Calculate the percentage by weight of :
(a) C in carbon dioxide
(b) Na in sodium carbonate
(c) Al in aluminium nitride.
[C = 12, O = 16, H = 1, Na = 23, Al = 27, N = 14]

Question

Calculate the percentage by weight of : (a) C in carbon dioxide (b) Na in sodium carbonate (c) Al in aluminium nitride. [C = 12, O = 16, H = 1, Na = 23, Al = 27, N = 14]

KnowledgeBoat · Accepted Answer

(a) Molecular weight of carbon dioxide CO₂ = 12 + (2 x 16) = 12 + 32 = 44 44 g of CO₂ contains 12 g of carbon 100 g of CO₂ contains x 100 = 27.27% of carbon Hence, percentage by weight of C in CO₂ is 27.3% (b) Molecular weight of sodium carbonate Na₂CO₃ = (2 x 23) + 12 + (3 x 16) = 46 + 12 + 48 = 106 106 g of sodium carbonate Na₂CO₃ contains 46 g of sodium 100 g of Na₂CO₃ contains x 100 = 43.39% ≈ 43.4% of sodium. Hence, percentage by weight of sodium in sodium carbonate is 43.4% (c) Molecular weight of Aluminium Nitride = AlN = 27 + 14 = 41 41 g of Aluminium Nitride contains 27 g of Aluminium 100 g of Aluminium Nitride contains x 100 = 65.85% of Aluminium Hence, percentage by weight of Aluminium in Aluminium Nitride is 65.85%

Chemistry

Calculate the percentage by weight of :
(a) C in carbon dioxide
(b) Na in sodium carbonate
(c) Al in aluminium nitride.
[C = 12, O = 16, H = 1, Na = 23, Al = 27, N = 14]

Stoichiometry

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(i) Potassium phosphate [K₃PO₄] or potassium nitrate [KNO₃]
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[K = 39, P = 31, O = 16, N = 14, H = 1]

Chemistry

Calculate the percentage by weight of :(a) C in carbon dioxide(b) Na in sodium carbonate(c) Al in aluminium nitride.[C = 12, O = 16, H = 1, Na = 23, Al = 27, N = 14]

Stoichiometry

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Calculate the percentage by weight of :
(a) C in carbon dioxide
(b) Na in sodium carbonate
(c) Al in aluminium nitride.
[C = 12, O = 16, H = 1, Na = 23, Al = 27, N = 14]

Calculate the percentage of iron in K₃Fe(CN)₆. [K = 39, Fe = 56, C = 12, N = 14]

Calculate the percentage of pure aluminium in 10 kg. of aluminium oxide [Al₂O₃] of 90% purity. [Al = 27, O = 16]

State which of the following are better fertilizers —
(i) Potassium phosphate [K₃PO₄] or potassium nitrate [KNO₃]
(ii) Urea [NH₂CONH₂] or ammonium phosphate [(NH₄)₃PO₄]
[K = 39, P = 31, O = 16, N = 14, H = 1]