Calculate: (a) The percentage of phosphorus in the fertilizer super phosphate Ca(H 2 PO 4 ) 2 correct to 1 decimal point. [At. Wt. H=1, P=31, O=16, Ca=40] (b) Write the empirical formula of C 8 H 18

(a) Molecular weight of Ca(H 2 PO 4 ) 2 = 40 + 2[2(1) + 31 + 4(16)] = 40 + 2[2 + 31 + 64] = 40 + 2[97] = 40 + 194 = 234 g 234 g of Ca(H 2 PO 4 ) 2 contains 62 g of P 100 g of Ca(H 2 PO 4 ) 2 will contain = x 100 = 26.49% = 26.5% Hence, 26.5% phosphorous is present in superphosphate Ca(H 2 PO 4 ) 2 (b) Given, Molecular Formula = C 8 H 18 = (C 4 H 9 )2 Molecular formula = n[Empirical formula] ∴ n = 2 Hence, Empirical formula = C 4 H 9

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Chemistry

Calculate:
(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H₂PO₄)₂ correct to 1 decimal point.
[At. Wt. H=1, P=31, O=16, Ca=40]
(b) Write the empirical formula of C₈H₁₈

Stoichiometry

ICSE 2023

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Chemistry

Calculate:
(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H₂PO₄)₂ correct to 1 decimal point.
[At. Wt. H=1, P=31, O=16, Ca=40]
(b) Write the empirical formula of C₈H₁₈

Stoichiometry

ICSE 2023

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Chemistry

Calculate:(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H2PO4)2 correct to 1 decimal point.[At. Wt. H=1, P=31, O=16, Ca=40](b) Write the empirical formula of C8H18

Stoichiometry

ICSE 2023

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Give reason for the following:(a) Ionisation potential decreases down a group.(b) Ionic compounds do not conduct electricity in solid state.

Answer the following questions with reference to electrorefining of copper:(a) What is the anode made of?(b) What do you observe at the cathode?(c) Write the reaction taking place at the cathode.

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Calculate:
(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H₂PO₄)₂ correct to 1 decimal point.
[At. Wt. H=1, P=31, O=16, Ca=40]
(b) Write the empirical formula of C₈H₁₈

Name the following:
(a) Organic compounds with same molecular formula but different structural formula.
(b) Group of organic compounds where the successive members follow a regular structural pattern, successive compounds differ by a 'CH₂' group.

Give reason for the following:
(a) Ionisation potential decreases down a group.
(b) Ionic compounds do not conduct electricity in solid state.

Answer the following questions with reference to electrorefining of copper:
(a) What is the anode made of?
(b) What do you observe at the cathode?
(c) Write the reaction taking place at the cathode.

Arrange the following according to the instructions given in brackets:
(a) C₂H₂, C₃H₆, CH₄, C₂H₄ (In the increasing order of the molecular weight)
(b) Cu²⁺, Na⁺, Zn²⁺, Ag⁺ (The order of Preferential discharge at the cathode)