mass is 69.9% and the percentage of oxygen by mass is 30.1%.
Since we have relative moles of both elements, we can calculate the simpler molar ratio of iron to oxygen
= 1.25: 1.88
Divide by the smaller value to both
= 1.25/1.25: 1.88/1.25
= 1: 1.5
= 2: 3
So,
Upvote 1.2. Calculate the mass percent of different elements present in sodium sulphate (Na2SO4).
1.2. Calculate the mass percent of different elements present in sodium sulphate (Na2SO4).
1.2 Molar mass of Na2SO4= (2 x Atomic mass of Sodium) + Atomic mass of Sulphur + (4 x Atomic mass of Oxygen)
= (2x 23) + 32 + (4x 16)
= 46 + 32 + 64
= 142 g/mol
Upvote 1.1. Calculate the molecular mass of the following:
(i) H2O (ii) CO2 (iii) CH4
1.1. Calculate the molecular mass of the following:
(i) H2O (ii) CO2 (iii) CH4
1.1. (i) Molecular mass of H2O = (2x Atomic mass of Hydrogen)+ Atomic mass of Oxygen
Atomic mass of Hydrogen = 1.008 amu
Atomic mass of Oxygen = 16.00 amu
So,
Molecular mass of H2O = 2 (1.008 amu) + 16.00 amu =18.016 amu
(ii) Molecular mass of CO2 = Atomic mass of Carbon + (2x Atomic mass of
Upvote